Biohacker and tech entrepreneur Bryan Johnson recently revealed a diagnosis of autoimmune gastritis, a condition where the immune system attacks the stomach lining. Johnson, 48, noted that this condition is likely linked to an autoimmune hypothyroidism diagnosis he received at age 21. He expressed gratitude for his intensive "Don't Die" health regimen, suggesting that his focus on wellness over the last five years prevented the condition from becoming much worse. To combat iron deficiency anemia caused by the gastritis, Johnson received a 1,000 mg Monoferric infusion. He also addressed critics of his $2 million-a-year lifestyle, defending his unconventional practices against claims that his diet or environment caused his issues. Johnson maintains that his health management is a proactive attempt to solve long-standing physiological failures and extend human longevity.