Tech Entrepreneur Bryan Johnson Reveals Autoimmune Stomach Disease Amid Longevity Quest

Bryan Johnson, a 48-year-old American tech entrepreneur known for his extreme longevity experiments, disclosed he has been diagnosed with autoimmune gastritis, a chronic condition where the immune system attacks the stomach lining. Johnson revealed this in a detailed post on social media platform X, explaining that his stomach is "eating itself." The disease, which affects about 2% to 5% of the population but is often undiagnosed, can cause nutritional deficiencies, anemia, and increase the risk of further complications over time.

Johnson, who has spent millions annually on health optimization through strict diet, exercise, frequent blood tests, and experimental treatments, described how the disease developed silently over years. He linked it to an autoimmune process that began in his thyroid gland in his twenties, causing hypothyroidism, and later affected his stomach lining. Despite low iron stores for 11 years, he did not have anemia, and his iron deficiency was initially attributed to diet, intense exercise, and other factors. Only after changing his medical team and conducting thorough gastrointestinal examinations, including colonoscopy and gastroscopy, was the autoimmune gastritis diagnosis confirmed through blood tests and biopsies.

Medical experts from Israeli hospitals explained that autoimmune gastritis involves the immune system attacking stomach cells responsible for acid secretion, leading to reduced stomach acidity essential for food digestion and nutrient absorption, especially iron and vitamin B12. The disease is often associated with other autoimmune conditions, particularly thyroid disorders. Symptoms can be subtle or absent, making diagnosis challenging. Treatment focuses on managing deficiencies and monitoring the condition, as there is no approved cure.

Johnson stated he plans to pursue advanced immune profiling and experimental therapies to "solve" the disease, sharing his journey publicly. He emphasized that absence of symptoms does not guarantee health and urged vigilance in monitoring one's body. Experts recommend that unexplained iron or B12 deficiencies warrant deeper investigation for autoimmune gastritis to prevent complications, including rare risks of stomach cancer. Regular follow-up with biopsies and blood tests is advised for managing this chronic condition.