Biohacker Bryan Johnson reveals diagnosis of autoimmune gastritis causing stomach to eat itself
One-on-one with Bryan Johnson, tech billionaire hoping to reverse ageing
Tech entrepreneur Bryan Johnson wants the world to know that he?s just a regular guy hoping to achieve optimal wellness using a data-driven approach and wants you to hopefully do the same.
Bryan Johnson, a biohacker and longevity guru who is seeking immortality, revealed he has an autoimmune condition causing his stomach to "eat itself."
Johnson shared in a post on X that he was diagnosed with Autoimmune Gastritis (AIG) and intends to "resolve" his condition.
What they're saying:
"Modern medicine has normalized too many conditions that erode our health, function, and comfort, shrinking the goal to monitoring and management while a cure is rarely even attempted. Most of these verdicts were handed down decades ago, in an era that predates nearly all of our current tech and science, and they have gone largely unchallenged. We want to change that. In the age of AI, multiomics, and custom-built DNA, proteins, and cells, no condition should be presumed incurable simply because no one has yet tried to cure it with today's stack," Johnson wrote.
There is currently no cure for AIG.
file - Bryan Johnson at Keynote "Don't Die with Bryan Johnson" during SXSW Conference & Festivals at Austin Convention Center on March 13, 2025 in Austin, Texas. (Photo by Hubert Vestil/SXSW Conference & Festivals via Getty Images)
What is AIG?
Dig deeper:
AIG is a chronic autoimmune disease in which the immune system attacks the stomach's acid-producing parietal cells, reducing stomach acid and impairing vitamin B12 absorption, according to the Global Autoimmune Institute.
AIG can remain hidden and can be challenging to diagnose, Johnson noted, often surfacing years after damage has already occurred to the stomach. It can cause iron deficiency, B12 deficiency and anemia, and can also increase the risk of stomach cancer, the expert warned.
"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."
Who is Bryan Johnson?
The backstory:
Johnson is a Los Angeles-based tech entrepreneur, 48, who has previously shared publicly that he is hoping to live until the year 2140, when he would in theory be 160 years old.
He detailed his strategy for defying aging, which includes embracing a strict regimen to slow or stop biological aging, using AI to accelerate longevity research, testing new treatments in lab-grown cells and organs, and reaching "longevity escape velocity" — in which medical advances would eventually extend lifespan faster than he ages.
The Source: Information for this article was taken from a post on X published by Bryan Johnson on June 30, 2026. FOX News and previous reporting by FOX Local also contributed.