Bryan Johnson Diagnosed With Rare Autoimmune Stomach Disease, Shares Health Update - Video

Tech entrepreneur and longevity enthusiast Bryan Johnson has revealed that he has been diagnosed with autoimmune gastritis (AIG), a rare condition in which the immune system mistakenly attacks the stomach lining. The 48-year-old, known for spending millions on anti-ageing therapies, said years of unexplained low iron levels led to extensive testing, including endoscopy, blood tests and biopsies, which confirmed the diagnosis. Johnson said his iron deficiency has been corrected with intravenous iron, but there is currently no cure for the disease, according to an NDTV report.

Johnson said his team will closely monitor the condition while exploring experimental immune-based therapies, including AI-designed antibodies that may target harmful immune cells. He also reflected on his unhealthy lifestyle during his younger years, saying chronic stress and poor diet may have contributed to his health problems. Doctors explain that autoimmune gastritis gradually damages acid-producing stomach cells, leading to iron and vitamin B12 deficiency. Treatment mainly focuses on correcting nutritional deficiencies, monitoring complications and managing symptoms.