Billionaire Biohacker Bryan Johnson Reveals Autoimmune Gastritis Diagnosis

Overview

• Johnson disclosed on Monday, July 6, 2026, that he has autoimmune gastritis and wrote on social media that "my stomach is devouring itself," calling the condition rare and largely incurable.
• Doctors diagnosed the condition after endoscopy and biopsies that showed early autoimmune damage to the stomach lining, a condition that can cause nutrient loss, anemia and raise long-term cancer risk.
• He links the illness to decades of stress, weight gain and earlier thyroid autoimmunity and says he still takes levothyroxine and Armour Thyroid for a longstanding hypothyroid diagnosis.
• Johnson founded Project Blueprint in 2021 and spends about US$2 million a year on a daily longevity protocol he says has improved biomarkers and reduced his "biological age," though those claims are contested by outside clinicians.
• He has pursued controversial interventions — including multigenerational blood/plasma exchanges and full plasma replacement with albumin — reported to show no clear benefit so far, and experts caution his experiments do not prove longer life or safer care for others.