Former Kernel CEO and self-proclaimed 'Biohacker,' Bryan Johnson has spent years trying to slow aging through meticulous health tracking, experimental therapies, and a multimillion-dollar wellness regimen. "I have an autoimmune disease. My stomach is eating itself," Johnson wrote on X, adding he plans to try to solve it. The diagnosis: autoimmune gastritis, a chronic condition in which the immune system destroys the stomach's acid-producing cells.
The 48-year-old founded the longevity brand, and what he calls a religion, Don't Die, is also known for taking extreme measures, such as receiving blood plasma transfusions from his teenage son. His diagnosis surfaced after a routine colonoscopy at age 48, despite years of obsessive biological monitoring. Experts say the case is drawing welcome attention to a disease that's notoriously difficult to catch.
