
Longevity Pioneer Bryan Johnson Diagnosed with Autoimmune Gastritis, Upending Nutrient-Absorption Strategy
Tech entrepreneur Bryan Johnson revealed he has autoimmune gastritis (AIG), an autoimmune attack on the stomach’s parietal cells that reduces acid and intrinsic factor, impairing iron and B12 absorption. Diagnosed recently, the condition threatens his nutrient balance and longevity regimen, as iron deficiency can occur without anemia, and there’s a heightened risk of gastric cancer over time. There is no cure; management involves monitoring, supplementation, and regular checks. Johnson is pursuing IV iron, advanced immune testing, and experimental approaches as part of his ongoing health optimization.










