<![CDATA[Sarah's Substack]]>https://sarahfuncnutritionist.substack.comhttps://substackcdn.com/image/fetch/$s_!wgWJ!,w_256,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F2db0a453-82e8-4feb-87dd-852f4bc54103_700x700.pngSarah's Substackhttps://sarahfuncnutritionist.substack.comSubstackFri, 04 Sep 2026 08:44:33 GMT<![CDATA[Low Ferritin: Why Your Iron Stays Low and How to Raise It]]>https://sarahfuncnutritionist.substack.com/p/low-ferritin-why-your-iron-stayshttps://sarahfuncnutritionist.substack.com/p/low-ferritin-why-your-iron-staysThu, 20 Aug 2026 01:47:39 GMTLow ferritin is one of the most common lab findings I see, especially in menstruating women, and it is also one of the most commonly under-treated. It can drive fatigue, hair shedding, weakness, brain fog, feeling cold all the time, headaches, dizziness, shortness of breath, and restless legs.

The part most people miss is this: you can have low iron stor…

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]]><![CDATA[Your Body Is One System: Why a Systems Biology Approach Is the Only Way to Truly Heal]]>https://sarahfuncnutritionist.substack.com/p/your-body-is-one-system-why-a-systemshttps://sarahfuncnutritionist.substack.com/p/your-body-is-one-system-why-a-systemsMon, 03 Aug 2026 17:18:43 GMTYou cut out gluten and dairy. You took the probiotic, prebiotic the L-glutamine, the herbal antimicrobials. You did the elimination diet, then the reintroduction, then the elimination again when the bloating came back.

So you assume the protocol failed. Or worse, that your body failed.

Neither is true. What actually happened is that the protocol was aimed…

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]]><![CDATA[You’ve Tried Everything for Your Anxiety. Here’s the Piece No One Told You About.]]>https://sarahfuncnutritionist.substack.com/p/youve-tried-everything-for-your-anxietyhttps://sarahfuncnutritionist.substack.com/p/youve-tried-everything-for-your-anxietyWed, 01 Jul 2026 19:41:42 GMT

You’ve talked it through. Maybe you’ve tried the medication. You’ve downloaded the meditation app, read the books, done the breathing exercises someone swore would fix everything.

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.

And still, there it is. That low hum o…

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]]><![CDATA[Why Your Gut Supplements Aren’t Working: The Missing Pieces of Gut Healing]]>https://sarahfuncnutritionist.substack.com/p/why-your-gut-supplements-arent-workinghttps://sarahfuncnutritionist.substack.com/p/why-your-gut-supplements-arent-workingWed, 17 Jun 2026 13:06:09 GMT

A Functional Medicine Perspective on IBS, Bloating, Constipation, and Microbiome Recovery

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]]><![CDATA[Your Symptoms Aren’t Random. They Have a Root Cause.]]>https://sarahfuncnutritionist.substack.com/p/your-symptoms-arent-random-they-havehttps://sarahfuncnutritionist.substack.com/p/your-symptoms-arent-random-they-haveTue, 16 Jun 2026 13:05:28 GMT

Take the 2-minute Root Cause Quick Scan and find out what your body has been trying to tell you.

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.

Free 2-Minute Root Cause Scan!

You’ve been told it’s “just stress.” Or “just aging.” Or that your labs came back “normal,” so there’s nothing to worry a…

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]]><![CDATA[Why Am I Always Tired? 12 Overlooked Root Causes of Chronic Fatigue]]>https://sarahfuncnutritionist.substack.com/p/why-am-i-always-tired-12-overlookedhttps://sarahfuncnutritionist.substack.com/p/why-am-i-always-tired-12-overlookedMon, 15 Jun 2026 13:16:01 GMTWhen “Getting More Sleep” Isn’t Enough

If you feel exhausted no matter how much you sleep, you are not lazy, unmotivated, or simply “getting older.”

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.

Persistent fatigue is one of the most common health complaints, yet ma…

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]]><![CDATA[Hashimoto’s and Weight Gain: Why You Can’t Lose Weight Even When You’re Doing Everything Right]]>https://sarahfuncnutritionist.substack.com/p/hashimotos-and-weight-gain-why-youhttps://sarahfuncnutritionist.substack.com/p/hashimotos-and-weight-gain-why-youWed, 10 Jun 2026 18:25:59 GMT

Few symptoms are more frustrating than gaining weight despite eating well, exercising consistently, and doing everything you’ve been told should work.

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]]><![CDATA[What to Eat with Hashimoto’s Thyroiditis]]>https://sarahfuncnutritionist.substack.com/p/what-to-eat-with-hashimotos-thyroiditishttps://sarahfuncnutritionist.substack.com/p/what-to-eat-with-hashimotos-thyroiditisSun, 24 May 2026 21:34:44 GMT

If you’ve been diagnosed with Hashimoto’s thyroiditis, you’ve probably been told to take medication and monitor your TSH levels. But what most practitioners don’t tell you is that what you eat every single day has a profound impact on your thyroid antibodies, your symptoms, and your quality of life.

Hashimoto’s is an autoimmune condition, affecting the t…

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]]><![CDATA[The Real Root Cause of Your Autoimmune Disease (And Why Your Doctor Has Never Mentioned It)]]>https://sarahfuncnutritionist.substack.com/p/the-real-root-cause-of-your-autoimmunehttps://sarahfuncnutritionist.substack.com/p/the-real-root-cause-of-your-autoimmuneMon, 11 May 2026 20:42:10 GMT

By Sarah Khan, PhD Integrative & Functional Nutritionist

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.

Let me ask you something.

You’ve probably been told your autoimmune disease is a case of your immune system “attacking itself.” You’ve been given medications to s…

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]]><![CDATA[Why So Many Women with Autoimmune Disease Still Feel Sick Even After “Doing Everything Right”]]>https://sarahfuncnutritionist.substack.com/p/why-so-many-women-with-autoimmunehttps://sarahfuncnutritionist.substack.com/p/why-so-many-women-with-autoimmuneWed, 06 May 2026 00:48:42 GMTYou’ve cleaned up your diet.
You’ve tried the supplements.
You’ve seen the specialists.
Your labs may even come back “normal.”

And yet, you still feel exhausted, inflamed, foggy, bloated, reactive, or disconnected from your body.

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid sub…

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]]><![CDATA[How to Heal Your Gut and Calm Autoimmunity Naturally]]>https://sarahfuncnutritionist.substack.com/p/how-to-heal-your-gut-and-calm-autoimmunityhttps://sarahfuncnutritionist.substack.com/p/how-to-heal-your-gut-and-calm-autoimmunityWed, 22 Apr 2026 20:18:12 GMTWhy Your Gut Is the Key to Calming Your Autoimmune Disease (And What to Actually Do About It)

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]]><![CDATA[The Root-Cause Reset Integrated Functional Nutrition & Acupuncture]]>https://sarahfuncnutritionist.substack.com/p/the-root-cause-reset-integrated-functionalhttps://sarahfuncnutritionist.substack.com/p/the-root-cause-reset-integrated-functionalTue, 10 Mar 2026 14:25:26 GMTHi everyone,

One of the most common things I hear from people is this:

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.

“I feel like I’m doing everything right, but my body still feels stuck.”

They are eating well.
They are exercising.
They are managing stress as best th…

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]]><![CDATA[Struggling with Autoimmune Disease, Start here! ]]>https://sarahfuncnutritionist.substack.com/p/struggling-with-autoimmune-diseasehttps://sarahfuncnutritionist.substack.com/p/struggling-with-autoimmune-diseaseMon, 02 Mar 2026 04:10:40 GMTIf you’re navigating Autoimmune Disease, you already know it’s rarely just about one lab value or one organ.

Enroll Here!

It’s not “just thyroid.”
Not “just joints.”
Not “just skin.”

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.

Autoimmune disease reflects system-wide immune dysr…

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]]><![CDATA[Why Autoimmune Disease Requires a Whole-Body Approach (And Why So Many People Are Still Missing It)]]>https://sarahfuncnutritionist.substack.com/p/why-autoimmune-disease-requires-ahttps://sarahfuncnutritionist.substack.com/p/why-autoimmune-disease-requires-aTue, 17 Feb 2026 16:35:21 GMTIf you’re living with autoimmune symptoms, you’ve probably experienced some version of this:

You’re told your immune system is attacking your body.
You’re given medication to suppress the immune response.
And yet… you’re left wondering why your body started doing this in the first place.

Sarah's Substack is a reader-supported publication. To receive new pos…

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]]><![CDATA[Mind-Body Anti-Inflammatory Reset!]]>https://sarahfuncnutritionist.substack.com/p/mind-body-anti-inflammatory-resethttps://sarahfuncnutritionist.substack.com/p/mind-body-anti-inflammatory-resetFri, 02 Jan 2026 19:07:58 GMT

If you’ve tried eating anti-inflammatory, taking supplements, and “doing all the right things” but still feel inflamed, exhausted, anxious, or stuck, this matters:

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.

Chronic inflammation is often not driven by deficiency.

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]]><![CDATA[Why Chronic Stress Becomes Inflammation (and Why Diet Alone Isn’t Enough)]]>https://sarahfuncnutritionist.substack.com/p/why-chronic-stress-becomes-inflammationhttps://sarahfuncnutritionist.substack.com/p/why-chronic-stress-becomes-inflammationThu, 18 Dec 2025 00:47:36 GMTFor many people struggling with chronic inflammation—autoimmune disease, gut dysfunction, hormonal imbalance, persistent fatigue—the focus is often placed exclusively on food, supplements, and labs. While these are foundational, they are not sufficient on their own.

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]]><![CDATA[A 4-Week Virtual Anti-Inflammatory Mind-Body Reset (Enrollment Open)]]>https://sarahfuncnutritionist.substack.com/p/a-4-week-virtual-anti-inflammatoryhttps://sarahfuncnutritionist.substack.com/p/a-4-week-virtual-anti-inflammatoryWed, 17 Dec 2025 20:46:30 GMTHi there,

If you’ve been dealing with chronic stress, inflammation, gut issues, hormone imbalance, or feeling constantly “wired but exhausted,” this is for you.

Sarah's Substack is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber.

Elyse and I are excited to officially open enrollment for …

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]]><![CDATA[Mitochondrial Health: The Hidden Key to Fatigue, Brain Fog, and Low Energy]]>https://sarahfuncnutritionist.substack.com/p/mitochondrial-health-the-hidden-keyhttps://sarahfuncnutritionist.substack.com/p/mitochondrial-health-the-hidden-keyWed, 03 Dec 2025 14:31:09 GMTWhat Exactly Are Mitochondria?

Mitochondria are double-membrane-bound organelles found in nearly every cell of the human body. Often called the “powerhouses of the cell,” their most well-known function is producing ATP (adenosine triphosphate), the molecule that stores and transfers energy for nearly every biological process.

But modern research shows tha…

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]]><![CDATA[The Hidden Impact of Endocrine Disruptors: How They Affect Your Hormones, Metabolism, Fertility, and Long-Term Health]]>https://sarahfuncnutritionist.substack.com/p/the-hidden-impact-of-endocrine-disruptorshttps://sarahfuncnutritionist.substack.com/p/the-hidden-impact-of-endocrine-disruptorsTue, 18 Nov 2025 14:33:37 GMTEndocrine disruptors have become one of the most significant yet most overlooked drivers of hormonal imbalance, autoimmune activation, metabolic dysfunction, and chronic disease. Scholarly research and leading functional medicine practitioners have repeatedly emphasized how environmental toxins are an underappreciated root cause of symptoms such as fati…

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]]><![CDATA[The Critical Role of Vitamin D In Your Health ]]>https://sarahfuncnutritionist.substack.com/p/the-critical-role-of-vitamin-d-inhttps://sarahfuncnutritionist.substack.com/p/the-critical-role-of-vitamin-d-inFri, 14 Nov 2025 20:22:13 GMTVitamin D is one of the most underrated nutrients in modern healthcare, yet it plays a profound role in immunity, inflammation, hormone balance, metabolism, mood, and the prevention of long-term diseases.
For women, especially those navigating autoimmune diseases, thyroid imbalances, fatigue, stubborn inflammation, or recurrent infections, vitamin D is f…

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