What everyone got wrong about biohacker Bryan Johnson’s viral diagnosis: A medical expert weighs in

Last week, biohacker Bryan Johnson shook the internet with a viral announcement: He’d been diagnosed with autoimmune gastritis, or AIG. “My stomach is eating itself,” Johnson wrote at the start of a lengthy social media post. The condition, he explained, is linked to his hyperthyroidism, which he was diagnosed with in his 20s. But because the disease often presents without clear symptoms, his AIG remained hidden for another two decades until he was finally diagnosed this May at age 48.Johnson and his doctors eventually discovered his AIG because of his low ferritin (iron storage) levels, ev...