149: Bryan Johnson's Disease Has Nothing to Do With Diet
Bryan Johnson was diagnosed with autoimmune gastritis in 2026, and within a day the internet had already decided it was his vegan diet — I don't think it's that simple.
In this episode I break down what autoimmune gastritis actually is, why Bryan's own data (crashed ferritin, failed iron absorption, a second autoimmune condition since he was 21) points to something deeper than food alone, and why both sides of this argument — "it's the diet" and "diet has nothing to do with it" — are missing the real pattern.
I walk through the genetics-plus-environment framework behind autoimmune disease, compare Bryan's lifestyle against how humans have lived for most of our history — sun exposure, food sourcing, community, caloric rhythm — and lay out the specific changes I'd make instead, most of which don't cost you anything. If you've ever wondered whether optimizing your health can go too far, this one's for you.
Thank you to this episode’s sponsor, Peluva!
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Learn More:
2: 8 Key Primal Shifts for Ancestral Living: https://www.primalshiftpodcast.com/8-key-primal-shifts-for-ancestral-living/
59: Paleo, Keto, Carnivore [Navigating Dietary Changes as a Family]: https://www.primalshiftpodcast.com/59-paleo-keto-carnivore-navigating-dietary-changes-as-a-family/
In this episode:
00:00 Intro
02:37 Health optimization gone too far
03:02 Diagnosis facts and markers
06:08 Genes, diet, and autoimmunity
08:32 What we know and don't
10:28 Against nature comparison
13:45 Risk factors with data
15:34 Ferritin red flags
17:47 A better primal blueprint
19:33 Final thoughts
Find me on social media for more health and wellness content:
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Website: https://michaelkummer.com/
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Pinterest: https://www.pinterest.com/michaelkummer/
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Twitter/X: https://twitter.com/mkummer82
[Medical Disclaimer]
The information shared on this video is for educational purposes only, is not a substitute for the advice of medical doctors or registered dietitians (which I am not) and should not be used to prevent, diagnose, or treat any condition. Consult with a physician before starting a fitness regimen, adding supplements to your diet, or making other changes that may affect your medications, treatment plan, or overall health.
[Affiliate Disclaimer]
I earn affiliate commissions from some of the brands and products I review on this channel. While that doesn't change my editorial integrity, it helps make this channel happen. If you’d like to support me, please use my affiliate links or discount code.