Bryan Johnson Reveals Autoimmune Gastritis Diagnosis, Saying 2%-5% May Also Have It

3 articles · Updated · The Indian Express · Jul 1

May 2026 brought Johnson’s diagnosis of autoimmune gastritis, a condition he said had been silently damaging his stomach lining without obvious symptoms.
11 years of low ferritin that resisted diet changes and iron supplements helped explain the discovery, alongside his earlier hypothyroidism diagnosis at age 21.
Doctors cited in the report said autoimmune gastritis often hides for years, can reduce vitamin B12 and iron absorption, and may raise long-term cancer risk.
Experts added there is no known cure; treatment centers on monitoring, correcting nutrient deficiencies, and watching patients with related autoimmune disorders such as thyroid disease.

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