My Stomach Is Eating Itself: Biohacker Bryan Johnson Diagnosed With Incurable Autoimmune Gastritis

Bryan Johnson , the Silicon Valley entrepreneur who sold Braintree to PayPal for 800 million dollars and later turned himself into arguably the most measured human on the planet, has revealed a diagnosis that no amount of optimisation could prevent. In a series of posts on X, Johnson disclosed he has been diagnosed with autoimmune gastritis , writing simply, my stomach is eating itself.

Autoimmune gastritis , often shortened to AIG, is a chronic condition in which the immune system mistakenly attacks the cells lining the stomach responsible for producing acid and absorbing nutrients such as vitamin B12 and iron. The disease affects an estimated two to five percent of the population, frequently developing silently for years before detection. It has no cure, though experts say it can be managed through supplementation and monitoring, and carries a long term increased risk of stomach cancer.

Johnson's road to diagnosis stretched back more than a decade. Despite obsessive health tracking, he experienced persistently low ferritin , the protein that stores iron, even as his hemoglobin and hematocrit stayed normal, allowing doctors to repeatedly dismiss the issue. Johnson explained that because the body drains iron reserves first before hemoglobin drops, a person can be significantly iron deficient while blood tests still appear perfectly fine. Supplements failed to move the needle, eventually prompting stomach biopsies and specialised antibody testing that confirmed the diagnosis. He has since begun iron infusions , B12 treatment and long term monitoring, while pledging to apply artificial intelligence and cutting edge medicine toward managing the disease.

The revelation lands as a strange irony for a man whose entire public identity rests on his Blueprint project , a regimen that tracks hundreds of biomarkers, MRIs, organ scans and blood tests, enforces strict sleep schedules, times his last meal for eleven in the morning and has included receiving plasma transfusions from his own teenage son. Johnson has effectively become the logical endpoint of Silicon Valley thinking, the belief that with enough data, every biological problem can eventually be solved.

To his credit, Johnson has remained transparent throughout, publishing his protocols, lab results and the underlying scientific literature for followers to evaluate themselves. His experiments have generated genuinely useful public data on sleep, nutrition and preventative health, and even critics concede he has pushed longevity science into mainstream conversation. His biomarkers reportedly still resemble those of someone decades younger.

Yet as immunologists point out, autoimmune disease rarely announces itself on a spreadsheet. Scientists still do not fully understand what triggers conditions like AIG, though genetic predisposition and infections are both suspected factors. For a man who has spent millions chasing the singular goal of not dying, the diagnosis is a reminder that the human body, unlike most software, does not always alert you before something breaks.