'Don't Die' Guy Bryan Johnson Says He Has Serious Autoimmune Disease

Bryan Johnson, the life extension guru who chronicles his efforts to reduce his “biological age,” says he has Autoimmune Gastritis (AIG), an incurable disease that he only discovered he had in May. Johnson wrote on X that he doesn’t know how long he’s actually had AIG, which causes B12 and iron deficiency, leading to anemia. But he’s vowing to work on “experimental approaches” to find a cure and has asked anyone working on the disease to reach out. Johnson, who’s 48 years old and constantly chronicling his efforts to maximize his health online, blamed his AIG on unhealthy foods he ate in his youth, along with the stress that came with being a father. “As a kid, I ate sugar cereal, drank sugary soda, and gobbled down fast food. I had a few healthy years in my early 20s but then became a young father of three and began building a business,” wrote Johnson. “Juggling that stress and grind, I let my health slip and gained 40 lbs. Within a few years I’d fallen into a deep, chronic depression. Somewhere in that timeline, my body began developing an autoimmune process affecting my thyroid and then my stomach lining,” Johnson continued. I have an autoimmune disease. My stomach is eating its