Bryan Johnson Diagnosed with Autoimmune Gastritis

American entrepreneur and bio‑hacker Bryan Johnson, 48, announced via social media that he has been diagnosed with autoimmune gastritis, a chronic inflammatory condition in which the immune system attacks the stomach lining. The diagnosis followed years of low ferritin levels and a series of blood tests, endoscopy and biopsies that showed early atrophy of acid‑producing cells. Johnson, who has spent millions on longevity protocols and is known for his "Don’t Die" regimen, also has a history of autoimmune thyroid disease diagnosed at age 21. He described the condition as his stomach “eating itself” and pledged to sequence a million of his immune cells to identify the rogue antibodies, with the aim of developing a cure that could be shared publicly. Autoimmune gastritis affects up to 2‑4 % of the population, can lead to iron and vitamin B12 deficiencies, anemia and an elevated risk of stomach cancer. There is no cure; treatment typically involves lifelong iron and B12 supplementation. Johnson’s public disclosure has drawn attention to the disease’s difficulty of diagnosis and his intention to use his resources to advance research for the wider community.