Tech entrepreneur and longevity advocate Bryan Johnson has revealed that he has been diagnosed with Autoimmune Gastritis (AIG), describing the condition by saying, "My stomach is eating itself."
Johnson shared the diagnosis on social media, saying the disease had likely gone undetected for years despite his intensive health monitoring.
In a recent social media post, the 48-year-old said he is living with Autoimmune Gastritis, a chronic condition in which the immune system attacks healthy cells in the stomach lining.
Johnson wrote that the illness had remained "silent" for years before doctors finally identified it.
What is autoimmune gastritis?
Autoimmune Gastritis occurs when the body's immune system mistakenly attacks the stomach's parietal cells, which produce stomach acid and a protein needed to absorb vitamin B12.
Over time, the condition can lead to vitamin deficiencies, chronic anaemia and an increased risk of stomach cancer if left untreated.
Johnson said he had struggled with persistently low iron levels for more than a decade despite closely tracking his health.
The diagnosis was confirmed in May after doctors performed a bidirectional endoscopy and multiple stomach biopsies, which revealed early-stage stomach atrophy.
Seeking new treatment approaches
While Autoimmune Gastritis is generally considered a condition that can be managed rather than cured, Johnson said he plans to work with researchers to explore new treatment options.
He added that he intends to share his findings publicly throughout the process.
Johnson said his experience demonstrates that serious health conditions can develop without obvious symptoms.
He encouraged people to undergo regular medical screenings, saying that feeling healthy does not always mean underlying illnesses are absent.
