Bryan Johnson, the former tech CEO who's gained famed for his biohacking pursuits, says he has autoimmune gastritis. Here's what to know.

Bryan Johnson, renowned biohacker, disclosed his diagnosis of autoimmune gastritis after undergoing extensive medical tests, including biopsies and blood work.

ALBAWABA - Famous 'Anti-ageing biohacker' and influencer Bryan Johnson recently made headlines after revealing that he has an autoimmune disease called