Billionaire Bryan Johnson Reveals Battle With Incurable Autoimmune Gastritis

Billionaire biohacker Bryan Johnson, 48, has disclosed that he is living with Autoimmune Gastritis, a chronic, incurable condition that causes the stomach lining to essentially “eat itself.” He explained on social media: “My stomach is eating itself.” The disease affects an estimated 2–5 percent of people, though the actual number may be higher due to hidden cases. Johnson linked his diagnosis to past lifestyle choices, including a fast-food diet in his youth and health declines after becoming a father and building his business. He was first diagnosed with hypothyroidism at 21 and managed it successfully until he began experiencing low ferritin levels — an early sign of gastritis. This year, Johnson overhauled his medical team as part of his $1 million-per-year “Immortals Care” longevity program. A series of tests, including a clear colonoscopy result, confirmed his Autoimmune Gastritis. He continues to manage symptoms while seeking a cure.

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