Johnson, who is widely known for spending more than $1 million annually on his longevity programme, disclosed the diagnosis in a post on social media, saying the condition was confirmed following a series of medical tests.
"My stomach is eating itself," the 48-year-old wrote.
According to Johnson, he discovered the condition in May after undergoing extensive investigations to determine the cause of persistently low ferritin levels, a protein that stores iron in the body.
"I'm unsure how long I've had it," he added.
Johnson explained that he had experienced unusually low ferritin levels for more than a decade without developing anaemia. Further medical tests revealed elevated anti-parietal cell antibodies, while a stomach biopsy confirmed the early stages of autoimmune gastritis.
He also disclosed that he was diagnosed with hypothyroidism at the age of 21 and has managed the condition for nearly three decades. Autoimmune gastritis is more common in people living with other autoimmune disorders, including thyroid disease.
The entrepreneur believes the condition may have been developing unnoticed for years because its symptoms, such as abdominal pain, nausea, loss of appetite, iron deficiency and unexplained weight loss, can easily be mistaken for other illnesses.
Despite the diagnosis, Johnson said he intends to explore treatment options beyond conventional medical approaches.
"When AIG is discovered today, standard medical care concedes defeat, stating that nothing can be done except managing the condition, no matter how awful or lethal the effects," he said.
Johnson revealed that his medical team will continue to monitor his iron levels and other biological markers while investigating potential new approaches to managing the disease.
"There’s no approved cure for autoimmune gastritis today," he noted.
He also expressed optimism that advances in artificial intelligence, genomics and biotechnology could eventually lead to more effective treatments.
"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," he said.
The Silicon Valley entrepreneur gained international attention through his ambitious anti-ageing programme, which combines a strict diet, intensive exercise, frequent medical testing and experimental health interventions aimed at slowing the ageing process. He also featured in the Netflix documentary Don't Die: The Man Who Wants to Live Forever, which chronicled his quest to extend human lifespan.
Reaffirming his long-term ambition in a separate social media post, Johnson wrote: "I don't intend to live a little. I intend to live more than any human who has yet lived and invite you to join."
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