Bryan Johnson's Battle with Autoimmune Gastritis: A New Challenge in His Longevity Journey

Bryan Johnson's Health Journey

Many in India recognize Bryan Johnson as the individual who brought his own air purifier to a podcast with Nikhil Kamath, leaving midway due to the poor air quality in Mumbai that overwhelmed even his device. This incident occurred in a seaside room in Bandra, where Johnson wore a mask for most of the recording before deciding he could no longer continue. This moment encapsulates his commitment to a singular goal: to extend human life through scientific means.

As a wealthy entrepreneur and biohacker, Johnson invests approximately $2 million annually into an extensive longevity regimen known as Project Blueprint. His routine includes a strictly controlled plant-based diet, a disciplined exercise plan, early bedtimes, numerous medical evaluations, and a plethora of supplements. He meticulously tracks and shares nearly every health metric, which is why his recent announcement has caught even his most ardent followers off guard.

Recently, Johnson disclosed on social media that he has been diagnosed with autoimmune gastritis (AIG), a rare autoimmune disorder where the immune system gradually attacks the stomach lining. Currently, there is no cure for this condition, and it can only be managed rather than reversed. Although AIG is relatively uncommon, studies indicate it may impact around 2 to 5 percent of the global population, with many cases going undiagnosed due to vague symptoms that are easily overlooked.

For someone who has become a symbol of reversing biological age and has openly discussed his quest to avoid death, this diagnosis is unexpected. Johnson has a history of engaging in ambitious and sometimes controversial health experiments. One notable trial involved receiving plasma from his teenage son as part of an anti-aging study, which later garnered global attention before Johnson admitted it yielded no measurable benefits and he quietly abandoned the concept.

However, Johnson's health journey predates Project Blueprint. He has openly shared his past of consuming fast food, sugary beverages, and processed items. He describes his twenties as a brief period of health before his lifestyle declined while he was raising a family and building his businesses. During this time, he also faced severe chronic depression.

Reflecting on his health timeline, Johnson noted that his body began developing an autoimmune issue affecting his thyroid and stomach lining. He was diagnosed with hypothyroidism at the young age of 21 and managed it effectively with standard treatments for nearly thirty years. In retrospect, he believes his body had been signaling that something was amiss all along. It wasn't until May 2026 that doctors confirmed his autoimmune gastritis diagnosis. "I am unsure how long I have had it," Johnson shared. "AIG leads to irreversible damage: nutritional deficiencies, anemia, and, over time, an increased risk of cancer."

Looking back, he recalls a significant clue that he overlooked. For over 11 years, Johnson consistently had low ferritin levels, the protein responsible for iron storage in the body, despite never developing anemia. He spent years trying various methods to boost his iron levels, but nothing seemed effective. It was only after the AIG diagnosis that the pieces began to align.

Iron deficiency is often one of the earliest indicators of autoimmune gastritis. The challenge lies in the fact that its symptoms—such as abdominal pain, nausea, loss of appetite, unexplained weight loss, and low iron—are common to many digestive disorders, making early identification of the disease notoriously difficult. Ironically, the diagnosis emerged while Johnson was striving to enhance his health.

As part of preparations for a new annual $1 million longevity initiative called Immortals Care, he underwent extensive testing. A colonoscopy ruled out cancer, but a bidirectional endoscopy, which examines both the upper and lower digestive tracts, along with blood tests, revealed elevated anti-parietal cell antibodies, indicating autoimmune gastritis. A stomach biopsy subsequently confirmed early damage to the stomach lining. Johnson and his team are now treating this diagnosis as another scientific challenge.

Currently, they are closely monitoring his iron levels and other biomarkers while conducting further tests to gain a deeper understanding of the disease. In addition to conventional management, they are exploring experimental methods, including therapies targeting immune signaling proteins, rebuilding regulatory T-cells, and engineered cell therapies.

Whether any of these approaches will prove effective remains uncertain. There is still no cure for autoimmune gastritis. However, Johnson is optimistic that medicine is entering a new era where diseases once deemed incurable can be challenged through artificial intelligence, multiomics, and advanced genetic and cellular engineering. "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 attempted to cure it with today's resources," he stated.

Whether Johnson will succeed in this endeavor is a question that only time can answer, but for someone who has built a philosophy around extending human longevity, being diagnosed with autoimmune gastritis at 48 years old has become his latest and perhaps most personal experiment.