American tech entrepreneur Bryan Johnson announced on Thursday, July 2, 2026, that he has been diagnosed with autoimmune gastritis.
The condition was discovered after months of medical evaluations for a long-term iron deficiency.
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The 48-year-old longevity enthusiast, who spends approximately US$2 million annually on anti-aging treatments, learned of the chronic condition in May 2026.
His medical team conducted multiple tests, blood biomarkers, and biopsies to reach the diagnosis.
Autoimmune gastritis causes the body's immune system to attack the stomach lining.
This can lead to severe nutrient deficiencies and an increased risk of gastric cancer if left untreated.
According to the Global Autoimmune Institute, the disease affects between 0.5% and 4.5% of adults worldwide.
Johnson noted that estimates range from 2% to 5% because the condition often remains hidden without early symptoms.
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Experimental Treatment Plan
Johnson stated that his medical team intends to bypass standard management protocols.
They plan to deploy experimental treatments, including AI-designed antibodies, to attempt to reset the immune cells targeting his stomach lining.
Medical professionals, including autoimmune specialist Justin Janoska and physician Dr. Bradley Campbell, publicly noted that constant biohacking and testing can contribute to chronic physical stress.
They urged the consideration of emotional wellbeing.
Johnson, who previously founded Braintree and Kernel, plans to continue documenting his experimental medical journey publicly.
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He maintains his strict daily routine of supplements, exercise, and a specialized plant-based diet.
