Famous biohacker chasing immortality blindsided by diagnosis: ‘My stomach is eating itself’

For years, tech entrepreneur Bryan Johnson has become the face of the modern longevity movement, spending millions of dollars on cutting-edge testing, experimental health protocols and meticulous data tracking in an effort to dramatically extend his lifespan.

Now, the man who famously declared that humanity may be the first generation to escape aging says he has discovered a serious health problem that quietly developed despite all of that monitoring.

Johnson announced this week that he has been diagnosed with autoimmune gastritis (AIG), a chronic condition in which the body’s immune system attacks the stomach’s acid-producing cells. In a social media post, he described the disease bluntly:

“My stomach is eating itself.”

According to Johnson, the disorder likely remained hidden for years while slowly damaging his stomach lining and interfering with his body’s ability to absorb nutrients, particularly iron and vitamin B12.

“Low iron stores get normalized and rarely investigated at all when anemia hasn’t shown up yet,” Johnson wrote. “That blind spot is what hid mine for a decade.”

Johnson said he had battled unusually low ferritin levels for roughly 11 years. Despite careful nutrition, supplements and repeated attempts to restore his iron, nothing worked.

“We continually tried to raise my iron levels with food and supplementation, but nothing would work.”

Searching for answers, Johnson underwent an extensive medical evaluation that included an upper endoscopy, colonoscopy and multiple stomach biopsies. The testing revealed early autoimmune gastritis, a disease that medical researchers say can remain undiagnosed for years before symptoms become obvious.

Medical literature describes autoimmune gastritis as an uncommon but increasingly recognized condition that reduces stomach acid production, impairs vitamin B12 absorption and can increase the risk of pernicious anemia and certain forms of stomach cancer if left untreated. Because early symptoms are often vague—or absent altogether—patients may first discover the illness only after unexplained iron deficiency or persistent fatigue.

Johnson believes his intense exercise regimen and recovery routines—including endurance training, sauna sessions and hyperbaric oxygen therapy—increased his body’s demand for iron but were not the root cause of the deficiency.

“None of them explained the core failure… none of the iron would stick.”

The diagnosis marks a surprising twist for a man who has built a global following around his highly publicized anti-aging protocol. Johnson has repeatedly said he hopes advances in artificial intelligence, regenerative medicine and biotechnology will eventually allow humans to dramatically extend healthy lifespans. Earlier this year, he wrote that his long-term goal is to reach “longevity escape velocity,” where medical breakthroughs arrive faster than the body ages.

Despite the setback, Johnson says he isn’t abandoning that mission.

“I’m going to try to solve it. Will share all.”

Medical experts caution that while autoimmune gastritis can often be managed, there is currently no cure. Treatment generally focuses on monitoring vitamin deficiencies, replacing nutrients when necessary and screening for complications over time.

You have to give Bryan Johnson credit for one thing: when something goes wrong, he tells the world.

Here’s the irony. A man spending millions to outwit Father Time was humbled by a disease quietly developing under the radar for years. That’s a reminder that medicine—even with AI, billion-dollar technology and an army of specialists—is still medicine, not magic.

There’s also a lesson here for everyday Americans who don’t have billionaire budgets. If something in your blood work keeps looking “a little off” year after year, don’t settle for, “It’s probably nothing.” Johnson’s low iron wasn’t nothing.

The longevity crowd sometimes talks as if death is just another software bug waiting for a patch. Reality has a way of crashing that presentation.

Take care of yourself. Eat well. Exercise. Get your checkups. But maybe don’t bet the farm on living to 160 just yet. The Almighty still has a pretty good track record.