Billionaire Brian Johnson Diagnosed With Chronic Autoimmune Gastritis Despite Healthy Lifestyle

American entrepreneur Brian Johnson, known for his rigorous anti-aging lifestyle and multimillion-dollar investments in longevity research, has been diagnosed with chronic autoimmune gastritis. Despite undergoing extensive regular medical tests and adhering to a strict regimen that includes taking dozens of dietary supplements daily, Johnson revealed on his X account that his stomach was essentially "eating itself." The official diagnosis came in May, uncovering that medical signs present for over a decade were early indicators of the disease, in which the immune system attacks stomach cells.

Johnson, 46, experienced extremely low iron stores for more than 11 years. Although he maintained a healthy diet and routine blood tests showed no anemia, his iron levels continued to decline despite treatment. This prompted his medical team to conduct in-depth tests and biopsies, which confirmed the autoimmune condition. Raised in a Mormon community in Utah and a former missionary in Ecuador, Johnson founded the payment company Braintree, later sold to PayPal for $800 million.

After a personal crisis and weight issues in his early 30s, Johnson dedicated his life and fortune to combating aging. His "Blueprint" project involves a team of about 30 doctors and scientists who monitor him closely. He calls himself "the most measured man in history," undergoing near-daily tests to reduce his biological age. Recently, he experimented with plasma transfusions from his son as part of his efforts to slow aging.