I’ve had more arguments about rest times in the last 2 weeks than I’ve had over GLP-1s all last year.

Which to be honest is what I expected THE LEAST.

Rest between sets is that one often neglected training variable the industry has zero financial interest in. There’s no 12-week challenge to sell you, the influencers can’t package a $97 timer protocol out of it, and the supplement companies have nothing riding on how long you stand around between working sets.

Thus, the conversation never got going…

And yet it’s the variable deciding whether your second/third/fourth/etc. set was worth walking back over to the machine for.

So how long should a man with a full calendar and a 35-minute window rest between sets, and how does he keep progressing once he’s already scraped his session down to the bone?

Let’s get into it, since the answers are more useful than either camp yelling about this online currently believes…

Quick note before we start: Everything below assumes you’re training for strength or hypertrophy. If your sessions are built around endurance, conditioning or general athleticism, almost none of this applies, deploy these principles on your hypertrophy/strength workouts only. We’ll cover the endurance/athleticism/conditioning ballpark later.

The Number Conveniently Left Out Of Programs

Below is the working model we’ve found effective, and the one that started every argument in the first place.

Assuming you’re training with genuinely high intensity, this is roughly what your next set looks like as a function of how long you waited:

• 1 minute rest → next set is typically 70% LESS effective

• 1.5 minutes → 40% less effective

• 2 minutes → 20% less effective

• 3 minutes → 10% less effective

• 4 minutes → 5% less effective

• 5+ minutes → next set is fully as effective as the previous one

Two things before anybody screenshots this and starts a war…

First, treat these as coaching numbers built on a gym floor. No trial has ever generated this exact ladder and probably none none ever will.

The true answer moves with your training age, exercise selection, the muscle you’re hitting, the phase you’re running and how hard you took the previous set. Treat the ladder as a calibrated rule of thumb built from a decade of watching men’s second sets fall apart, then bend the ranges around your own body.

Second, and this is the part everyone skips: The ladder only holds IF you’re training hard enough for fatigue to matter in the first place.

If your first set left 4 reps in the tank, your second set doesn’t care much whether you rested 60 seconds or 6 minutes, since barely anything got depleted and there’s nothing waiting to come back.

Which is why the biggest caveat belongs right here upfront: Most men reading this are NOT going to hit that intensity at first. And that’s fine. It takes months of learning what your own limit feels like from the inside (a.k.a. neural adaptation). Until then, take the rest-time question as directional theory..

Rest interval is an incredibly important, but still second-order variable. It only starts mattering once your sets are hard enough to leave a mark, and the folks obsessing over 60 seconds VS 3 minutes are usually the same ones who’ve never taken a set to a place where the number would change anything.

“Less Effective” At What Though?

Fair question, and this is the one we get asked the most…

Two specific things:

1) Expressing the same total amount of force before your nerves fatigue.

2) Achieving the same degree of muscle stimulus.

Notice what’s absent from that list…

Short rest leaves you more tired, sweatier and far more out of breath, and each of these sensations gets mistaken for productivity. The thing that feels harder is doing LESS for you in this case, and this misunderstanding alone costs your more in progress, wasted effort and frustration than not having an “optimal plan” ever will.

And there’s nothing glamorous about the physiology beneath all of this...

A hard set drains phosphocreatine, the fastest energy currency your muscle carries, and floods the tissue with hydrogen ions. Both take MINUTES to clear instead of seconds. Come back too early and your nervous system simply won’t recruit and drive the same high-threshold motor units, which happen to be the fibers with the most growth potential and the exact ones you paid for the whole session to reach.

The data has been lining up behind the very same mechanism for over a decade now.

Trained men putting 3 minutes between sets built more strength on both squat and bench, and more thickness in the quads, than men doing identical training on 1-minute rests [1]. Eight weeks, same exercises, same sets, same reps. The only variable was the clock.

A systematic review across the available trials found no study anywhere showing superior growth from shorter rests [3], and a follow-up review reached the same place: Both work, longer probably wins in trained lifters [4]. The broader rest-interval evidence has pointed this way since at least 2009 [7].

For strength specifically the picture is even less ambiguous [5], and a 2024 Bayesian meta-analysis put a number on the effect, landing on a small hypertrophic benefit above 60 seconds [6].

And now onto the finding that should end the argument:

Researchers compared 1-minute against 5-minute rests and measured myofibrillar protein synthesis directly through muscle biopsies. The 1-minute group achieved a 76% increase over baseline in the hours after training while the 5-minute group got to 152% [2].

And this one will probably surprise you the most:

The short-rest group had the BETTER hormonal response. More testosterone in circulation, exactly as the pump-and-burn crowd predicts. Yet they still built protein at half the rate.

If metabolic stress and a hormone spike were driving muscle growth, the short-rest group should have won it. They got beaten, and it wasn’t even close. Brad Schoenfeld spends a good chunk of Science and Development of Muscle Hypertrophy [14] dismantling that same hormone hypothesis, and this is one of the cleanest nails in the coffin.

“The burn” is a sensation your brain scores as effort while your muscle registers nothing much at all. Growth comes from mechanical tension delivered by fibers still capable of contracting hard, and you cannot deliver that on a nervous system you never properly recovered.

The Math That Doesn’t Math

Now onto the sharpest criticism our “Rest Time Ladder” has received, deserving a proper answer once & for all.

It goes like this: “If 3 sets at 70% effectiveness beat 1 set at 100%, then 210% beats 100%, so short rest wins on arithmetic alone.”

You’re seeing the flaw already, right?

Start with the calculation itself, since it got copied down wrong. The ladder says 1-minute rests leave your next set 70% LESS effective, which puts it at 30% of the first one. Not even close to 70%.

So 3 sets on 1-minute rests gives you 100 + 30 + 30, landing at 160%, against a single fully-rested set at 100%. Two extra sets, two-thirds of the fatigue cost of the session, and 60 percentage points to show for it.

And 160% is the generous reading, since it assumes the load stayed put. It probably didn’t.

That arithmetic also counts work performed while the goal is stimulus received, and those two things trade in completely different currencies. Your muscles care about mechanical tension over kilojoules.

When rest gets cut, the load you can handle drops and your reps drop with it. The biopsy study documented exactly that alongside everything else: volume load fell further in the short-rest condition [2].

So the 3 identical sets you’re picturing never happen. What you get is one set at your best, then two progressively lighter ones with the plates coming off the rack and your rep count sliding down alongside them.

Meanwhile the reps that drive growth live near the end of a set, when recruitment goes maximal and the bar slows to a crawl.

A meta-regression on proximity to failure found that hypertrophy improves as sets are terminated closer to failure, while strength gains held up across a surprisingly wide range of reps-in-reserve [10]. A degraded third set on a lighter load never reaches that territory. At best it makes you breathe hard…but that’s not the point of a strength/hypertrophy session at all.

None of which makes volume worthless. Far from it. Weekly set volume shows a graded dose-response with muscle growth, at roughly 0.37% additional gain per added weekly set [8], and the more recent modelling confirms the relationship while flagging serious diminishing returns as you climb [13].

So our honest verdict on the “210% VS 100%” argument: You can absolutely play with that math. How trained you are, what you selected, what phase you’re in and how much recovery you have available all move the numbers around. There are like 69,420 workable variations sitting inside those ranges.

Extend the ranges to taste, go and test them on yourself, keep what moves your numbers and bin the rest…

No biggie.

Our conclusion on the arithmetic: You can obviously accumulate more work with short rests. Of course you can. What matters is whether you came to the gym to do more “work” or to get better results, and those two goals diverge far faster than most men expect.

So Where Does Your 40 Minutes Go?

This is where the time argument falls apart, and in fact it wouldn’t even come up had everyone run the numbers on their own sessions to check.

“3 minutes of rest on 2 sets eats my whole 35 minutes” sounds true…IN THEORY.

But let’s check it out in practice:

Take a set of 12 reps at a controlled tempo. Roughly 3 seconds per rep across the concentric, the eccentric and the pause, which lands comfortably inside the range where repetition duration stops mattering for growth [11]. That’s about 36 seconds of muscle under load.

A 6-exercise session at 2 sets per exercise gives you 12 working sets. 12 sets at ~35 seconds each is about 7 minutes of your muscles doing anything at all.

Add warm-up sets, setup, walking between stations and adjusting pins, and your net training time in a 40-minute session lands somewhere around 10-20 minutes, whatever rest interval you choose.

Which means your session was always going to be mostly rest anyway.

When your muscles get the level stimulus that matters, at least 2/3rds of your workout will be spent resting, and the only decision on the table is whether that rest is productive or wasted.

Three minutes standing still/walking slowly with your heart rate coming down and your phosphocreatine refilling is productive rest. 90 seconds of pacing while your nervous system is still flat on the floor is wasted rest that also happens to decrease the quality of the set you’re about to walk into.

Cutting the interval buys you back roughly 90 seconds per set, and you pay for each of those seconds with the quality of every set after the first.

Take this away with you: Cutting rest shaves a few minutes off your session and takes a serious bite out of the useful part of it, which will never be longer or shorter than approximately 10-20 minutes anyway.

Which Dial Are You Supposed To Turn?

This is exactly where the men asking smart questions about rest tend to get stuck…

If rest isn’t the dial you turn, what is?

Treat rest as a recovery tool. You don’t chase shorter rests the way you chase heavier weights. Rest gets set by how hard the previous set was and how much time you’ve got, then it gets left alone.

What you progress is at least ONE of these three:

• Total weight (Load) → the total tonnage moved across the session

• Weight per rep (Intensity of the Load) → how heavy each individual rep is

• Time Under Tension (per set) → how long the muscle spends working within a set

If any of those numbers keep going up, no matter how slightly, without your form deteriorating, you’re making progress. That’s the entire test. Binary, unsentimental, and completely indifferent to how you felt about the session.

And if NONE of those three have moved for 2+ weeks straight, at least one of these things are true at once:

• You aren’t making progress

• You probably need a deload

• You want to double-check everything you’re doing OUTSIDE the gym

The third one is where the answer usually hides. Protein intake, sleep quality, alcohol, daily step count, stress load, and whatever your bloodwork has been trying to tell you for a year.

We laid the full outside-the-gym framework out in the Metabolic Priming Manifesto. And if you’ve never pulled a proper panel to check your thyroid, ferritin, testosterone and inflammatory markers, start with the 40 rows your doctor checked and circled nothing.

If your lifts have been stagnating for a month, the reason is almost always a recovery deficit deceiving you as a training shortage, and your stopwatch has nothing to do with any of it.

The 35-40 Minute Workout Week

Allright Folks, enough theory. Below is the flagship, built for a man with 2-4, short windows a week and zero interest in living inside a gym. Sample routines for 2, 3 and 4-day weeks, so pick whichever matches the calendar in front of you.

3-day split. Lower-Upper-Full. 2 sets per exercise. Moderate to high intensity. Average rest ~3 minutes.

LOWER BLAST

• Hack squat 2x12

• Leg extension 2x15

• Hamstring curl 2x15

• Dumbbell Romanian deadlift 2x12

• Calf raises 2x25-30

~est. time: 40 min

UPPER BURN

• Chest-supported machine rows 2x8-10

• Incline machine chest press 2x12-15

• Cable lateral raises 2x12-15

• Machine preacher curls 2x10-12

• Cable overhead extensions 2x12-15

~est. time: 40 min

FULL BODY PUNISHMENT

• Kettlebell clean & press 2x12

• Straight arm lat pulldown 2x8-10

• Lower cable chest flys 2x12-15

• Face pulls 2x20-25

• Cable hammer curls 2x12-15

• Seated cable tricep extensions 2x12-15

~est. time: 45 min (2 min rest is plenty at face pulls)

How to take the sets, and this is what makes the whole thing work:

• First sets taken to 1-2 reps out from failure

• Second sets taken to MECHANICAL failure, meaning you can’t complete one more rep without your form deteriorating

This structure is doing some extremely specific work. Terminating closer to failure buys you more hypertrophy [10], while the failure-versus-non-failure evidence says you don’t need every single set living at the edge to collect it [9]. Here we combine both pieces of evidence.

So the first set builds quality volume with a margin of safety, and the second goes and takes the stimulus. Trained lifters instructed to finish at 0-1 reps in reserve get the adaptations, and they get them without needing 6 sets per movement to do it [16].

Our stance on set counts: Two hard sets executed properly will out-build five sloppy ones in less than half the time, and the men who refuse to believe that are usually the ones who’ve never taken a single set to a place that challenged them. There’s a reason why you see plenty of “regulars” at your gym who’ve been there for years by now and look exactly the same as on 2nd January 2023.

That second set carries a serious fatigue cost though. When trained lifters take a set to failure, lifting velocity drops around 25% 4 minutes later, against roughly 13% at 1 rep in reserve and 8% at 3 [12]. That’s the physiological reason the interval after a failure set needs to be longer, and it’s why “cut it to 90 seconds” falls apart the moment you try it in practice.

Why only 2 sets per exercise? Three reasons stacked on top of each other.

The volume curve has diminishing returns baked into it [13]. The second set collects most of the remaining stimulus once the first has already recruited everything worth recruiting. And a program a busy man completes 3X/week beats a beautiful one he abandons in Month 2.

Schoenfeld’s own consumer program in The M.A.X. Muscle Plan 2.0 [15] leans on the same logic: Concentrated, hard, manageable, repeatable.

We’re not putting most clients on more than 2-3 sets per movement nowadays anyway. And 1 set can work too for experienced trainees who know exactly what REAL intensity feels like from the inside.

Need it within 35 minutes instead of 40-45? Two levers, in this order:

• Cut the last exercise. Every exercise you remove buys back 7-8 minutes, and the final movement of a session is almost always the least important one in it

• Drop isolation rest to 60 seconds while protecting the full interval on your compounds. Lateral raises and face pulls recover far faster than a hack squat does

What you don’t do is shave 90 seconds off everything evenly. That’s how a 40-minute session becomes a 35-minute session that builds nothing.

How Many Days Can You Honestly Commit To?

The split above assumes 3 sessions a week, which happens to be the sweet spot for most men over 40 running businesses, working high stress careers, making high stakes decisions daily with family obligations, business travel, golf trips with the boys and all that good stuff…

Plenty of you don’t have 3 though. A few of you have 2 sessions and a newborn, while others have 4 available and would rather put all of them to work.

So before you’d even consider a split, make that one decision that drives everything else.

Count the days you’ll hit on your WORST week, ignore your best one. Your best week is a fantasy and no program should be built on top of one.

A man who plans for 4 and delivers 2 has a worse year than the man who planned for 2 and delivered 2, occasionally 3, since the second one built everything around a number he could defend when the quarter went sideways.

Then understand the trade you’re making, since your progress or failure depends on this one.

Fewer days means longer individual sessions or lower weekly volume. Pick your poison, since dodging it isn’t on the menu. Weekly set volume shows a graded relationship with both muscle growth and strength [8][13], so the sets have to land somewhere in the week regardless of how you arrange them.

But to serve you some good news, as little as 4 sets/muscle group/week makes up for your MED (Minimum Effective Dose) for hypertrophy.

No need to think in deranged 15-30-set scenarios like bodybuilders in the 70s.

The good news for the 2-day crowd is buried in the frequency data.

In the most recent modelling, frequency showed a clear effect on strength and a negligible one on size once volume was accounted for [13]. Translation: If you’re chasing muscle, how many days you spread the work across matters far less than whether the work gets done at all. If you’re chasing maximal strength, more sessions demonstrably help.

Which gives you a simple rule.

2 days a week → viable for size, slower for strength, sessions run 50-60 minutes, aim for 3 sets on your primary compounds instead of 2

3 days a week → the best ratio of results to life disruption, sessions run 35-50 minutes, typically 2, maximum sets everywhere

4 days a week → best for strength progression and for men with specific lagging areas, sessions run 35-45 minutes, typically 2 sets everywhere

Every template below runs the same rules as the flagship: First set at 1-2 reps in reserve, second set to mechanical failure, ~3 minutes rest on compounds and 60-120 seconds on isolation work.

Warm-ups don’t count as sets. Two or three progressively heavier ramp-up sets on your first compound of the session, then straight in.

The 2-Day Week

Two sessions have to cover the whole body twice, which means more exercises per session and a longer stay in the building. Budget 60-70 minutes here (you’ll probably finish faster after the first ~3 weeks of adaptation) and the split works beautifully. Pretend it fits in 40 and you’ll butcher the back half of every session.

FULL BODY A

• Hack squat or leg press 3x10-12

• Chest-supported machine row 3x8-10

• Incline machine chest press 3x10-12

• Dumbbell Romanian deadlift 2x10-12

• Machine shoulder press 2x10-12

• Lat pulldown 2x10-12

• Cable lateral raises 2x12-15

• Machine preacher curls 2x10-12

• Cable overhead extensions 2x12-15

~est. time: 60-70 min

FULL BODY B

• Leg press or Bulgarian split squat 3x12-15

• Seated cable row 3x10-12

• Flat dumbbell or machine chest press 3x10-12

• Seated hamstring curl 2x12-15

• Leg extension 2x15

• Straight arm lat pulldown 2x12-15

• Lower cable chest flys 2x12-15

• Cable hammer curls 2x12-15

• Calf raises 2x25-30

~est. time: 60-70 min

Note the 3 sets on the first 3 movements of each session.

With only 2 training days, 2 sets everywhere leaves you around 4 direct sets per muscle per week, which lands under the range where the dose-response curve does its best work [8]. Adding a third set to the primary compounds pulls you back into useful territory without much extra clock time, since those sets ride on rest intervals you were already taking.

What we’d tell a client with 2 days: Call it a maintenance split with serious upside, and it beats every 4-day program you’ll abandon in March. Run it without guilt, and move up to 3 days when your calendar opens for real, never on the day any kind of “guilt” kicks in. If you’re a complete beginner/restarter you’ll still make progress INCREDIBLY FAST. It’s insidiously easy to milk early gains even on a 2-day split.

Three Days, Four Ways

This is where it gets fun, since 3 sessions can be arranged in plenty of different ways depending on what you’re chasing. We sampled 4 of these for you:

WAY 1: LOWER-UPPER-FULL → the flagship above. The default split for limited time + moderate frequency schedules, and the one that handles a chaotic week best since missing a session still leaves you having trained everything.

WAY 2: FULL-FULL-FULL → highest frequency per muscle, shortest sessions, best for men who travel and want every session to be self-contained.

FULL BODY 1 (squat emphasis)

• Hack squat 2x10-12

• Seated hamstring curl 2x12-15

• Chest-supported machine row 2x8-10

• Incline machine chest press 2x10-12

• Cable lateral raises 2x12-15

• Machine preacher curls 2x10-12

~est. time: 45 min

FULL BODY 2 (hinge emphasis)

• Dumbbell Romanian deadlift 2x10-12

• Leg extension 2x15

• Lat pulldown 2x10-12

• Machine shoulder press 2x10-12

• Lower cable chest flys 2x12-15

• Rope tricep pushdowns 2x12-15

~est. time: 45 min

FULL BODY 3 (unilateral emphasis)

• Leg press 2x12-15

• Seated cable row 2x10-12

• Flat dumbbell press 2x10-12

• Face pulls 2x20-25

• Cable hammer curls 2x12-15

• Tricep bar overhead extensions 2x12-15

• Calf raises 2x25-30

~est. time: 50 min

WAY 3: PUSH-PULL-LEGS → the classic, and the best of the three for men who like training a muscle group into the ground and want maximum recovery between hits.

PUSH

• Incline machine chest press 2x10-12

• Lower cable chest flys 2x12-15

• Machine shoulder press 2x10-12

• Cable lateral raises 2x12-15

• Cable overhead extensions 2x12-15

• Rope tricep pushdowns 2x12-15

~est. time: 45 min

PULL

• Chest-supported machine rows 2x8-10

• Lat pulldown 2x10-12

• Straight arm lat pulldown 2x12-15

• Face pulls 2x20-25

• Machine preacher curls 2x10-12

• Cable hammer curls 2x12-15

~est. time: 45 min

LEGS

• Hack squat 2x10-12

• Dumbbell Romanian deadlift 2x10-12

• Leg extension 2x15

• Seated hamstring curl 2x15

• Hip abduction machine 2x15-20

• Calf raises 2x25-30

~est. time: 45 min

WAY 4: SWAP THE THIRD DAY FOR A WEAK POINT DAY → keep the first 2 sessions from any pairing above and hand the remaining day entirely to 1-3 lagging muscles. Three pairings worth running:

• Full-Full-Weak Point → best whole-body coverage before the specialization day

• Upper-Lower-Weak Point → best when the lagging muscle sits above your waist

• Push-Pull-Weak Point → best when your legs are already ahead of your torso

This is the single most underrated move available to a man in his 40s with some decent training experience, and we’ll cover how to choose the targets shortly.

WEAK POINT DAY (example: side delts, rear delts and biceps lagging)

• Cable lateral raises 3x12-15

• Machine shoulder press 2x10-12

• Reverse pec deck 3x15-20

• Machine preacher curls 2x10-12

• Cable hammer curls 2x12-15

~est. time: 40 min

The 4-Day Week

Four sessions gives you shorter days, more frequency and room to specialize. Both templates below follow 2 sets per exercise structure and can be comfortably finished in 35-45 minutes.

OPTION 1: UPPER-LOWER-UPPER-LOWER → the highest-return arrangement for strength, since every major lift gets hit twice a week and frequency carries measurable weight for strength adaptations [13].

UPPER A

• Chest-supported machine rows 2x8-10

• Incline machine chest press 2x10-12

• Machine shoulder press 2x10-12

• Cable lateral raises 2x12-15

• Machine preacher curls 2x10-12

~est. time: 40 min

LOWER A

• Hack squat 2x10-12

• Dumbbell Romanian deadlift 2x10-12

• Leg extension 2x15

• Seated hamstring curl 2x15

• Calf raises 2x25-30

~est. time: 40 min

UPPER B

• Lat pulldown 2x10-12

• Flat dumbbell or machine chest press 2x10-12

• Lower cable chest flys 2x12-15

• Face pulls 2x20-25

• Rope tricep pushdowns 2x12-15

~est. time: 40 min

LOWER B

• Leg press 2x12-15

• Bulgarian split squat 2x10-12/leg

• Lying hamstring curl 2x15

• Hip abduction machine 2x15-20

• Standing calf raises 2x20-25

~est. time: 40 min

OPTION 2: PUSH-PULL-PUSH-PULL → our preferred 4-day arrangement, and the one almost nobody runs properly.

The trick is folding the lower body into the pattern instead of parking it on its own day.

Your push days pick up the lower-body pushing muscles (quads, calves), while your pull days collect the hip hinge and everything behind it (hamstrings, glutes). Your legs get trained twice a week without ever having a dedicated leg day, which is a significant gift to a man whose Thursday evenings belong to his kids.

PUSH A

• Hack squat 2x10-12

• Leg extension 2x15

• Incline machine chest press 2x10-12

• Machine shoulder press 2x10-12

• Cable lateral raises 2x12-15

• Rope tricep pushdowns 2x12-15

~est. time: 45 min

PULL A

• Dumbbell Romanian deadlift 2x10-12

• Seated hamstring curl 2x15

• Chest-supported machine rows 2x8-10

• Lat pulldown 2x10-12

• Face pulls 2x20-25

• Machine preacher curls 2x10-12

~est. time: 45 min

PUSH B

• Leg press 2x12-15

• Bulgarian split squat 2x10-12/leg

• Flat machine chest press 2x10-12

• Lower cable chest flys 2x12-15

• Dumbbell lateral raises 2x12-15

• Cable overhead extensions 2x12-15

• Calf raises 2x25-30

~est. time: 50 min

PULL B

• Hip thrust or 45° back extension 2x12-15

• Lying hamstring curl 2x15

• Seated cable row 2x10-12

• Straight arm lat pulldown 2x12-15

• Reverse pec deck 2x15-20

• Cable hammer curls 2x12-15

~est. time: 45 min

And if you’re on a 4 day split with a specific area that’s been lagging behind for a while, swap PULL B or LOWER B for the Weak Point Day and run the specialization for 6-8 weeks before rotating back.

One thing you’ll notice scanning these routines: In the lower-frequency splits, small muscles like calves, rear delts and biceps get typically less direct hits weekly while the big movers get 2 or more. That’s a deliberate allocation rather than an oversight, since the compounds already tax the small stuff heavily and your recovery budget has to go somewhere.

If one of those muscles is the thing holding your physique back, that’s exactly what the Weak Point Day exists for.

Another thing you may have noticed is that we prefer starting with legs and back. Since they are large muscle groups, they squeeze way more energy out of you, and you better allocate your freshly recovered nervous system to getting done with those first while your smaller muscle groups are still indirectly taking a hit.

Our no BS stance on split selection: The arrangement matters far less than most of you might want it to. Total hard sets per muscle per week, taken close enough to failure, with the recovery required to make each one count. Everything above amounts to 9 different dishes for the same 3 ingredients.

Which Muscles Have Earned Their Own Day?

Since 3 of the sample programs hand a full session to lagging muscles, the selection process matters…

Pick 1-3 muscles maximum, and choose them using these filters in order:

• What limits your compounds? If your grip fails before your lats on rows, or your triceps quit before your chest on presses, that’s a weak link taxing every session you do

• What’s flat on the numbers? Pull up 12 months of logs. Whatever hasn’t moved (or moved significantly LESS than the rest) is your answer, and it’s rarely the muscle you assumed

• What do you see in the mirror at 3/4 turn? Side delts and upper back carry a physique at 45, and both are chronically underdone in men who came up on bench and curls

Then apply the one filter that decides whether this works:

Never build a weak point day around a muscle you enjoy training. Biceps are not lagging in a man doing 9 sets of curls a week (assuming he does them correctly and with the right intensity).

The muscles that lag are almost always the ones your ego skips, and the entire point of a dedicated day is facing them while you’re fresh instead of tacking them onto the end of a session you already emptied the tank on.

Run the specialization for 6-8 weeks, then rotate. Chasing one muscle indefinitely relocates the imbalance somewhere else.

The Exceptions, And The One That Should Worry You

A few situations where the standard advice bends…

Heavy compounds and PR attempts. For strength work and especially for true max attempts on squat, bench or deadlift, resting 5-10 minutes is completely legitimate. Powerlifters have been doing it forever for good reason.

Now the diagnostic worth running on yourself:

If you regularly need a full 10 minutes on a non-PR set, the ceiling you keep hitting may live in your engine rather than your muscles. The tissue recovered on schedule while your cardiovascular system took its sweet time catching up. Very fixable, and a completely different thing to fix than the one you assumed you were dealing with.

Nothing here says max weight equals max effectiveness. Heavy and light loads both build muscle when sets get taken close enough to failure [17], which makes the load one lever among several, but NOT something you should take as a religious dogma..

Last but not least, NOTHING here says you need max effectiveness on every single set. Pre-fatiguing a muscle on purpose, running a metabolite-focused block, or deliberately keeping intensity moderate through a brutal work quarter are all defensible choices, and that’s exactly what periodized programs around cycling between exactly these approaches are for.

The ladder tells you what a short rest costs. Paying that cost knowingly, for a reason you could explain out loud, is a completely valid way to train.

Endurance, aerobic and athleticism-focused sessions run on completely different rules. Don’t import any of this into them.

For The Man With Kids, A Packed Calendar And Zero Patience

Time for the part almost every training article on the internet gets wrong…

Most content out there is written for a 22-year-old with a calendar made of open space, one houseplant to keep alive and a mortgage that hasn’t happened to him yet. And a man juggling a company, 3 kids and a 6am flight reads “rest 5 minutes between sets” and correctly concludes the author has never met him.

So let’s be direct about it…

You most likely do NOT need full 5-minute rest times.

The ladder tops out at 5 minutes since that’s where the curve flattens, and a flattening curve gives you a ceiling to work under. At 3 minutes you’re operating at roughly 90% of a fully rested set, and 90% delivered consistently 3X/week for a year is a physique. A theoretical 100% delivered 2X/month, since you could never find the 55 minutes, is nothing at all.

Adjust according to your recovery, goals, workload and available time. That’s the point of bio individuality in everything we write about, but this time it extends to more than just your biology.

Where we land for the over 40+ crowd: The perfect session you can’t fit into your week has an effect size of zero. Build the session around the window you have even on your WORST weeks, then make every set inside it count for something.

Our client Billy, a 48-year-old mortgage loan consultant and single dad of 3, took 8 years off his heart age in 6 months training 3X/week for 40-50 minutes on a basic setup in the corner of his living room.

Our client Jamie, 51, entrepreneur and father of 3, dropped 25 lbs in 5 months while adding 50% to his lifts, on a schedule that never once required him to move a meeting.

None of these men was resting 5 minutes, and both left enough of a gap that the second set counted for something.

And across our initial assessments, the single most common training error we see in men over 40 has nothing to do with the interval.

It’s a man trying to bang out 5-6 sets per exercise on 45-second rests, calling it high volume, with no idea that his sets 3-6 have been more performative than effective for the past 2+ years.

How this translates to our answer to the “Coach, how long should I rest?” question: Long enough that the next set is worth doing, short enough that you finish before your calendar catches you. For most men over 40 training hard, that’s ~3 minutes on compounds and 90-120 seconds on isolation work.

If You’ve Got 35 Minutes Tomorrow

Practical, in the order we’d tackle it:

1. Let the set you finished dictate the clock, and ignore the wall. Hard compound set to near failure gets 2-3 minutes. Isolation work gets 90-120 seconds. A set that left 4 reps in the tank barely needs 60.

2. Cut exercises before you cut rest. A 5-exercise session done properly beats a 10-exercise session done in a hurry, every single time. Almost no one in this space makes that trade, and it’s the single change that fixes the most sessions.

3. Run 2 sets per exercise, first at 1-2 RIR, second to mechanical failure. Stop the second set on the rep before your form breaks, and never 3 reps after or 4 reps before.

4. Log 3 numbers per session and nothing else. Total tonnage, heaviest working weight per exercise, and roughly how long your hardest set lasted. If one of the 3 moves over 2 weeks, you’re progressing.

5. Fill the rest instead of shortening it. Mobility for a muscle you’re not training, setting up your next station, breathing down your heart rate. Standing still is fine too. Scrolling is where the 3 minutes becomes 6.

6. If nothing has moved in 2+ weeks, deload before you troubleshoot the program. One week at roughly 70-80% of your usual volume, then reassess. Most stalls trace back to recovery debt, and almost none of them to your programming.

7. Test the ladder on yourself. Try 3 minutes rest as your standard for a month and log everything, then repeat the same lifts on 90 seconds and compare the two blocks. Your data beats our data (and anyone else’s), since you’re the only person who gets to live in your body.

So How Long Should You Rest Between Sets?

Long enough that your nervous system bothers to show up for the second set…

Deeply unsatisfying to read, and completely correct anyway. Everything above is the arithmetics sitting underneath it.

The men who get this wrong split into two camps.

One camp writes rest off as wasted time, rushes back to the machine while their high-threshold motor units are still flat on the floor, then wonders why the numbers in their notes app haven’t moved since spring. The other takes 5 minutes as gospel, needs 55-75 minutes to finish a session, and stops showing up entirely by Week 6.

Both of them are optimizing the wrong variable. The right one is whether your load, your per-rep intensity or your time under tension keeps climbing, and rest interval is one of several dials feeding those numbers.

If you’re training at the intensity this whole piece assumes, give yourself 2-3 minutes on the hard stuff and stop apologizing for it. Once you feel like you’ve been stagnating for 2+ weeks, audit your sleep and your bloodwork long before you blame your stopwatch. And if you’ve only got 35 minutes, cut an exercise before you cut the recovery that makes the remaining ones work.

Your muscles have no idea how long your workout was. They only know how hard the last set was, and whether you gave them a fighting chance at the next one.

Ready to build a physique that fits inside your calendar instead of the other way around?

We’ve helped 100+ executives, directors, business owners & licensed professionals drop 20-50+ lbs of fat through the Three Pillars of the Demi Cycle Protocol (Time Efficiency, Metabolic Priming & Natural Accountability)

Without counting calories, spending more than 2-3 hours/week in the gym or saying no to

• Family dinners

• Business events

• Your favourite foods & drinks

If something clicked for you reading this, there’s a decent chance we might be a great fit for working together 1-on-1...

Apply Here to Book a Free Strategy Call and let’s see if we’re a great fit for working together 1-on-1.

Until then,

Keep it Lean & Energetic!

Best,

Coach Ábris

Want the full story on what we do? Check it out HERE

💪

More ways we can help you reclaim your body, energy & focus:

Ready to shred fat and restore your energy levels sustainably? Book a free 1-on-1 Strategy Call and discover how our systems can help you achieve a lean & energetic physique without counting calories or spending hours in the gym. We’ll build you a plan that fits your lifestyle and hold you accountable with our tailored 1:1 coaching.

Disclaimer: This piece is for educational purposes only and is not medical advice. Consult with qualified professionals before starting or altering any training program, particularly if you have existing injuries or cardiovascular conditions.

References

1. Schoenfeld BJ, Pope ZK, Benik FM, et al. Longer interset rest periods enhance muscle strength and hypertrophy in resistance-trained men. J Strength Cond Res. 2016;30(7):1805-1812. https://pubmed.ncbi.nlm.nih.gov/26605807/

2. McKendry J, Pérez-López A, McLeod M, et al. Short inter-set rest blunts resistance exercise-induced increases in myofibrillar protein synthesis and intracellular signalling in young males. Exp Physiol. 2016;101(7):866-882. https://pubmed.ncbi.nlm.nih.gov/27126459/

3. Henselmans M, Schoenfeld BJ. The effect of inter-set rest intervals on resistance exercise-induced muscle hypertrophy. Sports Med. 2014;44(12):1635-1643. https://pubmed.ncbi.nlm.nih.gov/25047853/

4. Grgic J, Lazinica B, Mikulic P, Krieger JW, Schoenfeld BJ. The effects of short versus long inter-set rest intervals in resistance training on measures of muscle hypertrophy: A systematic review. Eur J Sport Sci. 2017;17(8):983-993. https://onlinelibrary.wiley.com/doi/10.1080/17461391.2017.1340524

5. Grgic J, Schoenfeld BJ, Skrepnik M, Davies TB, Mikulic P. Effects of rest interval duration in resistance training on measures of muscular strength: A systematic review. Sports Med. 2018. https://pubmed.ncbi.nlm.nih.gov/28933024/

6. Longo AR, et al. Give it a rest: A systematic review with Bayesian meta-analysis on the effect of inter-set rest interval duration on muscle hypertrophy. Front Sports Act Living. 2024. https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2024.1429789/full

7. de Salles BF, Simão R, Miranda F, et al. Rest interval between sets in strength training. Sports Med. 2009;39(9):765-777. https://doi.org/10.2165/11315230-000000000-00000

8. Schoenfeld BJ, Ogborn D, Krieger JW. Dose-response relationship between weekly resistance training volume and increases in muscle mass: A systematic review and meta-analysis. J Sports Sci. 2017;35(11):1073-1082. https://pubmed.ncbi.nlm.nih.gov/27433992/

9. Grgic J, Schoenfeld BJ, Orazem J, Sabol F. Effects of resistance training performed to repetition failure or non-failure on muscular strength and hypertrophy: A systematic review and meta-analysis. J Sport Health Sci. 2022;11(2):202-211. https://pubmed.ncbi.nlm.nih.gov/33497853/

10. Refalo MC, et al. Exploring the dose-response relationship between estimated resistance training proximity to failure, strength gain, and muscle hypertrophy: A series of meta-regressions. Sports Med. 2024. https://pubmed.ncbi.nlm.nih.gov/38970765/

11. Schoenfeld BJ, Ogborn DI, Krieger JW. Effect of repetition duration during resistance training on muscle hypertrophy: A systematic review and meta-analysis. Sports Med. 2015;45(4):577-585. https://pubmed.ncbi.nlm.nih.gov/25601394/

12. Refalo MC, Helms ER, Hamilton DL, Fyfe JJ. Influence of resistance training proximity-to-failure, determined by repetitions-in-reserve, on neuromuscular fatigue in resistance-trained males and females. Sports Med Open. 2023. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9908800/

13. Pelland JC, et al. The resistance training dose response: Meta-regressions exploring the effects of weekly volume and frequency on muscle hypertrophy and strength gains. Sports Med. 2025. https://pubmed.ncbi.nlm.nih.gov/41343037/

14. Schoenfeld BJ. Science and Development of Muscle Hypertrophy. 3rd ed. Human Kinetics. https://us.humankinetics.com/products/science-and-development-of-muscle-hypertrophy-3rd-edition

15. Schoenfeld BJ. The M.A.X. Muscle Plan 2.0. 2nd ed. Human Kinetics. https://us.humankinetics.com/products/the-max-muscle-plan-2-0

16. Ruple BA, Plotkin DL, Smith MA, et al. The effects of resistance training to near failure on strength, hypertrophy, and motor unit adaptations in previously trained adults. Physiol Rep. 2023. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10161210/

17. Schoenfeld BJ, Grgic J, Ogborn D, Krieger JW. Strength and hypertrophy adaptations between low- vs. high-load resistance training: A systematic review and meta-analysis. J Strength Cond Res. 2017;31(12):3508-3523. https://pubmed.ncbi.nlm.nih.gov/28834797/

This time we’re covering something sitting in every grocery store on the planet, and something that turned 6 months of fat loss into 6 months I effortlessly enjoyed.

Back in 2023 I dropped 50 lbs in 6 months, and somewhere around week 3 I developed what I can only describe as an obsession with heat: Cayenne on everything, Tabasco & Sriracha in permanent rotation on the counter, and chili flakes in quantities that alarmed my brother who I was living with at the time, watching me eat all sorts of infernally HOT meals. The obsession never left me, and why it stuck around has as much to do with behaviour as with biochemistry.

We’re talking about Capsaicin (8-methyl-N-vanillyl-6-nonenamide), the pungent compound in Capsicum peppers responsible for every bit of the burn.

Capsaicin occupies a strange spot in this series. Almost every compound we’ve profiled arrives in a capsule, while this one arrives on your plate. Worth knowing though that IF you want the compound without the burn, standardized capsaicin capsules exist and several of the trials below used exactly that format. Either route delivers, and the studies have measured a surprising amount of useful work:

• thermogenesis & resting metabolic rate

• fat oxidation & substrate switching

• brown adipose tissue activation

• appetite & energy intake

• vasodilation & circulation

• pain relief through nerve defunctionalization

• all-cause & cardiovascular mortality

Capsaicin works through a mechanism nothing else in this series shares: It activates a receptor your body built to detect burning heat, which means your nervous system reacts to a chili pepper as though your tissue temperature had climbed. This confusion hands you the metabolic benefits.

There’s a number attached to the fat loss claim though, and once you see it, the entire way you use this compound changes. We’ll do the maths on it later below.

Let’s get into the mechanisms first:

How It Works

Tricking Your Heat Receptors

This is the primary mechanism and every downstream effect traces back to it.

Your sensory neurons carry a receptor called TRPV1 (transient receptor potential vanilloid 1), an ion channel that opens when tissue temperature climbs past roughly 43°C/109.4°F. When it opens, calcium floods into the neuron and your brain receives a signal it interprets as burning.

Capsaicin binds that same receptor and opens the same channel without any temperature change whatsoever. Your mouth reports a burn that isn’t happening.[1]

The part worth pausing on comes next. TRPV1 receptors aren’t confined to your tongue. They line your gastrointestinal tract, sit in your adipose tissue, appear in endothelial cells & populate vascular smooth muscle.

Activating them triggers a cascade that reaches well past the sensation of heat:

→ Sympathetic nervous system activation, releasing catecholamines that mobilize stored fat

→ Increased thermogenesis, raising body heat production and the energy cost of maintaining it

→ Brown adipose tissue recruitment, activating the fat that burns energy as heat instead of storing it

→ Vasodilation, widening blood vessels through nitric oxide and CGRP release

→ Nociceptor defunctionalization with repeated exposure, which underpins the pain applications

Your body treats capsaicin the way it treats being warm. Of course maintaining core temperature costs energy, so does the reaction to a chili pepper.

Raising Your Resting Metabolic Rate

The thermogenic effect shows up consistently across controlled trials, and its size matters far more than its existence.

A 2021 systematic review and meta-analysis by Irandoost et al. pooled 13 placebo-controlled trials and reported that capsaicinoids significantly increased resting metabolic rate by 33.99 kcal/day (95% CI: 15.95-52.03), with the heterogeneity between studies sitting at zero. The same analysis showed significantly reduced respiratory quotient and increased fat oxidation, with capsule formulations taken over longer durations producing the strongest effect on RMR.[1]

A 2018 meta-analysis by Zsiborás et al. examined 9 trials and landed in the same territory: energy expenditure rose by 58.56 kcal/day (p = 0.030) with respiratory quotient dropping by 0.216 (p = 0.031), confirming a shift toward burning fat for fuel.[2]

So the honest range across the two best meta-analyses lands somewhere around 35 to 60 extra calories burned per day.

Hold onto the number. We’ll work out what it’s worth later below.

Waking Up Your Brown Fat

Most of your body fat is white adipose tissue, which stores energy. A much smaller amount is brown adipose tissue (BAT), which burns energy directly to produce heat through a protein called UCP1.

Adults were long assumed to lose functional BAT after infancy. Imaging work over the past two decades knocked the idea over completely, showing both that grown adults retain active brown fat and that the ones carrying more of it hold less body fat overall.

A 2013 review by Saito & Yoneshiro examined the human evidence and concluded that capsinoids and capsaicin activate brown fat thermogenesis and reduce body fat in humans, working through TRPV1 activation in the gastrointestinal tract that signals sympathetically to BAT depots.[3]

Here lies the reason the thermogenic effect appears more reliably in some folks than others. BAT activity varies enormously between people and declines with age, so a 55-year-old with minimal remaining brown fat gets less out of the same dose of cayenne than a 25-year-old with plenty.

Suppressing Your Appetite?

Here’s where the popular claims and the human data part ways, and we’re going to uncover WHAT exactly causes the confusion.

The mechanistic story sounds excellent: TRPV1 activation in the gut, sympathetic stimulation, reduced ghrelin (hunger hormone), increased satiety signalling. The same story that appears on roughly every supplement label containing cayenne.

The trials tell a more complicated version.

A 2009 crossover study by Smeets & Westerterp-Plantenga fed 30 subjects a lunch with or without capsaicin and measured GLP-1, ghrelin & PYY alongside energy expenditure and satiety across the following hours.[5]

A 2018 randomized placebo-controlled study by Rigamonti et al. tested capsaicin in young obese subjects and turned up something worth sitting with: resting energy expenditure rose significantly after the capsaicin meal compared to placebo (+385.1 vs +235.9 kcal/day, p < .05), while energy intake, hunger, satiety, ghrelin, GLP-1 and PYY showed no significant differences at all.[4]

The authors’ own conclusion: Capsaicin functions as a metabolic activator in this population while failing to produce the hypophagic effect that would have been expected.

Our position on the appetite question: The thermogenic effect replicates reliably across trials, while the appetite-suppression effect does not. Some studies show reduced energy intake, others show nothing at all, and the hormone data specifically has failed to hold up. Anyone selling you cayenne capsules as an appetite suppressant is drawing on mechanism rather than outcomes.

There’s a version of appetite control that capsaicin absolutely does deliver, BUT it has nothing to do with ghrelin. That’s the flavour section further down.

Opening Up Your Circulation

TRPV1 activation on endothelial cells and vascular smooth muscle triggers release of nitric oxide and CGRP (calcitonin gene-related peptide), both potent vasodilators. You end up with wider blood vessels and improved peripheral blood flow, which explains the flushed face and warm hands after something seriously hot.

For those of you currently working on blood pressure and circulation, capsaicin belongs alongside Taurine, Citrulline & Nattokinase as a contributor, but not as the main compound. Capsaicin widens vessels acutely and briefly, and no trial has yet demonstrated the sustained blood pressure reductions those three compounds (especially the first two) deliver.

Killing Pain By Exhausting Your Nerves

This one has the strongest clinical evidence of any capsaicin application, and it works through a mechanism that sounds backwards.

Repeated or high-concentration capsaicin exposure works by a different route than blocking pain signals. It overstimulates the nociceptors until they stop functioning, a process researchers call defunctionalization. The nerve endings temporarily lose membrane potential, stop transporting neurotrophic factors & retract bodily from the skin surface. They regenerate over weeks to months.

A 2017 Cochrane review by Derry et al. examined high-concentration (8%) topical capsaicin patches for chronic neuropathic pain and concluded that the 8% patch has resulted in more participants with significant pain relief than lower-concentration creams, with benefits observed for postherpetic neuralgia, HIV-neuropathy & painful diabetic neuropathy.[7]

Worth being precise about scale: The 8% patch is a prescription medical product applied under clinical supervision, roughly 100 times the concentration of over-the-counter capsaicin creams. Your hot sauce is not doing this.

What matters for you though is that topical capsaicin creams (0.025% to 0.075%) DO work for musculoskeletal pain and joint discomfort, which puts them in the conversation alongside Curcumin for anyone managing training-related aches.

Living Longer?

Chili consumption tracks with longevity across every population ever measured, and each of those measurements comes from observation instead of experiment.

A 2021 meta-analysis by Ofori-Asenso et al. pooled prospective cohort studies from the United States, China, Italy & Iran covering 564,748 adults followed for a median of 9.7 years. Regular spicy food consumers experienced a 12% lower risk of all-cause mortality (HR 0.88, 95% CI 0.86-0.90) compared with folks eating it less than once weekly.[6]

Four separate populations on four different continents, pointing the same direction, with zero heterogeneity between studies.

The obvious caveat needs stating clearly though: These are cohort studies, which establish association that cannot mean causation. Folks who eat spicy food regularly differ from those who don’t in ways that extend well past capsaicin, and no randomized trial has ever tested chili consumption against mortality. Treat this as a reason to feel good about the habit, but not necessarily a reason to start it.

“Coach, Does This Burn Enough To Matter?”

Time for the arithmetics since this is where most capsaicin content fails to deliver.

Take the higher meta-analysis figure of roughly 60 extra calories burned per day. Across a full year of daily consumption that comes to about 21,900 calories, which converts to somewhere near 6 lbs of fat IF nothing else in your nutrition or training changes.

Six pounds over twelve months, assuming perfect daily consistency the whole way through.

Verified effect, but a rather slow one if you ask me. Capsaicin will not out-burn a single takeaway meal, and treating it as a fat loss tool in its own right sets you up for disappointment.

Two further constraints tighten the picture:

• It appears to do nothing in already low-to-moderate body eight subjects. The Zsiborás meta-analysis stratified by body mass index and found that trials with participants averaging under 25 BMI showed no effect on energy expenditure (p = 0.718) or respiratory quotient (p = 0.444). Trials above 25 BMI showed energy expenditure rising 69.79 kcal/day (p = 0.023) with a marked drop in respiratory quotient.[2] The leaner you get, the less this does for you

• Tolerance builds. Regular consumption desensitizes TRPV1 receptors, which is precisely why chili eaters keep escalating the heat. Whether the metabolic response desensitizes alongside the sensory one remains unresolved

Where we land on the thermogenic question: Capsaicin delivers a small, verified lift in energy expenditure and fat oxidation, works best for the folks who need it most, and does close to nothing for anyone already lean. Useful as a contributor. Useless as a strategy.

The strategy comes next, and for the above reasons thermogenesis plays almost no part in it.

The Zero-Calorie Flavour Strategy

Here’s the part I care about most and no one in this space writes about:

Even if we’re being extremely generous with the calculations, during those 6 months in 2023, capsaicin contributed maybe 6 lbs of the 50 through thermogenesis.

What it contributed through flavour though, was six months of meals I looked forward to instead of six months of meals I was “okay” with.

Let’s do the math on something as simple as a chicken breast:

• 2 tbsp ranch dressing: roughly 130 calories

• 2 tbsp barbecue sauce: roughly 60 calories

• 2 tbsp Frank’s RedHot: 0 calories

• 2 tbsp Tabasco: 0 calories

• A heavy shake of cayenne: 0 calories

You get intense, satisfying, meal-transforming flavour for nothing. Across a year of eating this way, the calories you sidestep dwarf the calories capsaicin helps you burn by an order of magnitude.

The behavioural effects stack on top:

• Heat slows your eating rate. Nobody shovels properly spicy food, and eating slower gives your satiety signalling the 20 minutes it needs to register

• Heat drives water intake. You drink far more during a spicy meal, which adds gastric volume and further supports fullness

• Heat keeps your staples alive. Chicken, eggs, cottage cheese & rice lose their appeal by week four. Rotate a shelf of hot sauces through the same foods and they stay worth eating for months, and enjoying your nutrition over months is the variable that determines fat loss outcomes

• Heat replaces the reward. Capsaicin triggers a well-documented endorphin release, scratching a similar itch to the one a dessert would scratch, for zero calories

This connects directly to our Metabolic Priming approach: We don’t oblige our clients to count calories, which means their meals have to satisfy them enough to stop eating naturally and please them enough to anticipate the same meal again next week. Heat ranks among the highest-leverage tools available for both jobs.

A practical note on the hot sauce cabinet: Tabasco and Frank’s RedHot sit at near-zero calories, since they’re built on vinegar, pepper & salt. Sriracha carries added sugar and runs closer to 15 calories per tablespoon, which stays trivial at normal use and becomes worth noticing if you’re pouring it. Sweet chili sauces and most “hot honey” products are desserts, we don’t take them seriously. Check the label once and you’ll know which bottles could belong in your rotation.

Some Caveats About The Evidence…

We put the awkward findings in this piece on purpose rather than hoping you never run into them, and while the fat burner industry has built an entire product category on the mechanism half of this story, we’d rather hand you the outcome half and let you decide what the compound is worth…

The appetite claim comes from mechanism while the outcomes stayed flat. As covered above, the Rigamonti trial found capsaicin raising resting energy expenditure while leaving ghrelin, GLP-1, PYY, hunger, satiety and energy intake untouched.[4] Every cayenne-containing “appetite suppressant” on the market is selling the plausible pathway instead of the measured result.

The effect vanishes in low-to-moderate body weight populations. Anyone already under 25 BMI got nothing measurable from capsaicin in the pooled trials.[2] Capsaicin serves you best precisely while you’re carrying extra weight, and it fades in usefulness the closer you get to your target.

Tolerance is documented and its metabolic consequence isn’t. Sensory desensitization to capsaicin is well established. Whether the thermogenic response fades alongside it has not been properly studied, which means the long-term value of daily consumption carries a question mark.

The mortality data cannot establish causation. Treat the 564,748 adults across four countries as a serious dataset that remains observational.[6]

Reflux causes trouble for a meaningful subset. A 2020 randomized double-blind crossover study using SPECT imaging showed that in patients with non-erosive reflux disease, chili ingestion led to significantly greater gastric accommodation, less satiety, more severe abdominal burning and a trend toward worse heartburn compared with placebo, while healthy volunteers showed no symptom differences at all.[8]

Follow-up work also indicates these symptoms do not subside with chronic consumption in susceptible folks.

Our honest conclusion: Capsaicin has a thermogenic effect that’s verified and small, a fat oxidation effect of similar size, a pain application that’s clinically strong at prescription concentrations, and an appetite claim that mechanism supports and human trials mostly don’t. Its greatest value for a man dropping 50 lbs comes from somewhere else entirely: Making the food you eat every day worth looking forward to.

My Personal Take

2023 turned me into heat obsessed, and I’ve never gone back.

50 lbs in 6 months, and I want to be clear about this before you think it was “hard” of any sort:

I had the time of my life during those six months. My metabolic foundations were already sorted. Everything leading up to establishing all that we summarized in the Metabolic Priming Manifesto was HELL, but if you want to skip the Hell part and also have the time of your life while dropping a hefty amount of body fat, read the whole thing first.

I was eating foods I already liked, and nobody handed me a list of “forbidden” ingredients. Fat loss doesn’t have to feel like punishment, mine and our client’ didn’t either.

What I wanted was more from the food I was already eating. Salt, pepper and the like will get you a seasoned meal and nothing beyond that, and seasoning alone does little for your appetite or your interest in sitting down to eat again tomorrow.

Tabasco and Sriracha were my gateway drugs. A few dashes on something I already enjoyed, and the whole meal woke up. Within a month I had cayenne, chili flakes, Tabasco & Sriracha in permanent rotation, and I was going through hot sauce faster than milk.

What I felt stayed mild and predictable: A flushed, warm sensation after spicy meals, noticeably more water on the table, and meals taking considerably longer to finish. However, the behavioural changes I experienced made me permanently obsessed with heat. Food I could repeat for months without a flicker of resentment, and a reason to look forward to lunch on a Tuesday in the middle of Month 5.

Not gonna lie, I spent a while assuming the thermogenic story was doing the heavy lifting, and running the maths honestly knocked out the assumption. Roughly 6 lbs of a 50 lb drop is a rounding error next to the 44 that came from six months of eating well. The spices didn’t make those six months possible, but they DID make them a hell lot more fun.

If you’ve never dropped a serious amount of fat before, heat does something valuable in the same direction: It makes the whole process more enjoyable, easier to stick with, and far quicker to learn, since you find out fast which foods you can live with long-term.

Another case where a boring behavioural tool outperforms the exciting biochemical one by roughly an order of magnitude.

Who Benefits The Most

Before you’d go clear out the hot sauce aisle, worth checking whether heat addresses the thing that’s blocking you:

Capsaicin is most useful for:

• Men over 40 carrying extra weight, where the thermogenic effect measurably shows up

• Anyone whose previous fat loss attempts collapsed from boredom long before hunger became the issue

• Folks eating in a structured way who want their staple meals to stay enjoyable month after month

• Anyone replacing calorie-dense condiments (ranch, mayo, barbecue sauce, sweet chilli) with near-zero-calorie alternatives

• Trainees managing joint or muscular aches who’d benefit from topical capsaicin cream

• Anyone building the habit of eating slower without needing to think about it

It’s less useful for:

• Any of you with GERD, reflux, gastritis, peptic ulcers or IBS, where the evidence points at genuine symptom aggravation that doesn’t fade with exposure

• Folks already lean, where the pooled trials found no measurable metabolic effect

• Anyone expecting a fat burner, since the maths above sets the ceiling and it sits low

• Folks who simply dislike spicy food. Tolerance builds with exposure, though forcing it serves nobody

• Anyone with a capsaicin or nightshade sensitivity

If your meals already taste good enough that you look forward to them and your metabolic markers sit where you want them, capsaicin becomes a pleasant addition and nothing more. If your nutrition is structured but has started to bore you, heat solves the boredom without touching the structure, and it does it in about four seconds per meal.

Dosage & How To Take

Here’s the practical breakdown:

• Supplemental capsaicin: 2-6mg capsaicinoids daily, which matches the range used across most positive trials

• Cayenne pepper (food): ¼ to ½ tsp daily, worked into meals or stirred into water

• Hot sauce: No meaningful ceiling on the vinegar-based zero-calorie ones. Use it like salt

• For metabolic effect: Morning dosing, which spreads the thermogenic response across the day

• For appetite: Before or during meals, though set your expectations by the evidence above

• For pain: Topical cream at 0.025-0.075%, applied 3-4 times daily for several weeks before judging

• Minimum trial period: 4 weeks, which is long enough to know whether you enjoy the heat

A few practical notes from personal experience and client feedback:

• Start small and build slowly. TRPV1 tolerance develops with exposure, which means the heat you find punishing during Week 1 becomes pleasant by Week 4. Escalating too fast just makes you quit

• Always take capsules with food, no exceptions. Concentrated capsaicin hitting an empty stomach causes abdominal burning in most folks who try it

• Whole food beats capsules for the purpose that matters. Capsules deliver the thermogenic dose and none of the flavour benefit, and the flavour benefit is the larger effect

• Rotate your sources. Cayenne, chipotle, gochugaru, harissa, chilli oil, fresh jalapeños & a shelf of vinegar-based sauces keep meals varied in a way that a single hot sauce cannot

• Wash your hands before touching your face. Capsaicin dissolves in fat, so plain water accomplishes nothing. Soap, oil or dairy will lift it

Stacking Recommendations

Capsaicin integrates naturally into the metabolic and adherence strategies we’ve been building across this series:

• Capsaicin + Caffeine = Layered thermogenesis. Caffeine raises energy expenditure through adenosine blockade and catecholamine release while capsaicin adds TRPV1-mediated heat production. The two most evidenced thermogenic compounds available, both modest on their own but additive together

• Capsaicin + Psyllium Husk = Satiety from two directions. Psyllium adds gastric volume and slows gastric emptying while capsaicin slows eating rate and drives fluid intake. Both attack the same problem through completely separate routes

• Capsaicin + Chromium Picolinate = Craving management. Chromium supports insulin signalling and suppresses sugar cravings while capsaicin supplies intense flavour reward for zero calories. A practical pairing for anyone whose fat loss keeps dying at the biscuit tin

• Capsaicin + Curcumin = Spice-derived anti-inflammatory coverage. Curcumin suppresses NF-κB systemically while capsaicin contributes local analgesic and anti-inflammatory activity. Both belong in the same spice rack and the same protocol

• Capsaicin + Rhodiola = Energy from two angles. “The Viking Drug” addresses mitochondrial ATP and mental fatigue while capsaicin raises the thermogenic floor. Useful during a sustained deficit when energy tends to sink

For our clients working through a structured fat loss phase, the Capsaicin + Caffeine + Psyllium Husk combination covers thermogenesis, appetite and adherence without adding a single step to anyone’s morning.

Safety & Side Effects

Capsaicin has an extensive safety record built on a few thousand years of human consumption at scale. A few things worth knowing though:

• Well tolerated by most folks at culinary doses and at supplemental doses of 2-6mg capsaicinoids

• Abdominal burning, heartburn and diarrhoea are the most common complaints, driven by dose and by taking concentrated forms without food

• GERD, reflux, gastritis & peptic ulcer disease: The evidence points the wrong way here and habituation doesn’t rescue it. If any of these apply to you, skip this compound entirely[8]

• IBS: Symptom aggravation is commonly reported, though tolerance varies widely between folks

• Blood pressure medications: Capsaicin’s vasodilatory effect could theoretically compound with antihypertensives. Worth monitoring rather than avoiding it entirely

• Anticoagulants: Some evidence suggests mild antiplatelet activity, which matters for anyone already taking Nattokinase, aspirin or warfarin and the like

• Topical application: Never apply near eyes or mucous membranes, and wash hands thoroughly afterward. Capsaicin dissolves in fat and oil, not water

• Extreme heat products: Ultra-concentrated extracts and superhot pepper challenges have landed folks in hospital with oesophageal injury and thunderclap headache. The novelty stuff sits in a completely different risk category from the sauce on your table

For culinary use at any dose you find pleasant, in folks without upper GI conditions, capsaicin is about as safe as any compound we’ve covered. The failure modes all cluster in two places: Concentrated products taken without food, and folks whose gut was already telling them NO.

A Few Words on Sourcing

Capsaicin is the rare compound in this series where the grocery store beats the supplement aisle outright.

We’d recommend building the cabinet like this:

• Vinegar-based hot sauces with a short ingredient list. Pepper, vinegar, salt. Check for zero added sugar

• Whole dried chillies or single-source ground cayenne over “chilli powder,” which is usually a seasoning blend containing cumin, garlic powder & salt

• Variety over quantity. Six different chillies used occasionally beats one used constantly, both for the palate and for the range of accompanying compounds

• Capsules standardized to capsaicinoid content if you want the thermogenic dose without the burn, ideally with a sustained-release or enteric coating to limit gastric irritation

• Topical creams at 0.025-0.075% for musculoskeletal use, from a manufacturer that states the concentration on the packaging

• Skip the superhot extracts. Concentrated capsaicin extracts sold on heat alone carry the risk profile without any of the culinary benefit

Final Thoughts

Capsaicin earns its place in this series for reasons that sit well outside the way it usually gets sold: A verified but modest thermogenic effect, a measurable fat oxidation shift, a clinically strong pain application at prescription concentration, and a behavioural utility that outweighs all three combined.

The clinical data shows capsaicinoids raising resting metabolic rate by around 34 kcal/day across 13 pooled trials, lifting energy expenditure by nearly 59 kcal/day with a clear shift toward fat oxidation across 9 more, activating brown adipose tissue through TRPV1 signalling, and tracking with a 12% lower all-cause mortality across 564,748 adults on four continents.

The same body of evidence shows the effect disappearing entirely in lean participants, the appetite-hormone story failing to replicate, the mortality evidence remaining purely observational, and a significant subset of folks for whom this compound reliably causes trouble. All of which covered above.

A shake of cayenne, a bottle of vinegar-based hot sauce, and the willingness to build tolerance over a few weeks. Use it for enjoyment and take the metabolic benefits as a bonus, since that’s the direction the evidence points towards.

Shortly, Capsaicin is the compound that makes eating in a structured way feel like eating better.

If you’re a business owner or corporate executive looking to lose 20-50+ pounds following a complete & tailored system for your nutrition, sleep, training and metabolism that gets you Lean & Energetic

Without counting calories, eliminating entire food groups or training more than 2-3 hours/week,

Schedule Your Free Consult Today to see if we’re a great fit for working together 1-on-1.

We’ve now helped 100+ successful entrepreneurs & executives reclaim their bodies and energy using our three pillars of Time Efficiency, Metabolic Priming, and Natural Accountability. You might just be the next one ;)

Until then,

Keep it Lean & Energetic!

Best,

Coach Abris

Check out more about what we do HERE.

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Disclaimer: This article is for educational purposes only and is not medical, legal, or financial advice. Consult with qualified professionals before making any health, legal, or financial decisions.

References

[1] Irandoost et al. - Capsaicinoids or Capsinoids in Red Pepper on Thermogenesis in Healthy Adults: Systematic Review & Meta-Analysis (2021): ● Irandoost P, Lotfi Yagin N, Namazi N, Keshtkar A, Farsi F, Alamdari NM, Vafa M. “The effect of Capsaicinoids or Capsinoids in red pepper on thermogenesis in healthy adults: A systematic review and meta-analysis.” Phytother Res. 35(3):1358-1377 (2021). ● https://pubmed.ncbi.nlm.nih.gov/33063385/

[2] Zsiborás et al. - Capsaicin and Capsiate as Agents for Treatment of Obesity: Meta-Analysis of Human Studies (2018): ● Zsiborás C, Mátics R, Hegyi P, Balaskó M, Pétervári E, Szabó I, Sarlós P, Mikó A, Tenk J, Rostás I, Pécsi D, Garami A, Rumbus Z, Huszár O, Solymár M. “Capsaicin and capsiate could be appropriate agents for treatment of obesity: A meta-analysis of human studies.” Crit Rev Food Sci Nutr. 58(9):1419-1427 (2018). ● https://pubmed.ncbi.nlm.nih.gov/28001433/

[3] Saito & Yoneshiro - Capsinoids and Related Food Ingredients Activating Brown Fat Thermogenesis in Humans: Review (2013): ● Saito M, Yoneshiro T. “Capsinoids and related food ingredients activating brown fat thermogenesis and reducing body fat in humans.” Curr Opin Lipidol. 24(1):71-77 (2013). ● https://pubmed.ncbi.nlm.nih.gov/23298960/

[4] Rigamonti et al. - Acute Capsaicin Increases Resting Energy Expenditure Without Affecting Energy Intake or Appetite Peptides (2018): ● Rigamonti AE, Casnici C, Marelli O, et al. “Acute administration of capsaicin increases resting energy expenditure in young obese subjects without affecting energy intake, appetite, and circulating levels of orexigenic/anorexigenic peptides.” Nutr Res. 52:71-79 (2018). ● https://pubmed.ncbi.nlm.nih.gov/29530622/

[5] Smeets & Westerterp-Plantenga - Acute Effects of a Lunch Containing Capsaicin on Energy Utilisation, Hormones & Satiety (2009): ● Smeets AJ, Westerterp-Plantenga MS. “The acute effects of a lunch containing capsaicin on energy and substrate utilisation, hormones, and satiety.” Eur J Nutr. 48(4):229-234 (2009). ● https://pubmed.ncbi.nlm.nih.gov/19238310/

[6] Ofori-Asenso et al. - Spicy Chilli Food Consumption With Cardiovascular & All-Cause Mortality: Meta-Analysis of Prospective Cohort Studies (2021): ● Ofori-Asenso R, Mohsenpour MA, Nouri M, Faghih S, Liew D, Mazidi M. “Association of Spicy Chilli Food Consumption With Cardiovascular and All-Cause Mortality: A Meta-Analysis of Prospective Cohort Studies.” Angiology. 72(7):625-632 (2021). ● https://pubmed.ncbi.nlm.nih.gov/33657876/

[7] Derry et al. - Topical Capsaicin (High Concentration) for Chronic Neuropathic Pain in Adults: Cochrane Review (2017): ● Derry S, Rice AS, Cole P, Tan T, Moore RA. “Topical capsaicin (high concentration) for chronic neuropathic pain in adults.” Cochrane Database Syst Rev. 1(1):CD007393 (2017). ● https://pubmed.ncbi.nlm.nih.gov/28085183/

[8] Acute Effects of Red Chili on Gastric Accommodation & Upper GI Symptoms in Healthy Volunteers and GERD Patients: RCT (2020): ● “Acute Effects of Red Chili, a Natural Capsaicin Receptor Agonist, on Gastric Accommodation and Upper Gastrointestinal Symptoms in Healthy Volunteers and Gastroesophageal Reflux Disease Patients.” Nutrients. 12(12):3740 (2020). ● https://pubmed.ncbi.nlm.nih.gov/33291700/

[9] Sustained-Intestinal Release Red Chili Capsaicinoids (Capsifen) on Energy Balance & Endurance Performance: RCT (2024): ● “A natural sustained-intestinal release formulation of red chili pepper extracted capsaicinoids (Capsifen) safely modulates energy balance and endurance performance: a randomized, double-blind, placebo-controlled study.” Front Nutr. 9:1348328 (2024). ● https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10987775/

Never in my wildest dreams would I have ever expected to talk about a 20-year-old who injects more compounds before lunch than most oncology wards dispense in a week.

Especially not in this newsletter.

But even blatantly stupid claims can have an ounce of truth to them, and it raises a serious question most of you have never thought about or considered

But would definitely serve your best interests in the long run.

So who is this deranged 20-year-old, and what did he say that warrants us to go deep into the psychological science behind biochemistry supplements and fat loss pharmaceuticals?

He goes by Clavicular, and he’s currently the loudest face of looksmaxxing, the online sport where young men chase facial aesthetics with a syringe, a mallet and an unshakeable conviction that a sharp jawline separates the aristocrats from the plebs.

His publicly stated stack involves 220mg of testosterone, 25mg of isotretinoin, 10-12mg of retatrutide, 10mg of nebivolol, Melanotan II & Anavar.

Which is roughly what happens when you throw a live grenade into a chemistry lab and monetize the footage.

And this is probably just the tip of the iceberg…

A few weeks back he said something that has been ricocheting around X, TikTok and about six forums ever since.

10mg of retatrutide, in his words, “literally rapes you.” He mentioned becoming apathetic, his personality changing and the whole package that comes with drugs that even though weren’t developed for altering your consciousness, they still do…to a certain extent.

Now hold on before you draw conclusions, since his word of choice has NOTHING to do with the endocrinologic meaning of “rape”.

Rape in this context describes force. Something overpowering your will and taking what it wants while you desperately try to fight back.

What a certain slice of GLP-1 users keep describing has no fight in it whatsoever, since the thing that would have done the fighting has already packed up and left the building. There was no assailant. They simply stopped wanting anything badly enough to notice that the wanting itself had gone.

That’s a far stranger phenomenon than the one he named, and the pharmacology underneath it is more entertaining than either side of this argument currently understands.

So now it’s time to unpack this phenomenon, receptor by receptor, all the way down to the amino acids, with 3000 years of plants, fungi, vitamins and glorious scientific accidents along the way…

Quick preface so nobody takes this the wrong way: We are not anti-GLP-1 here and never have been, and we laid out that position in full in the old car versus new car problem with GLP-1s. This class does things for metabolically shot men that willpower has been failing at for 40 years.

What follows is about what these compounds do to your head. More precisely your motivation, mood, drive, and the part of you that decides anything is worth getting up for.

The Worst Witness In History

Let’s get the elephant out of the room first, since it’s the most hilarious part of the whole saga.

Try isolating a single variable in the stack mentioned above.

Isotretinoin has carried a psychiatric controversy for three decades, with depression printed in its labelling and argued over since the 1990s. Beta blockers like nebivolol have a long-standing reputation for fatigue and flattened affect.

Supraphysiological testosterone does things to emotional regulation that anyone who’s spent a month around the hardcore gym bros blast-and-cruising year round can describe without opening a textbook. And by his own account (alongside the streamers around him), some stimulant abuse has been involved as well.

So imagine a 20-year-old blasting 5-6 mood-altering (or at the very least mood-relevant) compounds at once, and pointing the finger at the newest arrival.

(To be fair to the lad, this is what every single one of us does. Five things change, one of them is new, and the new one collects both the credit and the blame. We do it with supplements, training splits and coaches. Deeply human accounting error, and this objectively doesn’t make him an idiot.)

A compromised witness tells you exactly nothing about whether the crime took place though…

Our honest take: The n=1 here is worthless as evidence and extremely valuable as a warning. A young man making noise said out loud what thousands of quieter users have been muttering in forums for two years, and we’re less interested in investigating what he said, but look deeper into the muttering instead…

Grandma’s Blood Pressure Pill

Before we get anywhere near receptors, a bit of history, since the notion that a metabolic drug might edit your personality gets treated online as some shocking new frontier when it’s one of the oldest observations in medicine.

Rauwolfia serpentina, known in Sanskrit as sarpagandha, turns up in Indian medical texts going back roughly 3,000 years and in the works of Charaka. Traditional practitioners reached for the root to treat hypertension, insomnia, snakebite and what the texts politely call “insanity”. It calmed folks down, which was the entire selling point.

In 1952, CIBA in Switzerland isolated the active alkaloid, reserpine, and launched it as a blood pressure drug.

Three years later a JAMA paper on Rauwolfia-treated hypertensives arrived with a title you could not write today without a lawyer present: “Controlled study disclosing occasional severe depression” (3).

Huge breakthroughs followed, arguably for the betterment of science. Researchers worked out that reserpine empties brain monoamines by blocking their loading into synaptic vesicles, and pairing “this drug drains your serotonin, noradrenaline and dopamine” with “some of these patients went dark” gave birth to the monoamine hypothesis of depression (4), which went on to fund, steer and justify the entire antidepressant era we’re currently living in.

Then history did something delicious with it…

In 2003, Baumeister and colleagues published a historical analysis arguing that reserpine-induced depression had been heavily inflated in the retelling and that the myth had comfortably outrun its evidence (4). A 2023 systematic review went back through everything and concluded that the associations are inconsistent and hobbled by poor-quality data, calling for nuance in place of a clean story in either direction (5).

Just to state it loud and clear: A drug threw off a mood signal, then the signal got amplified into folklore, which built an entire industry, and 50 years later the careful reviewers concluded: It’s complicated, and it depends on who you are.

Anybody confidently predicting where the GLP-1 personality argument takes sides should go back two paragraphs and read it twice.

Because in the very same decade the identical experiment has been done in reverse.

In 1952 at Sea View Hospital on Staten Island, tuberculosis patients were given an experimental hydrazine drug called iproniazid. Their lungs stayed full of holes while their moods have risen through the roof. The newspapers of the day reported patients “dancing in the halls tho’ there were holes in their lungs,” and the psychiatrist Nathan Kline later rebranded the compound as a “psychic energizer“ (11).

Zeller and colleagues then discovered why: Iproniazid inhibits monoamine oxidase, the enzyme that chews up your monoamines. First antidepressant class in history, discovered in a lung ward entirely by accident.

And if you thought that it’s only pharmaceuticals that alter your brain chemistry, wait until you see what you find in your food.

MAO inhibitors turned out to carry a lethal interaction with tyramine, an amine that accumulates in aged cheese, cured meat and fermented anything. A patient on these drugs could eat a lump of mature cheddar and go into hypertensive crisis, which the field christened as “the cheese reaction”/”cheese effect”.

Grown adults on psychiatric medication were handed printed lists of “forbidden” foods throughout the 1960s, and every item on those lists belonged there.

Our honest stance on this: Every generation discovers that chemistry edits personality, gets loud about it, overcorrects, then files the finding under the “obvious” label and acts surprised all over again 30 years later.

What Was In The Bread

You thought there is no darker version to this story? Then take some Ashwagandha before you read this:

Claviceps purpurea, better known as ergot, is a fungus that colonizes rye in cold, wet conditions and replaces the grain with black sclerotia that look enough like kernels that farmers milled the lot without noticing until the 1800s. Inside those bodies are ergot alkaloids, including lysergic acid, the precursor from which LSD was later built.

Eat contaminated bread and you get ergotism, in one of two flavours. The gangrenous form constricts your blood vessels until limbs blacken and drop off, which medieval Europe called St Anthony’s Fire. The convulsive form brings fits, hallucinations, crawling sensations under the skin and delirium.

In April 1976, a psychology graduate student named Linnda Caporael published a paper in Science titled “Ergotism: The Satan Loosed in Salem?“, proposing that convulsive ergotism triggered the Salem witchcraft crisis of 1692 (6).

Her case rested on the wet, warm growing season of 1691, the rye-dependence of Salem Village, and a symptom list from the court records that maps onto ergot poisoning with uncomfortable precision.

Twenty of them were executed (along with two dogs).

Now let’s be honest before we conclude on anything… In December of the same year, Spanos and Gottlieb published a full rebuttal in the same journal, pointing out that the general features of the crisis look nothing like a documented ergotism epidemic and that the supporting evidence collapses under inspection (7). Most serious historians of Salem have never touched the theory since.

Two contested stories, 20 years apart in publication and 300 in subject matter, both following the identical arc: The observed biochemical phenomenon exists, but with a seductive explanation, wildly popular uptake, careful rebuttal, and a public that only ever remembers the first two steps.

Remember this contrast, you’re going to make good use of it as we go deeper…

When Madness Was A Vitamin

Here comes the most shocking part, involving the exact amino acid we’ll be discussing shortly.

In the early 1900s, the American South was drowning in a disease called pellagra. Between 1906 and 1940 it infected more than 3 million Americans and killed over 100,000 of them. The textbooks called it the disease of the four Ds: Dermatitis, diarrhoea, dementia, death.

Focus on that third D for a second.

Pellagra sufferers picked up depression, obsessions, mania, confusion and outright psychosis alongside the rash, and thousands of them were committed to asylums where they died.

In 1914, an epidemiologist named Joseph Goldberger was assigned to work out the cause. He noticed that orphanages, prisons and asylums were full of it while the staff working in those same buildings stayed healthy, which torpedoed the prevailing germ theory.

In 1915 he ran a trial at the Rankin State Prison Farm in Mississippi, putting eleven volunteer inmates on the standard poor Southern menu of cornbread, molasses and fatback pork in exchange for full pardons. Six of the eleven developed pellagra (8).

The medical establishment and Southern political leadership hated the finding, since it pointed a finger at poverty. Goldberger died in 1929 without ever isolating the missing factor.

Biochemists in Wisconsin nailed it in 1937: Niacin, vitamin B3, which your body also manufactures out of the amino acid tryptophan. Corn holds niacin in a form humans cannot extract, which is why Mexican peasants who treated their maize with lime never developed the disease and Southern sharecroppers who skipped that step did.

And now we are close to going a full circle:

When American psychiatry drew up its first official classification of mental diseases in 1917, it included a formal diagnosis: Psychosis with pellagra. The entry survived the 1934 revision and by 1942 had been tidied away under “psychoses due to disturbances in metabolisms” (9).

A B-vitamin shortage held a place in the official psychiatric manual as a mental illness for 25 years, and the treatment was simply “dinner”.

Got what that means for our context Folks? The proposition that a drug altering nutrient availability could change who somebody is (personality-wise) has been settled science for the better part of a century. It’s still crazy to think how everyone just forgot.

Who Are You When You’re Hungry

One more HUGE factor to consider before the pharmacology of GLP-1s, and it’s arguably more nuanced than everything above.

Between 1944 and 1945, Ancel Keys put 36 conscientious objectors through six months of semi-starvation at the University of Minnesota, publishing the results in 1950 across two volumes and 1,385 pages as The Biology of Human Starvation (10). Most participants shed around 25% of their bodyweight.

The mental results are what concern us. On the Minnesota Multiphasic Personality Inventory, scores climbed across hypochondriasis, depression and hysteria with enough consistency that Keys gave the cluster a name: Semi-starvation neurosis.

The men turned irritable, apathetic, withdrawn and obsessive about food, stopped finding things funny, stopped washing properly, and started falling out with each other over nothing. A handful decompensated well past that, and two got close to psychosis.

And this was WAY before any receptor agonism got involved anywhere. An extreme caloric deficit did all of it, in healthy young volunteers who signed up on purpose…

So when a man drops 28.7% of his bodyweight in 68 weeks, which is precisely what the 12mg retatrutide arm delivered in Lilly’s TRIUMPH-4 Phase 3 trial (2), and then reports feeling like the lights have dimmed…

We have to ask how much of that belongs to the molecule VS the deficit the molecule made effortless.

(Both can be happening at once, and usually are. One-variable thinking fails badly in this territory.)

Our honest perspective: A large chunk of what gets pinned on GLP-1 drugs belongs to the aggressive deficit those drugs make easy, and Keys documented the whole thing in 1950 with nothing more sophisticated than potatoes, turnips and a scale.

What It Does In Your Head

Now the pharmacology…

GLP-1 receptors work well beyond your pancreas and gut where they get released. They’re expressed across brain regions that control what you want and how hard you’ll work to get it: The ventral tegmental area, the nucleus accumbens, the amygdala, the hippocampus and the lateral septum (12).

Those first two form the mesolimbic dopamine pathway, which is the circuitry of motivation itself.

GLP-1-producing neurons in the nucleus of the solitary tract project straight into the VTA and the nucleus accumbens, and switching on GLP-1 receptors in those regions cuts food reward behaviour on top of cutting hunger (12).

Wanting and eating are two separate systems, and this class reaches into the first one.

If that sounds too theoretical, just take a look at the human data which closed the gap years ago:

In a Phase 2 randomized trial published in JAMA Psychiatry, adults with alcohol use disorder received low-dose semaglutide or placebo for nine weeks. The treated group drank less alcohol in a laboratory self-administration task, reported significantly reduced weekly craving, and among the smokers in the sample, cut cigarettes per day against placebo (13).

You’re seeing where this goes, right?

A quantity of semaglutide most clinicians would describe as a starter dose measurably lowered how much a man wanted whisky and tobacco. Whether they carry any statistically significant caloric meaning whatsoever is heavily debated.

A compound that can turn down your appetite for booze and cigarettes is operating on desire itself, and your personality does not keep desire in a separate room from everything else.

Which is exactly why the anhedonia reports definitely do NOT belong in the BS category.

The Third Receptor

Now the mechanistic argument we haven’t seen made properly anywhere, and the reason this piece exists:

Retatrutide is a triple agonist, hitting GIP (glucose-dependent insulinotropic polypeptide), GLP-1 and glucagon receptors in one molecule (1).

Semaglutide works on GLP-1 alone and tirzepatide hits GIP with GLP-1, so retatrutide carries a third target that behaves nothing like the other two.

Glucagon does far more than simply raising blood sugar. Through what researchers call the liver-alpha cell axis, it instructs your liver to pull amino acids out of circulation, catabolize them, and dump the nitrogen through ureagenesis.

In a 2022 study in iScience, mice received a long-acting glucagon analog twice daily for four weeks. Total plasma amino acids dropped to 52% of baseline, urea handling shifted upward, activity of the rate-limiting urea cycle enzyme carbamoyl phosphate synthetase-1 climbed, and all 18 measured amino acids fell (14).

Follow the chain, since this is where the second and third order effects live:

Glucagon receptor agonism → liver strips amino acids from your circulation → shrinking plasma amino acid pool → fewer precursors arriving at the blood-brain barrier → tryptophan feeds serotonin synthesis, tyrosine feeds dopamine synthesis → less raw material for the two neurotransmitters that control mood and drive

And all of it stacks on top of a man eating maybe 40% of his former food volume, since his appetite has been switched off. So his protein intake collapses at the exact moment his liver receives orders to burn whatever still manages to arrive.

Two independent pressures on one amino acid pool, arriving together, in a drug class whose trial protocols don’t include an amino acid panel.

Now the caveats, since convincing you about compounds with a mechanism harder than its evidence is not our cup of tea:

• The experiment used mice, not men, and a glucagon analog instead of retatrutide itself

• Tryptophan and phenylalanine were among the least affected amino acids in that experiment, which cuts straight against the cleanest version of the hypothesis

• No human plasma amino acid data has been published on retatrutide specifically

What the authors did flag themselves is that a GLP-1/glucagon dual agonist lowered plasma amino acids in earlier work, and that a 23-hour glucagon infusion in overweight and obese subjects threw up plasma amino acids as the dominant metabolite separating treatment from placebo (14).

Our stance: If retatrutide turns out to feel different from semaglutide deep beneath the calcified layers of your skull, the glucagon receptor is the first place we’d go looking, and the fact that this remains unmeasured in a compound heading toward an FDA filing should bother more folks than it currently does.

Your Strongest Mood Organ

The second-order pathway the discourse almost never connects:

Across the registration trials, lean mass losses on this class have been severe. In STEP-1, semaglutide participants dropped 6.92kg of lean tissue against a 15.3kg total reduction, meaning 45.2% of the weight lost was lean mass. In SURMOUNT-1, tirzepatide participants dropped 5.67kg of lean against 22.1kg total, or 25.7%. Liraglutide has been reported as high as 60% (15).

Pharmacological agent

Population

Measurement

Body weight change from baseline in kg or litres (%)^d

Lean change from baseline in kg (%)

Fraction lost (or gained) of lean mass/volume as a proportion of total weight loss (%)

Semaglutide (STEP-1)¹

BMI ≥30 kg/m² or BMI ≥27 kg/m² + comorbidity No diabetes

DXA (lean mass)

−15.3 (−14.9%)

−6.92 (−13.2%)^a

−45.2%^a

Semaglutide (SUSTAIN-8)³¹

Type 2 diabetes

DXA (lean mass)

−5.3 (−6.0%)^a

−2.3 (−4.5%)^a

−43.4%^a

Tirzepatide (SURMOUNT-1)²

BMI ≥30 kg/m² or BMI ≥27 kg/m² + comorbidity No diabetes

DXA (lean mass)

−22.1 (−20.9%)^b

−5.67^e (−10.9%)

−25.7%^e

Liraglutide + lifestyle (Neeland)^{32, 33}

BMI ≥30 kg/m² or BMI ≥27 kg/m² + metabolic syndrome No diabetes

MRI (lean volume)

−6.75 (−6.6%)

−1.02 (−2.5%)^c

−15.0%^a

Liraglutide (Lundgren)³⁴

BMI ≥32 kg/m² No diabetes

DXA (lean mass)

−0.7 (−0.7%)^a

0.0 (0.0%)^a

0.0%^a

Liraglutide + exercise (Lundgren)³⁴

−3.4 (−3.5%)^a

0.5 (+0.8%)^a

+14.7%^a

(Table 1 of (15))

Most men file those numbers under physique, or at best under metabolic rate.

They belong in psychiatry too, through the following pathway:

In 2014, Agudelo and colleagues published work in Cell showing that exercise-conditioned skeletal muscle upregulates kynurenine aminotransferases through the PGC-1α1 pathway. Those enzymes convert kynurenine (a tryptophan breakdown product tied closely to depression) into kynurenic acid, a metabolite that cannot cross the blood-brain barrier.

Roughly 60% of the kynurenine in your brain arrives from the periphery, and kynurenine alongside its metabolites correlates strongly with depression through effects on neuronal survival, glutamate transmission and neuroinflammation (16).

Trained muscle works as a filter standing between a depressive metabolite and your brain.

More lean mass, better conditioned → higher kynurenine aminotransferase activity → more kynurenine converted peripherally into kynurenic acid → less of it crossing into your brain → measurable resilience against stress-induced depression

Now run that backwards for a man losing 45% of his net weight loss as lean tissue while staying completely untrained...

At this point lifting through a GLP-1 protocol becomes a neurochemical decision that happens to also improve how you look in a shirt.

The men who lose their drive on these compounds are disproportionately the ones who also lost their muscle, and those two observations share a mechanism that has nothing to do with mirrors.

The Question They Never Asked

Time for the fair hearing, since we’re not in the business of frightening you off something that might suit you perfectly.

Regulators looked hard at this.

The EMA’s Pharmacovigilance Risk Assessment Committee opened a review in July 2023 following case reports of suicidal thoughts and self-injury among liraglutide and semaglutide users.

By April 2024, having worked through roughly 150 reports, demanded additional data from manufacturers and reviewed a large electronic health record study, the committee concluded that available evidence failed to support a causal association with suicidal or self-injurious thoughts and actions (17). The FDA had landed in the same place that January, with the MHRA following the September after.

Let’s assume these three regulators worked independently and none of them found significant suicide risks…

Now notice what they were asked…

The question on the table was whether these drugs make men kill themselves. The question left off the table was whether these drugs make men flat, unmotivated, emotionally muted or subtly less like themselves. Two completely different endpoints, and pharmacovigilance systems catch catastrophes far better than they catch the slow erosion of somebody’s spark.

The signals that do exist point straight at that softer territory:

A disproportionality analysis of the WHO VigiBase database through December 2024 returned adjusted reporting odds ratios for semaglutide of 1.70 for depressed mood disorders and disturbances, 1.45 for suicidal and self-injurious behaviours, 1.26 for anxiety, and an eyebrow-raising 6.80 for eating disorders (18). Dulaglutide and liraglutide threw eating disorder signals of 4.45 and 4.17.

Case reports supply the texture. A 2023 paper in Frontiers in Psychiatry described two middle-aged patients who developed depressive symptoms roughly a month after starting semaglutide (19).

One of them was a successful company manager with no psychiatric history, described as optimistic, active and efficient before any of it started. Within weeks he had fatigue that sleep couldn’t improve, no interest in anything, trouble concentrating and a need for far more sleep than usual. Both patients improved once the drug came out.

(If you’re on one of these right now and just recognized yourself in the previous paragraph, take it as information. Recognition is the first useful step here, and this is fixable in the overwhelming majority of cases.)

Take this away with yourself: “No causal link to suicide” and “no effect on your personality” are two very different sentences, and the second one has barely been studied.

The Study That Ruins Everyone’s Argument

Then in May 2026 a group from Cambridge published something that inconveniences both camps at once, and it’s the most important paper in this entire piece.

Mehrhof, Fleming and Nord ran a pre-registered study measuring effort-based decision-making across four matched groups: Type-2 diabetics on semaglutide, type-2 diabetics off it, non-diabetic controls matched for BMI, and lean non-diabetic controls (20).

Their measure was a computational parameter called acceptance bias, capturing how strongly somebody leans toward accepting effort in exchange for reward. It’s the nearest thing cognitive science has to a number for “how much do you feel like doing things,” and it maps reliably onto apathy, anhedonia and depression.

Three findings, in ascending order of how badly they should shake your assumptions:

One: Type-2 diabetics showed suppressed acceptance bias against controls. Lean healthy participants scored highest, diabetics on semaglutide scored lowest.

Two: Across all 228 participants, rising metabolic risk linearly predicted falling acceptance bias (b = –0.129, p = 0.014). The worse your metabolic health, the less inclined you are to trade effort for reward, and the effect survived controlling for antidepressant use.

Three, and this is the big one: Participants on semaglutide showed no restoration of motivation whatsoever against matched diabetics who’d never touched it. Time since injection made no difference either. The authors had hypothesised the opposite and stated plainly that the result surprised them.

Think about what that does to the argument…

The loss of motivation went hand-in-hand with the metabolic dysfunction, not with the drug itself. The authors frame it as a cognitive shift toward energy conservation, a brain deciding that resources look scarce and effort should therefore be rationed.

Which raises a possibility neither camp wants to hold: a noticeable share of men who feel switched off on a GLP-1 were already switched off before the first injection, and the loss of drive that follows a suppressed appetite is the first time they’ve been still enough to notice.

The drug also failed to correct any of it, which matters just as much.

Why It’s Always The Same Guys

One pattern shows up with almost comedic consistency.

The men who get outstanding results from GLP-1 drugs are, with tedious reliability, the men who would’ve got good results without them…

Which sounds like a cheap dunk until you look at why it carries undeniable truth.

First, they locked in the basics before they touched a syringe. Protein intake already established, resistance training already habitual, sleep quality already handled, and a working understanding of what their own body does under a deficit since they’d been in one before. The compound removed a friction they already learned to manage, and everything underneath it kept working. We laid the whole framework out in the Metabolic Priming Manifesto, and internalizing this should be the default prerequisite for using any of this well.

Second, they or their advisor understood the drug class itself. The mechanism, receptor targets, dose-response curve, exit strategy, what happens when you stop, ALL of it. We unpacked all of that in the old car new car GLP-1 tier list and it remains the most useful frame we’ve published on the topic.

The men who struggle are (as always) doing everything backwards: Zero training foundation, laughable protein intake, skipping a COMPLETE blood work, and a dose chosen based on their favourite peptide guru’s advice or (even worse) a number mentioned by a 20-year-old on Kick.

And for a decent slice of folks, particularly those whose main trouble lies in glucose control and visceral fat rather than appetite dysregulation, an entirely different class may suit them better. We made that case in the $8 pill that slam dunks on the competition, and the SGLT-2 class deserves way more emphasis than it gets from men who assume GLP-1 is the only door in the building.

And there is a rare, third group of men we call ABSOLUTE FCKIN’ LEGENDS, who - against all odds - realize they never “needed” pharmaceuticals in the first place, even though they are viable & effective options nowadays. They did their fair share of testing, research, and based on their own decision, they opted for taking a different route.

Our client Kevin, 47, arrived above 370 lbs with diabetes and a medication list that took a while to read through. He came down to around 300 lbs in his first 8 months and off multiple medications, and the side effects he got rid of along the way belonged to the very same drugs he’d been prescribed.

Our client Billy, a 48-year-old mortgage loan consultant and single dad of 3, took 8 years off his heart age in 6 months without a single weight-loss drug, training 3X/week for 40-50 minutes on a basic home gym equipment in the corner of his living room.

Different men in different situations with different available tools, but with one key principle underneath: Your systems decide your outcomes, and the compounds (whatever they may or may NOT be) only multiply whatever is already working.

How this translates to our answer to the “Coach, do you recommend GLP-1s to your clients?” question: A GLP-1 is a phenomenal accelerator bolted onto a system that works, and a very expensive way to lose muscle (& your mind) when built into one that doesn’t. We meet you where you are, tell you what’s possible, and respect whatever decision you make, since there are many ways to skin a cat.

If You’re Already On One

Practical, in the order we’d tackle it:

1. Set a protein floor and treat it as untouchable. 0.6-1g per lb of target bodyweight, hit daily, appetite be damned. If solid food is unmanageable at your current dose, a whey concentrate, isolate or hydrolyzate shake 1-2X/day works conveniently well through the appetite suppression phase, and it isn’t “cheating” at all.

2. Lift 2-3X/week, minimum. Full body or upper-lower split, 30-50 minutes, progressive overload. Reread the kynurenine section if you want the motivation. You’re maintaining a mood organ.

3. Get proper bloodwork before and during. Full thyroid cascade including free T3 and reverse T3, ferritin read alongside hs-CRP, B12, RBC magnesium, zinc, total and free testosterone with SHBG. Deficiency in any of those throws symptoms indistinguishable from what folks are calling drug-induced apathy, and we walked through exactly how to order the right panel in the 40 rows your doctor checked and circled nothing.

4. Score your mood and drive weekly, put a number on it. One line in your notes app: Energy 1-10, motivation 1-10, interest in things you normally enjoy 1-10, logged from day one. Memory is a horrendous instrument for detecting slow change, and a man 3 months into a driveless phase cannot reliably tell you what Month 1 felt like.

5. Titrate slowly and stop escalating the moment you get the appetite response you came for. The dose that maximizes weight loss across a trial population and the dose that suits your body are two different numbers, and the trial population wasn’t you.

6. Know which receptors your compound hits. GLP-1 alone, GIP with GLP-1, or all three. Knowing this alone changes everything you screen for.

7. N=1!!! Every item above is a starting point to test against your own response, bloodwork and schedule. Test each one against yourself before you commit to it.

So…Do We Agree With The “Rape” Hypothesis?

We can clearly state Mr. Clav picked the wrong word, but the fact that he reached for one sounding edgy and violent tells you something profound even he might have not thought of:

Rape implies force -> Force implies resistance -> Resistance implies there IS someone to do the resisting.

But what happens when there’s no one to resist?

When you look at the case reports, all the subjects describe a scenario with no struggle or resistance involved anywhere in it. The company manager didn’t fight off a loss of interest. Interest simply stopped showing up for work one morning and he noticed the absence a few weeks later.

Nothing about the mechanism is mysterious either, since every piece of it has already been documented somewhere across nutrition/biochemistry/herbalism/pharmacology.

GLP-1 receptors live in your reward circuitry, and a starter dose of semaglutide measurably lowers how badly you may want three fingers of whisky or a pack of cigarettes.

Retatrutide adds a glucagon receptor that strips your circulating amino acid pool, while the deficit itself drove documented personality change through 36 healthy young men in 1945.

On top of all this, roughly a third of what you’d normally lose on these compounds (assuming NOT having the basics covered) is the exact tissue filtering a depressive metabolite out of your bloodstream.

Meanwhile the best-designed study on the question found the loss of motivation moving together with metabolic dysfunction itself, with the drug correcting precisely NONE of it.

A sign of intelligence is being aware of the opposing views.

A sign of wisdom is the ability to hold two opposing views at the same time.

Because each of the key findings in this article can be true at once, and anybody selling you a blunt, straight and HEAVILY cherry-picked, clean-looking answer in either direction is getting a hefty sum in return for deceiving you.

Our final conclusion is that there is nothing new about the fact that we’ve been trading pieces of our personality for outcomes since somebody chewed the first “magic root” and noticed it did something…

A Mississippi sharecropper lost his mind to a missing vitamin and got committed for it. A hypertensive grandmother lost her drive to sarpagandha and handed psychiatry its founding theory. A ward full of tuberculosis patients found joy in a failed antibiotic and handed us antidepressants. The only new thing about retatrutide is the receptor count.

Know what you’re trading before you trade it. Then decide whether the exchange suits you, which is the same call our species has been making for 1000s of years with far worse information than you’re holding right now.

Ready to drop 20-50+ lbs without outsourcing your personality to a syringe?

We’ve helped 100+ executives, directors, business owners & licensed professionals drop 20-50+ lbs of fat through the Three Pillars of the Demi Cycle Protocol (Time Efficiency, Metabolic Priming & Natural Accountability)

Without counting calories, spending more than 2-3 hours/week in the gym or saying no to

• Family dinners

• Business events

• Your favourite foods & drinks

If something clicked for you reading this, there’s a decent chance we might be a great fit for working together 1-on-1...

Apply Here to Book a Free Strategy Call and let’s see if we’re a great fit for working together 1-on-1.

Until then,

Keep it Lean & Energetic!

Best,

Coach Ábris

Want the full story on what we do? Check it out HERE

💪

More ways we can help you reclaim your body, energy & focus:

Ready to shred fat and restore your energy levels sustainably? Book a free 1-on-1 Strategy Call and discover how our systems can help you achieve a lean & energetic physique without counting calories or spending hours in the gym. We’ll build you a plan that fits your lifestyle and hold you accountable with our tailored 1:1 coaching.

Disclaimer: This piece is for educational purposes only and is not medical, legal, or financial advice. Retatrutide is a pharmaceutical developed by Eli & Lily with its own set of safety guidance and several grey-market alternatives that never passed regulatory approval. Never start, stop or alter any prescribed medication without consulting your prescriber. Consult with qualified professionals before making any health, legal, or financial decisions.

References

1. Jastreboff AM, Kaplan LM, Frías JP, et al. Triple-hormone-receptor agonist retatrutide for obesity: A phase 2 trial. N Engl J Med. 2023;389(6):514-526. https://pubmed.ncbi.nlm.nih.gov/37366315/

2. Eli Lilly and Company. Lilly’s triple agonist, retatrutide, delivered weight loss of up to an average of 71.2 lbs along with substantial relief from osteoarthritis pain in first successful Phase 3 trial. December 11, 2025. https://investor.lilly.com/news-releases/news-release-details/lillys-triple-agonist-retatrutide-delivered-weight-loss-average

3. Achor RW, Hanson NO, Gifford RW. Hypertension treated with Rauwolfia serpentina (whole root) and with reserpine: Controlled study disclosing occasional severe depression. JAMA. 1955;159(9):841-845. https://jamanetwork.com/journals/jama/article-abstract/302789

4. Baumeister AA, Hawkins MF, Uzelac SM. The myth of reserpine-induced depression: Role in the historical development of the monoamine hypothesis. J Hist Neurosci. 2003;12(2):207-220. https://doi.org/10.1076/jhin.12.2.207.15535

5. Strawbridge R, Javed RR, Cave J, Jauhar S, Young AH. The effects of reserpine on depression: A systematic review. J Psychopharmacol. 2023. https://pubmed.ncbi.nlm.nih.gov/36000248/

6. Caporael LR. Ergotism: The Satan loosed in Salem? Science. 1976;192(4234):21-26. https://pubmed.ncbi.nlm.nih.gov/769159/

7. Spanos NP, Gottlieb J. Ergotism and the Salem Village witch trials. Science. 1976;194(4272):1390-1394. https://pubmed.ncbi.nlm.nih.gov/795029/

8. Morabia A. Joseph Goldberger’s research on the prevention of pellagra. J R Soc Med. 2008. https://journals.sagepub.com/doi/10.1258/jrsm.2008.08k010

9. The case of the vanishing diagnosis. Psychiatric News. https://psychiatryonline.org/doi/10.1176/pn.40.2.00400028

10. Keys A, Brožek J, Henschel A, Mickelsen O, Taylor HL. The Biology of Human Starvation. University of Minnesota Press; 1950. Summarized in: They starved so that others be better fed: Remembering Ancel Keys and the Minnesota Experiment. J Nutr. 2005;135:1347-1352. https://jn.nutrition.org/article/S0022-3166(22)10249-X/fulltext

11. Treatment of comorbid tuberculosis and depression. https://pmc.ncbi.nlm.nih.gov/articles/PMC181192/

12. GLP-1 neurons in the nucleus of the solitary tract project directly to the ventral tegmental area and nucleus accumbens to control for food intake. https://pmc.ncbi.nlm.nih.gov/articles/PMC3275387/

13. Hendershot CS, Bremmer MP, Paladino MB, et al. Once-weekly semaglutide in adults with alcohol use disorder: A randomized clinical trial. JAMA Psychiatry. 2025;82(4):395-405. https://pubmed.ncbi.nlm.nih.gov/39937469/

14. Elmelund E, Galsgaard KD, Johansen CD, et al. Opposing effects of chronic glucagon receptor agonism and antagonism on amino acids, hepatic gene expression, and alpha cells. iScience. 2022;25(11):105296. https://pubmed.ncbi.nlm.nih.gov/36325048/

15. Neeland IJ, et al. Changes in lean body mass with glucagon-like peptide-1-based therapies and mitigation strategies. Diabetes Obes Metab. 2024. https://dom-pubs.onlinelibrary.wiley.com/doi/10.1111/dom.15728

16. Agudelo LZ, Femenía T, Orhan F, et al. Skeletal muscle PGC-1α1 modulates kynurenine metabolism and mediates resilience to stress-induced depression. Cell. 2014;159(1):33-45. https://www.cell.com/fulltext/S0092-8674(14)01049-6

17. European Medicines Agency. Meeting highlights from the Pharmacovigilance Risk Assessment Committee (PRAC) 8-11 April 2024. https://www.ema.europa.eu/en/news/meeting-highlights-pharmacovigilance-risk-assessment-committee-prac-8-11-april-2024

18. Psychiatric and psychological adverse effects associated with dulaglutide, semaglutide, and liraglutide: A VigiBase study. https://www.sciencedirect.com/science/article/pii/S0261561425001657

19. Li JR, Cao J, Wei J, Geng W. Case report: Semaglutide-associated depression: A report of two cases. Front Psychiatry. 2023;14:1238353. https://pmc.ncbi.nlm.nih.gov/articles/PMC10495976/

20. Mehrhof SZ, Fleming H, Nord CL. Computational phenotyping of effort-based decision-making in type-2 diabetes on and off semaglutide. Neuropsychopharmacology. https://www.nature.com/articles/s41386-026-02433-y

Have a look at this list and put a checkmark to each that’s true for you:

→ Stubborn belly fat sticking onto you regardless of what you eat

→ Wired but tired by 3pm

→ Unexplained 2-4am wakeups

→ Short temper over things that shouldn’t brother you at all

→ Random cravings hitting at 9pm

→ Slow recovery and injuries that keep showing up

Score 3 or more and you already know where we’re heading…

Worth staying even if you scored zero since the last of the 7 habits we’re breaking down today explains something about body composition that almost nobody in this space describes correctly, and it applies to you whether or not your midsection has caught up yet.

One more thing before we start;

The internet has spent the last 3 years telling you that cortisol is your enemy and your goal is getting it as low as humanly possible. Following that advice has probably made your situation worse, and we’ll go deep into exactly why and how.

Grab a coffee (before 4pm, and you’ll understand why shortly) and let’s dig in.

“Low Cortisol” - Badge Of Honor Or Just Another Buzzword

Let’s nail this first, since everything after this depends on getting it right.

Cortisol follows a diurnal rhythm, meaning it moves along a predictable 24-hour curve instead of parking at one flat level.

Within 30-45 minutes of your eyes opening, healthy cortisol climbs sharply. Researchers call it the Cortisol Awakening Response (CAR), and it exists to mobilize glucose, sharpen your thinking, and get you out of bed, right into starting your day.

From that morning peak, cortisol should fall steadily across the afternoon and evening, bottoming out around bedtime at roughly 20% of where it started. How steep that (ideally) declining curve is, is what researchers call your diurnal cortisol slope.

Steep slope = working system. High in the morning, low at night, sleep arriving on schedule.

So when you wake up groggy, unmotivated and exhausted before 9am, your body has suppressed its own awakening response. Morning grogginess like that points straight at cortisol, and the direction moves opposite to what you assumed.

What the research says about the shape

A 2017 systematic review and meta-analysis in Psychoneuroendocrinology examined the entire body of work on diurnal cortisol slopes and health outcomes. Flatter slopes correlated with worse outcomes in 10 out of the 12 physical and mental health categories assessed, with the sharpest effects landing on inflammation and immune function [1].

What predicted poor health was the FLATNESS of that curve instead of the height of the morning peak.

The four patterns

Once you’ve looked at enough of these curves, you start recognizing four shapes:

• Thriving: Sharp morning rise, steady decline through the day, low by midnight

• Stressed: Elevated across the entire 24 hours, morning peak still present, evening decline blunted

• Wired and tired: Low or flat in the morning, then climbing through the afternoon into a high evening. Backwards.

• Crashed: Flat and low all day, with barely any morning rise at all

As you can clearly see, anything other than the first one is a telltale sign of adrenal dysfunction.

The wired and tired shape sends more successful men to specialists like us than the other three combined, and it delivers the exact symptom cluster from the list at the top of this article.

Low morning cortisol leaves you dragging until that second coffee, while elevated evening cortisol keeps your nervous system stuck in sympathetic activation exactly when it should be trending downwards.

The evening elevation then sends your sleep quality straight to hell, drives visceral fat storage, and guarantees you wake up tomorrow with an even flatter morning.

Chasing “low cortisol” as a target is like fixing a broken transmission by driving slower.

What you want is elevated cortisol at 7am, roughly 80% less of it by bedtime, and a steep and clean slope connecting the two.

Everything in this article either sharpens or flattens the slope.

Keep that picture in your head as we walk through the 7 habits, since each one attacks the slope from a different angle.

1) Caffeine Past 4pm

Let’s start with the one costing you the least to fix.

Caffeine raises cortisol directly, lasting significantly longer than the stimulant effect you’re chasing.

A 2005 study in Psychosomatic Medicine put 96 healthy men and women through a 4-week double-blind crossover trial. Subjects abstained from caffeine for 5 days, then received controlled doses at 9am, 1pm and 6pm while researchers sampled salivary cortisol at 8 points across the day [2].

Two findings matter for you here:

After abstinence, caffeine triggered a substantial cortisol increase across the entire test day. Then it gets even more interesting: In subjects who had been consuming 300mg or 600mg daily, tolerance wiped out the response to the 9am dose completely, yet cortisol still climbed significantly between 1pm and 7pm following the afternoon dose [2].

Tolerance covered them in the morning and abandoned them entirely by the afternoon.

A companion study from the same group confirmed that caffeine elevates cortisol both at rest and during mental stress, with those effects stacking on top of each other rather than swapping places [3].

What this research found still gets INSIDIOUSLY little attention. Every heavy coffee drinker announcing that “caffeine doesn’t affect me anymore” is describing a legitimate adaptation covering their 7am cup and doing absolutely nothing for their 2pm one. The dose you stopped feeling keeps doing the endocrine work anyway. It doesn’t care about how much you “feel” the caffeine buzz.

What that means at 4pm

Your afternoon already carries whatever cortisol the day loaded into it. That 4pm coffee to push through the slump adds fuel to a fire already burning, and the elevation persists roughly 6 hours from the moment you drink it.

Do the math, and it becomes clear as daylight that your 4pm espresso is still working on the HPA axis at 10pm, right when you’re lying in bed wondering why your brain won’t switch off.

What you thought of as an energy fix at 4 pm might be the reason your evening feels like fumes and adrenaline at the same time.

So do yourself a favour and cut the caffeine by early afternoon. We use a noon to 4pm cutoff window with clients depending on chronotype and how fast they clear it, and the full timing protocol lives in our caffeine article. You can still use L-Theanine and Rhodiola to cover for that extra demand for mental focus if you tend to drag work into the late PMs.

One of the telltale signs of a flattened cortisol slope is exactly those days when your afternoon crash hits hard enough that skipping the late dose feels impossible. If that’s where you are, more caffeine will help little to nothing... It’s the slope talking, and you’d be answering it with the same thing that flattened it.

But why would you do it anyway when you have better alternatives, just like the ones mentioned above?

Question for Plato…

2) Skipping Meals To “Stay Productive”

Going 6 or more hours without eating tells your body it might be short on fuel, and cortisol ranks among the fastest hormones answering the signal.

And before you blame your adrenals, let’s be honest; your body has entirely reasonable motives here. Blood glucose starts falling, cortisol steps in to mobilize stored glucose so that your brain stays supplied. That system kept our ancestors alive.

One thing it won’t do though is making you sharper.

You may believe skipping lunch keeps you locked in through the afternoon block. However what happens by 3pm is that you’re operating on stress hormones instead of food, and those two fuel sources deliver wildly different cognitive quality.

Where fasting fits (and where it doesn’t)

Worth being clear here, since our position on fasting gets twisted constantly.

I’ve done intermittent fasting myself and it moved the needle hard for me on weight loss, mental clarity and learning to control hunger instead of obeying it. Nothing about that makes it a golden ticket, and it absolutely doesn’t suit everyone.

Circumstances and past experience are the parts that almost everybody tends to skip: When I was doing it, I’d already built the parasympathetic activation work you can see broken down in our stress article into my day. Fasting on top of an already-calm nervous system behaves completely different than doing it on top of a constantly overstimulated, sympathetic one.

Same goes for the extended 24-72-hour fasts I do occasionally. A deliberate, planned fast in a rested body plays out as a completely different physiological event than accidentally skipping lunch on the fourth day of a brutal week.

Context decides whether the cortisol response works for or against you.

The ways you spike cortisol without eating a single thing

• Checking email first thing in the morning, before your CAR has even finished

• Doomscrolling in bed before you get up

• Back to back meetings with zero buffer between them

• A commute where you’re mentally still stuck in the last meeting

• Opening Slack at 11pm “just to check something”

Your calorie tracker will never catch a single one of these, and each of them eventually shows up on your midsection, with several turning up in your gut too, since cortisol weakens intestinal tight junctions and suppresses secretory IgA.

Eat at consistent times, protein-forward, with enough carbohydrate to hold blood glucose steady through your highest-demand blocks. Build 10-minute buffers between meetings where you can, and stop opening email before your feet touch the floor.

3) Poor Sleep

Sleep tops the list of what determines your cortisol curve, and it stays the last lever most men pull.

Nothing in the data here leaves room for argument.

A single night of partial sleep deprivation measurably reduces insulin sensitivity across multiple metabolic pathways in healthy subjects [4]. No accumulated debt required, one bad night is enough.

Extend that to a week and the hormonal cost widens considerably.

Researchers at the University of Chicago restricted healthy young men to under 5 hours nightly for 1 week and measured a 10-15% drop in daytime testosterone [5]. For context, testosterone declines roughly 1-2% per year with normal aging, so a single bad week cost these men the equivalent of a decade.

Once you string years of that together, your cortisol settles into a permanently flattened pattern, since your morning rise weakens every time your evening never properly ended.

Fixing sleep is the fastest lever available in this entire article, and it stays untouched in most cases until someone points at it directly.

Devin came to us at 45 with a sleep score of 58. 4 months later he was at 92+ and had dropped 22 lbs without ever counting a calorie.

The changes in his nutrition of course mattered, but repairing his sleep is what let those changes show up at all.

Room at 60-67°F, dark and quiet, consistent sleep and wake times including weekends, screens off or filtered well before bed (blue light blockers heavily recommended here).

Get tested for sleep apnea if you snore, carry extra weight, or wake unrefreshed regardless of duration, since none of the above will magically cure untreated sleep apnea, which is an entirely different animal (discussed in a later article).

On the compound side we’ve covered glycine, magnesium glycinate, apigenin, GABA and passionflower in their own pieces, worth looking into which ones are the most relevant for you ONCE you locked in the basics.

4) Training Too Hard, Too Late, With Zero Recovery

More hours in the gym stop paying off past a certain point and start costing you HEAVILY in cortisol.

2 separate things go wrong inside this habit, and they compound each other:

I. Timing

Exercise raises cortisol acutely, which is appropriate and part of how training works in the first place. Things go sideways when you schedule the spike at the exact hour your curve should be bottoming out.

A study comparing identical resistance sessions performed at 8am VS 6pm found a clear time-of-day effect. Morning sessions resulted in essentially no change from pre to post-exercise, at -2%, while evening sessions led to a 14% increase [6].

Same load and effort, but with an opposite hormonal direction. Your 9pm session keeps cortisol elevated right when it should be dropping for the night.

II. Recovery

When you stack hard sessions with zero rest days, you’re asking your nervous system to sprint a race it never gets to finish. The testosterone-to-cortisol ratio serves as the standard marker here, and a drop beyond 30% has long signalled overreaching rather than productive training.

You can spot it easily enough: Joints feeling worse than muscles, ANY sort of pain showing up during & after working out OTHER than muscle burn, sleep degrading on training days, injuries becoming more frequent (often written off as “aging”) and loads that stop progressing despite you showing up consistently and having your nutrition dialled in.

Train earlier where your schedule permits. If evening is your only window, cap the intensity and finish at least 3 hours before bed. Take proper rest days, meaning 2 per week minimum for most men past 40.

Our clients train anywhere from 2-4 times weekly depending on their schedule and what their body responds to best. One thing stays fixed regardless: No session ever exceeds 60 minutes, since that’s where the adaptation stops improving and your body starts paying the cortisol tax…And just like Uncle Sam is probably not your best friend when it comes to your finances, the same applies for your hormones as well.

5) Alcohol

Beyond what it does to testosterone (an entire article on its own), alcohol raises cortisol directly and NUKES the exact sleep stages your body needs to bring it back down overnight.

The Whitehall II cohort measured salivary cortisol across 3,670 men and women at multiple daily timepoints. In men, cortisol climbed in step with weekly alcohol units, and the same association held after adjusting for whether they’d consumed alcohol that same day, pointing at chronic HPA axis changes rather than just an acute effect [7].

So here it goes in practice:

→ Alcohol briefly suppresses cortisol, delivering the relaxation you were after → Several hours later cortisol rebounds above where it would have landed without the drink → The rebound typically arrives after the first two quarters of your sleep → The second half of your sleep gets fragmented. → The lack of quality sleep raises cortisol the following day → The entire day feels worse, making that evening drink (once again) more appealing…temporarily

Your glass of wine to unwind does the exact opposite of what most folks believe, and it does it on a delay long enough that the vast majority almost never connects the dots.

Listen, we’re not gonna lecture you on this one, whether you drink alcohol or not, whether the benefits outweigh the negative consequences for you is 100% your choice. You’re an adult person, we’re not going to tell you to quit drinking cold turkey. You should know how well you can keep the habit under control without becoming a full blown alcoholic. Some folks do it better than others, some never get addicted, while for some a single sip is enough to start spiraling into a limbo of hepatotoxicity and rehab phases constantly alternating each other.

We’re way more interested in talking placement instead. Our take is that IF you drink, you better do it earlier in the evening rather than right before bed, with food, potentially some NAC beforehand and with enough alcohol-free nights weekly that your sleep gets a chance to show you the difference. Most clients tracking this on a wearable don’t need any convincing anymore after the first 2 weeks.

6) Chronic Low-Carb Crash Dieting

When you cut carbs too hard for too long, your body has to manufacture glucose from your own muscle tissue to keep blood sugar stable. That process travels directly through cortisol every single time.

The thyroid data on this is where things get unsettling:

A 1986 study in Metabolism assigned subjects to either a high-carbohydrate or low-carbohydrate very-low-calorie protocol for 28 days, with exercise held constant across both groups. Serum T3, your active thyroid hormone, dropped in both groups. The low-carbohydrate group saw a 34.6% decline against 17.9% in the matched-calorie high-carbohydrate group [8].

Almost DOUBLE the thyroid suppression, at identical calories.

Where this bites you specifically

That “get serious” 2-week carb-free reset before a big event, wedding, beach trip, photoshoot, or keynote,

Where you’re picturing a leaner, sharper version of yourself walking into the room…yet it still fails for some “unknown” reason

We’ve watched this play out enough times to predict it.

Guy has 3 weeks before something that matters. He starts panicking, strips carbs to near zero, and arrives flat, depleted, moody, and looking worse on the event photos than he did at the start.

Then he spends 6 weeks refeeding a suppressed thyroid back to baseline. Those 3 weeks he was trying to optimize cost him closer to 9, and probably an extra 5-10 lbs in unwanted body weight.

Keep carbs in, particularly around training. Aggressive restriction earns its place in specific contexts under supervision, and 2 weeks before something that matters to you definitely does NOT make it to that list. You can absolutely get there while STILL eating enough carbs to not become an exhausted, short-tempered ball of stress. Our entire approach on this one lives here in the Metabolic Priming Manifesto.

7) Your Own Belly Fat

And finally here’s the one that explains why the previous 6 feel so impossible to escape once you’re deep enough in this.

Visceral fat (the fat packed around your organs instead of resting under your skin) contains an enzyme called 11β-HSD1 (11-beta-hydroxysteroid dehydrogenase type 1) that converts inactive cortisone into active cortisol directly inside the fat tissue.

Shortly your fat tissue produces its own supply of cortisol.

Researchers quantified this in living humans using deuterated cortisol infusion with blood sampling taken across adipose tissue. Cortisol release from fat tissue by 11β-HSD1 came back measurable, and enzyme expression increases in correlation with obesity, feeding whole-body cortisol regeneration [9].

Separate work confirmed that 11β-HSD1 gets transcriptionally upregulated in the adipose tissue of obese subjects, amplifying local glucocorticoid activation without necessarily raising circulating cortisol at all [10].

Why we call this INSIDIOUS: Your blood test can come back completely normal while the tissue around your organs bathes in “locally-sourced” cortisol.

The Insidious Loop

→ More visceral fat means more 11β-HSD1 activity → It leads to more locally produced cortisol → More local cortisol drives the accumulation of MORE visceral fat → 11β-HSD1 activity climbs even further

And around it goes, not giving a flying F about what’s on your plate.

This explains the guy doing everything right with food and training who still can’t drop the gut.

Nothing wrong with his discipline, since those fat cells simply keep producing the hormone that holds (and multiplies) them exactly where they are.

Until the loop breaks from the cortisol side, he can white-knuckle a deficit indefinitely and watch almost nothing happen around his midsection.

Everything in the previous 6 habits, applied together, is what breaks it. Visceral fat responds well to the combination of sleep optimization, increasing insulin sensitivity and reducing sympathetic load, which we covered in depth in our insulin resistance article.

This layer breaks last, but it DOES break (see the evidence below)

“But Coach, If Low Cortisol Is Not Always Good, What About Hair Loss?”

We get this question very often, and we can’t keep emphasizing that hair loss is an entirely different animal.

Worth addressing separately since the cortisol crowd oversimplifies it badly in both directions.

Chronic stress comes with persistently elevated cortisol, and that often pushes hair into telogen effluvium. In plain terms, follicles get forced out of the anagen (growth) phase prematurely and switch into shedding.

In a healthy scalp roughly 85% of follicles stay in anagen at any moment. Under significant sustained stress, up to 70% of anagen hair can precipitate into the telogen phase [11].

We see this not only in aging folks, but also in men well under 35, particularly first-time founders, newly promoted executives, and anyone inside the 18 months surrounding an exit or IPO. The hairline can EASILY recede to the back third of the scalp within half a decade.

But the keyword here is CHRONIC.

Your hair growth will NOT be affected by that ideal morning spike you’d want to consistently experience, followed by a steep decline (the diurnal slope mentioned earlier).

Your Cortisol has to be CONSTANTLY elevated (a.k.a Chronic Stress) for it to affect your scalp coverage AT ALL.

Furthermore Cortisol is just ONE factor among several, and it’s rarely the loudest one

Your hair typically won’t fall out purely “due to stress.”

Most often that stress component layers on top of androgenetic alopecia, driven by 5-alpha reductase converting testosterone into DHT (dihydrotestosterone). DHT binds androgen receptors in the follicle, shortens anagen, prolongs telogen, and miniaturizes the follicle progressively over years, entirely independent of your stress levels.

Another under-discussed contributor is elevated prolactin, which suppresses GnRH and testosterone while separately disrupting the follicle cycle, again with zero regard for your cortisol.

So if you’re losing hair and treating it as a stress issue alone, you’re addressing maybe a third of what’s happening. Get DHT and prolactin measured alongside your cortisol tests.

Why this matters in practice: Telogen effluvium reverses well once the stressor clears, while androgenetic miniaturization keeps progressing and stays time-sensitive. If you treat one while carrying the other you’ll end up burning the window where treatment still works.

Whether you’re considering transplants or trying to reverse the process while it’s still early, there’s a great deal you can do, and we mapped the full picture in our hair loss article.

Fixing Your Cortisol Curve In Practice

Now let’s pull all this together into something you can start tomorrow.

Phase 1: Get the whole curve on paper (week 1)

One morning cortisol reading tells you almost nothing. What you want is a 4-point salivary panel measuring waking, waking +30 minutes, afternoon and bedtime, which gives you the curve rather than a single dot on it. Very simple. You don’t need a lab for this one. You can order a salivary cortisol testing kit online at this very moment.

Alongside that, get the panel ruling out every other explanation: Thyroid with antibodies, testosterone with SHBG, fasting glucose and HbA1c, ferritin, and hs-CRP.

If your morning grogginess hits hard, that’s your suppressed CAR speaking, and it reshuffles the priority order of everything below.

Phase 2: Sharpen the morning (weeks 1-4)

→ Morning sunlight within 30 minutes of waking, 10-20 minutes, outdoors and without sunglasses

→ Delay the first coffee by 60-90 minutes so it lands after your CAR completes instead of blunting it

→ Protein-forward breakfast within 90 minutes of waking

→ Train in the morning where your schedule allows

Phase 3: Defend the evening (weeks 1-8)

→ Caffeine cutoff between noon and 4pm depending on how fast you clear it

→ Last hard training session finishing 3+ hours before bed

→ If you drink alcohol, do it earlier in the evening, with food, potentially with NAC and fewer nights weekly (or monthly)

→ Screens dimmed or off in the final hour (OR with blue light blockers on)

→ Breathwork at 5-6 breaths per minute for 5-10 minutes, covered fully in our stress article

Phase 4: Compound support (ongoing, once the behavior is in place)

Ashwagandha KSM-66 at 600mg daily, cycled 8 weeks on and 2-4 weeks off. L-Theanine at 200-400mg, pairing beautifully with whatever caffeine survives in your morning. GABA and magnesium glycinate in the evening.

Compounds accelerate a curve your behavior is already correcting. They accomplish very little against a schedule that keeps flattening it.

Sequence matters more than any single item on those lists.

Folks starting at Phase 4 since supplements feel easier than restructuring their evening reliably conclude that ashwagandha does nothing.

Ashwagandha does plenty. It simply cannot outrun a 9pm training session followed by two glasses of wine and 5 hours of fragmented sleep.

Quick Summary

→ Cortisol moves along a daily curve. Healthy means a sharp morning rise (the Cortisol Awakening Response) followed by roughly an 80% decline by bedtime. Flatter slopes correlated with worse outcomes across 10 of 12 health categories in meta-analysis, with the sharpest effects on inflammation and immune function.

→ Morning grogginess before 9am points at a suppressed awakening response. Chasing “low cortisol” as a goal makes that pattern worse.

→ Habit 1, caffeine past 4pm: Elevates cortisol for roughly 6 hours, and tolerance covers the morning dose while leaving your afternoon dose fully active.

→ Habit 2, skipping meals: 6+ hours without food triggers cortisol-mediated glucose mobilization. Email before your feet hit the floor, doomscrolling in bed, and zero-buffer meeting blocks accomplish the same thing without any food (or the lack of it) involved.

→ Habit 3, poor sleep: One night of partial deprivation measurably reduces insulin sensitivity. One week under 5 hours dropped testosterone 10-15% in healthy young men.

→ Habit 4, training too hard and too late: Identical sessions led to a 14% cortisol increase in the evening VS -2% in the morning. Stack that with no rest days and the T:C ratio tells the story.

→ Habit 5, alcohol: Raises cortisol on a delay, rebounds mid-sleep, fragments the second half of the night, and raises tomorrow’s baseline.

→ Habit 6, chronic low-carb crash dieting: T3 fell 34.6% on a low-carb very-low-calorie protocol against 17.9% at matched calories with carbohydrate retained.

→ Habit 7, your own visceral fat: 11β-HSD1 converts cortisone into active cortisol inside the fat tissue itself, creating a self-sustaining loop that operates independently of your food intake.

→ Hair loss involves cortisol via telogen effluvium, while DHT and prolactin usually carry more of the load. Measure all three.

Your Takeaway

Every symptom at the top of this article traces back to the same broken curve, which is exactly why fixing them one at a time never works.

You cannot out-supplement a flat cortisol slope, cannot out-train it, and certainly cannot out-diet it, which is the discovery most folks make somewhere around their fourth failed 12-week cut.

What you definitely CAN do is rebuild the shape. Sharp in the morning, low at night, with the habits above either steepening or flattening the slope. Nothing here demands more discipline than you already have, and most of it demands considerably less than what you’re currently doing.

The visceral fat loop keeps folks stuck longest, and it explains why your discipline has felt so poorly rewarded.

Your fat cells have been manufacturing the hormone that keeps them there, almost entirely separate from your nutrition. Your goal is to break the loop from the cortisol side and the body composition work you’ve already been doing finally starts to come to fruition

Fix the shape of your curve and the rest of your protocols stop fighting uphill.

If you’re a business owner or corporate executive looking to lose 20-50+ pounds following a complete & tailored system for your nutrition, sleep, training and metabolism that gets you lean and energetic

Without counting calories, eliminating entire food groups or training more than 2-3 hours/week,

Schedule Your Free Consult Today to see if we’re a great fit for working together 1-on-1.

Inside the Demi Cycle Protocol, we’ve now helped 100+ successful entrepreneurs & executives reclaim their bodies and their energy using our three pillars of Time Efficiency, Metabolic Priming, and Natural Accountability. You might just be the next one ;)

Until then,

Keep it Lean & Energetic!

Best,

Coach Abris

Check out more about what we do HERE 💪

More ways we can help you Drop fat and optimize your metabolism:

Ready to shred fat and boost your energy levels sustainably? Book a free 1-on-1 Strategy Call and discover how our systems can help you achieve a lean & energetic physique without counting calories or spending hours in the gym. We’ll build you a plan that fits your lifestyle and goals and hold you accountable with our tailored 1:1 coaching 💪 Apply Here

Disclaimer: This article is for educational purposes only and is not medical, legal, or financial advice. Cortisol testing and interpretation should be conducted with a qualified physician, and persistent symptoms warrant proper endocrine evaluation to rule out Cushing’s syndrome, adrenal insufficiency, and other conditions requiring medical treatment. Never discontinue prescribed medications without medical supervision.

References

[1] Adam EK, Quinn ME, Tavernier R, McQuillan MT, Dahlke KA, Gilbert KE. Diurnal cortisol slopes and mental and physical health outcomes: A systematic review and meta-analysis. Psychoneuroendocrinology. 2017;83:25-41. https://pubmed.ncbi.nlm.nih.gov/28578301/

[2] Lovallo WR, Whitsett TL, al’Absi M, Sung BH, Vincent AS, Wilson MF. Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosom Med. 2005;67(5):734-739. https://pubmed.ncbi.nlm.nih.gov/16204431/

[3] Lovallo WR, Farag NH, Vincent AS, Thomas TL, Wilson MF. Cortisol responses to mental stress, exercise, and meals following caffeine intake in men and women. Pharmacol Biochem Behav. 2006;83(3):441-447. https://pubmed.ncbi.nlm.nih.gov/16631247/

[4] Donga E, van Dijk M, van Dijk JG, et al. A single night of partial sleep deprivation induces insulin resistance in multiple metabolic pathways in healthy subjects. J Clin Endocrinol Metab. 2010;95(6):2963-2968. https://pubmed.ncbi.nlm.nih.gov/20371664/

[5] Leproult R, Van Cauter E. Effect of 1 week of sleep restriction on testosterone levels in young healthy men. JAMA. 2011;305(21):2173-2174. https://pubmed.ncbi.nlm.nih.gov/21632481/

[6] The differential hormonal milieu of morning versus evening may have an impact on muscle hypertrophic potential. PLoS One. 2016. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5008805/

[7] Badrick E, Bobak M, Britton A, Kirschbaum C, Marmot M, Kumari M. The relationship between alcohol consumption and cortisol secretion in an aging cohort. J Clin Endocrinol Metab. 2008;93(3):750-757. https://pubmed.ncbi.nlm.nih.gov/18073316/

[8] Mathieson RA, Walberg JL, Gwazdauskas FC, Hinkle DE, Gregg JM. The effect of varying carbohydrate content of a very-low-caloric diet on resting metabolic rate and thyroid hormones. Metabolism. 1986;35(5):394-398. https://pubmed.ncbi.nlm.nih.gov/3702673/

[9] Stimson RH, Andersson J, Andrew R, et al. Cortisol release from adipose tissue by 11beta-hydroxysteroid dehydrogenase type 1 in humans. Diabetes. 2009;58(1):46-53. https://pubmed.ncbi.nlm.nih.gov/18852329/

[10] Rask E, Walker BR, Söderberg S, et al. Local and systemic impact of transcriptional up-regulation of 11beta-hydroxysteroid dehydrogenase type 1 in adipose tissue in human obesity. J Clin Endocrinol Metab. 2002;87(7):3330-3336. https://pubmed.ncbi.nlm.nih.gov/12915696/

[11] Hughes EC, Syed HA, Saleh D. Telogen Effluvium. StatPearls. Treasure Island (FL): StatPearls Publishing.

This time we’re covering an adaptogen that (surprisingly) isn’t a plant at all, and that single difference changes everything about how it works inside you.

Every adaptogen we’ve profiled so far came from the plant kingdom, working through plant secondary metabolites on your nervous and endocrine systems: Withanolides from Ashwagandha on your HPA axis, rosavins and salidroside from Rhodiola Rosea on your mitochondria, eugenol and ursolic acid from Holy Basil across your whole stress-response system.

Today’s adaptogen though enters your body through a completely different door, since your immune cells carry dedicated receptors that recognize fungal cell walls and nothing else.

We’re talking about Reishi (Ganoderma lucidum), known as Lingzhi in China and Reishi in Japan, a woody shelf mushroom used across East Asian medicine for more than 2,000 years and historically reserved for emperors under names like “the herb of immortality” and “the mushroom of spiritual potency.”

The multi-functionality here traces to two separate bioactive families working through two separate pathways:

• β-glucans (polysaccharides) that bind directly to immune-cell receptors

• Triterpenoids (ganoderic acids) that act on inflammation, liver enzymes & the nervous system

Human trials have measured effects on:

• fatigue & sense of well-being

• immune cell populations & NK cell activity

• inflammatory markers

• blood lipids & liver enzymes

• exercise recovery & oxygen-carrying capacity

What separates Reishi from every other adaptogen in this series comes down to the entry point: Your innate immune system evolved dedicated pattern-recognition receptors for fungal β-glucans. Reishi skips the blood-brain barrier and the hormone axis entirely, binding instead to receptors your body already built for it.

However evidence base also has a hole in it that most Reishi sellers would rather you never stumbled across. We’ll get to that one too.

Let’s get into the mechanisms first:

How It Works

Binding Directly To Your Immune Receptors

This is the primary mechanism and the one that separates a mushroom from every plant adaptogen we’ve covered.

Your innate immune system deploys pattern-recognition receptors, proteins built specifically to identify molecular signatures that only appear on microbes and fungi. Two of them plays a role here: Dectin-1 and Toll-like receptors (TLRs), both of which recognize β-1,3/1,6-D-glucan, the structural polysaccharide making up fungal cell walls.

When Reishi β-glucans bind those receptors, they trigger signal transduction that primes macrophages, natural killer cells & cytotoxic T-cells without an infection being present. Your immune system gets a training signal instead of a stimulant.

A 2023 randomized, double-blind, placebo-controlled trial by Chen et al. gave healthy adults aged 18-55 either Reishi β-glucan or placebo daily for 84 days, with bloodwork at both ends. The Reishi group showed significant increases across:[2]

• CD3+, CD4+ & CD8+ T-lymphocytes

• The CD4/CD8 ratio (a general marker of immune balance)

• Natural killer cell counts

• NK cell cytotoxicity (functional killing capacity, not just cell numbers)

• Serum immunoglobulin A (IgA, your mucosal antibody defence)

That last pair carries more weight than the raw numbers. NK cytotoxicity measures whether those cells perform, and IgA controls the barrier defence at your gut, airways & mouth where most pathogens arrive.

This is what “immunomodulation” means when it’s measured properly rather than claimed on a label. Reishi raised both the population and the function of multiple immune cell types across 84 days in healthy volunteers, without pushing any single arm out of balance.

For immune foundation purposes, this puts Reishi alongside Zinc, Vitamin D3 & Selenium in a different role: Those three supply raw materials while Reishi supplies the training signal.

Cutting Through Your Fatigue

The strongest human trial on Reishi targets exactly the symptom most ambitious men over 40 walk around with.

A 2005 randomized, double-blind, placebo-controlled trial by Tang et al. enrolled 132 patients with neurasthenia, a clinical diagnosis characterised by persistent fatigue, poor concentration & reduced capacity for mental work. Participants received a Reishi polysaccharide extract at 1,800mg three times daily for 8 weeks.[1]

Across the 123 assessable patients:

• Sense of fatigue dropped 28.3% from baseline vs 20.1% on placebo

• Clinical Global Impression severity dropped 15.5% vs 4.9% on placebo

• Sense of well-being rose 38.7% vs 29.7% on placebo

• 51.6% of the Reishi group rated as more than minimally improved vs 24.6% on placebo

That last figure translates most directly into something you’d notice. Twice as many people crossed the threshold of noticing a difference.

A separate 2012 pilot trial by Zhao et al. randomized 48 breast cancer patients experiencing treatment-related fatigue to Reishi spore powder (1,000mg three times daily) or control for 4 weeks. The Reishi group showed statistically significant improvements in physical well-being & the fatigue subscale, alongside less anxiety, less depression & better quality of life, with TNF-α and IL-6 significantly lower after treatment.[3]

A “small” detail worth paying attention to: That second trial took place in a cancer population and we’re citing it for the fatigue and inflammatory-marker findings primarily. Reishi is still actively being researched as a potential cancer cure, but it is not a cancer treatment in itself and we’d suggest you read nothing in this article that way beyond experimental hypothesis or early stage development at best.

Calming Your Inflammation

Reishi’s triterpenoids (the ganoderic acid family) carry the anti-inflammatory workload, operating through pathways we’ve mapped repeatedly across this series.

The mechanism operates through:

→ NF-κB downregulation (the master inflammatory transcription factor, same target as Curcumin)

→ MAPK & TLR-4 signalling suppression

→ Reduced TNF-α, IL-1β & IL-6 production

→ Increased antioxidant enzyme activity (SOD, catalase, glutathione)

A 2026 systematic review by Pozzobon et al. examined 23 studies on Reishi triterpenes and reported that every one showed significant anti-inflammatory effects, primarily through downregulation of MAPK and TLR-4/NF-κB signalling.[9]

A limitation worth naming directly: That review covered in vitro and animal studies exclusively, with clinical trials deliberately excluded from the analysis. The human confirmation comes from the Zhao trial’s TNF-α and IL-6 reductions, which is a single small pilot. Lab work has characterised the mechanism thoroughly, while human confirmation stays thin.

Supporting Your Liver

Reishi’s liver story cuts both ways, and both halves deserve stating.

The supportive side: Multiple animal studies show ganoderic acids protecting against alcohol-induced and chemically-induced liver injury, reducing ALT and AST elevation, limiting hepatic lipid accumulation & improving liver antioxidant status.

A 2025 randomized, double-blind, placebo-controlled trial by Wang et al. on 110 subjects with dyslipidaemia tested Reishi spore oil over 12 weeks and measured significant improvements in markers of liver function alongside the lipid changes we’ll cover below, with no notable effects on kidney function.[7]

The other side: Human case reports of Reishi-associated liver injury exist in the medical literature, including a 2025 case published through the American College of Gastroenterology. The incidence appears very low and causality in herbal supplement cases is notoriously difficult to establish, particularly since contamination and adulteration confound the picture.

Our honest perspective on liver effects: Animal work documents the protective mechanisms thoroughly, and one human trial showed improved liver markers. Rare injury reports also exist. Practically speaking, existing liver conditions, hepatotoxic medications or high doses long-term all warrant periodic liver enzyme monitoring. That’s a rather simple insurance on a compound with an otherwise strong safety record.

Improving Your Blood Lipids?

The 2025 Wang et al. trial we mentioned above showed Reishi spore oil significantly reducing total cholesterol, LDL & triglycerides while raising HDL across 12 weeks in 110 dyslipidaemic subjects.[7]

That result deserves a heavy asterisk though, and the next section explains why in full. Shortly a higher-quality trial using a different Reishi preparation found nothing at all on the same class of markers, and our honest position is that preparation type appears to matter a ton and the picture stays unresolved.

For anyone specifically targeting cholesterol, Citrus Bergamot and Omega-3 carry far stronger and more consistent evidence than Reishi does.

Speeding Up Your Training Recovery

A 2025 systematic review and meta-analysis by Shu et al. pooled 14 randomized controlled trials on fungal supplementation in adult athletes. The Reishi findings came out consistent across studies:[6]

• Blood urea nitrogen significantly reduced (p < 0.00001), a marker of protein breakdown & training stress

• Blood lactate significantly reduced (p < 0.00001)

• Haematocrit significantly increased (p < 0.00001)

• Haemoglobin significantly elevated (p < 0.00001) across both triterpenoid & polysaccharide extracts, with stronger effects in endurance athletes

• Superoxide dismutase activity increased (p = 0.01)

Lower lactate and lower blood urea nitrogen point at faster clearance of training byproducts, while higher haemoglobin and haematocrit point at improved oxygen-carrying capacity. For an ambitious man over 40 training 3-4 times a week and feeling the recovery window stretch longer every year, that combination addresses the practical bottleneck.

Quick calibration before we move on: Most of these underlying trials come from Chinese-language sports science literature with modest sample sizes, and the meta-analysis authors flagged heterogeneity across study designs. The direction of effect holds consistent across studies, while the magnitude stays uncertain.

Sleep & Relaxation?

Reishi holds a 2,000-year reputation as a calming, sleep-promoting mushroom, and the traditional use goes back millennia. The modern evidence comes in thinner than the reputation suggests.

A 2021 study published in Scientific Reports found that the acidic fraction of Reishi mycelium extract shortened sleep latency and prolonged sleeping time in mice, working through a gut microbiota-dependent, serotonin-involved pathway. The extract raised hypothalamic 5-hydroxytryptamine levels and enriched beneficial gut bacteria including Bifidobacterium.[8]