Biohacker Bryan Johnson Reveals Autoimmune Gastritis Diagnosis: ‘My Stomach Is Eating Itself’ | Today’s news

Bryan Johnson, the tech entrepreneur and anti-aging advocate known for spending millions of dollars annually on health optimization and anti-aging interventions, has revealed that he has been diagnosed with autoimmune gastritis (AIG), a chronic autoimmune disorder in which the body’s immune system attacks the lining of the stomach.

In a long post, biohacker Bryan Johnson reveals the diagnosis of autoimmune gastritis

In a lengthy post shared on X, Johnson described his diagnosis as both a personal and a scientific challenge, and said he plans to publicly document his attempts to better understand and potentially treat the condition.

“Bad news #1: I have an autoimmune disease. My stomach is eating itself (sic),” Johnson wrote.

He added: “Bad news #2: 2-5% of people have it too. Probably more because it hides (sic).”

Johnson, 48, who has gained international attention for his Blueprint Longevity Project and extensive experiments with health monitoring and age-reversal therapies, said he was diagnosed with autoimmune gastritis in May after years of unexplained low iron stores and a history of autoimmune thyroid disease.

“Good news: I’ll try to sort it out. Sharing all (sic),” he wrote.

According to Johnson, his medical history dates back to a diagnosis of hypothyroidism at the age of 21, for which he received long-term hormone replacement therapy. But he said that for more than a decade, doctors were unable to determine why he had persistently low ferritin levels despite dietary interventions and supplementation.

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“My hypothyroidism was diagnosed when I was 21 with a routine blood draw (sic),” Johnson wrote. “What I didn’t know was that something else was happening in my body: my stomach started attacking itself (sic).”

Johnson said his medical team reviewed years of clinical data after overhauling his healthcare program earlier this year as part of what he described as the basis for his “Immortals Care” protocol, which he said costs about $1 million a year.

Investigations included colonoscopy, upper endoscopy, blood biomarker analysis and multiple gastric biopsies. According to Johnson, tests revealed elevated antibodies against parietal cells, while biopsies confirmed early-stage autoimmune gastritis.

“Now we have had a formal diagnosis. I have autoimmune gastritis AIG. My stomach is eating itself (sic),” he wrote.

Autoimmune gastritis is a relatively uncommon but often underdiagnosed condition in which the immune system attacks cells in the stomach that produce acid and intrinsic factor, a protein necessary for the absorption of vitamin B12. Medical experts say the disease can remain asymptomatic for years before causing iron deficiency, vitamin B12 deficiency, anemia and, in some cases, an increased risk of stomach cancer and neuroendocrine tumors.

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Johnson argued that the condition often goes undiagnosed because standard medical assessments tend to focus on anemia.

“And the earliest clue, low ferritin, is what standard medicine waves at,” he wrote. “Low iron stores are normalized and rarely even screened for when anemia is not present. That blind spot is what hid mine for a decade (sic).”

Bryan Johnson shares his tips for a long life.(Instagram)

He said his iron deficiency has since been corrected with a 1,000 mg intravenous iron infusion and that he plans to conduct extensive monitoring and experimental research approaches to better understand the underlying mechanisms of the disease.

Johnson outlined a multi-tiered strategy involving routine biomarker monitoring, repeat biopsies, immune profiling and exploratory therapeutic approaches, including interventions targeting immune pathways, regulatory T cells and potentially engineered cell therapies. However, he admitted that many approaches remain experimental.

“To be clear: there is no approved cure for autoimmune gastritis today. Medicine treats it as something to be managed, not solved (sic),” he wrote.

The businessman also used his diagnosis to advocate for proactive health monitoring and preventive medicine, arguing that the absence of symptoms does not necessarily mean good health.

“You too may have a lurking health problem that is undiagnosed and could be exacerbated by unhealthy life choices without you knowing (sic),” he wrote. “The absence of symptoms is not the presence of health (sic).”

Johnson concluded his post with a broader reflection on health, mortality, and human priorities, urging people to prioritize their well-being.

“We fill our days mostly with things that are trivial next to what ultimately matters to us,” he wrote. “Deep down, however, we know that in the noise of it all, health is easily forgotten until it’s the only thing that matters (sic).”

Johnson said he intends to continue sharing updates on his condition and any future research aimed at understanding or potentially treating autoimmune gastritis.