Longevity influencer Bryan Johnson reveals autoimmune disease, turns to AI for a cure

The revelation

Bryan Johnson, the 48-year-old Silicon Valley millionaire known for his relentless pursuit of biological youth, announced on Instagram that he suffers from a chronic autoimmune disease. "My stomach is eating itself," he said in a video posted to his account. The condition, autoimmune atrophic gastritis, causes the immune system to attack the stomach lining, leading to irreversible damage, nutritional deficiencies and a higher long-term risk of stomach cancer. Johnson believes the roots of the illness lie in his earlier life, when he consumed sugary cereals, soda and fast food, while facing chronic stress and depression while building his first company. "At some point, my body began an autoimmune process that affected first my thyroid and then the lining of my stomach," he explained.

My stomach is eating itself.

A regimen of extreme discipline

Johnson's quest to defeat aging began in 2021 with Project Blueprint, an initiative that later gained global fame through a Netflix documentary. He invests nearly $2 million each year in anti-aging protocols, following a daily routine that includes a strictly measured diet: 130 grams of protein, 206 grams of carbohydrates and 101 grams of fat, totalling 2,250 calories. He takes dozens of supplements, exercises multiple times a day to balance strength, cardio, mobility and flexibility, and goes to bed at 8:30 p.m. in a room cooled to 18 °C, rising at 5 a.m. His teenage son, who participates in a similar regimen, joins him for morning vitamins and meditation.

Diagnosis hidden for years

Despite this obsessive monitoring, the autoimmune gastritis was only diagnosed in May 2026. For more than a decade, Johnson's team had battled persistently low ferritin levels without finding the cause. "For 11 years, I had low iron without anemia. We kept trying to raise iron levels through food and supplements, but nothing worked," he told Stern magazine. The disease, in which the body's own immune cells destroy the stomach's acid-producing parietal cells, can also impair vitamin B12 absorption and raise the risk of precancerous changes and stomach tumors. Experts point out that, while incurable, the condition can be managed with regular gastroscopies and vitamin and iron supplementation, and does not necessarily shorten life expectancy.

How could we have missed that?

A new mission: AI against disease

Rather than retreat into symptom management, Johnson responded with characteristic ambition. "I am happy about my diagnosis," he told Stern, framing it as the start of a new fight: after slowing aging, he now wants to defeat diseases previously considered incurable. He intends to deploy artificial intelligence, multi-omics, DNA analysis and custom-designed proteins and cells to find a cure. "In the era of AI, multiomics and DNA, proteins and tailored cells, no disease should be considered incurable simply because nobody has tried to cure it with today's technologies," he wrote. Together with his girlfriend Kate, Johnson plans to take on two incurable conditions, autoimmune gastritis and endometriosis.

In the era of AI, multiomics and DNA, proteins and tailored cells, no disease should be considered incurable simply because nobody has tried to cure it with today's technologies.

What happens next

Johnson's track record of extreme self-experimentation, including infusions of his son's blood plasma, has made him a polarizing figure in longevity circles. Whether AI can deliver a cure for a complex autoimmune condition remains entirely uncertain. For now, his Project Blueprint has pivoted from aging to confronting illness at its root.