Bryan Johnson has revealed that he has been diagnosed with autoimmune gastritis, a chronic condition in which the body’s immune system mistakenly attacks the stomach lining. Sharing the update on social media, Johnson described the illness by saying, “My stomach is eating itself,” drawing widespread attention to a disease that is often difficult to detect in its early stages.
Known for investing heavily in longevity research and personal health, Johnson said the diagnosis came despite his strict lifestyle and extensive medical monitoring. He explained that the condition cannot be cured but can be managed with regular medical care, dietary changes and treatment to prevent complications.
Autoimmune gastritis develops when the immune system damages the cells responsible for producing stomach acid and a protein called intrinsic factor, which is essential for absorbing vitamin B12. Over time, this can lead to vitamin B12 deficiency, anaemia and digestive problems such as nausea, stomach discomfort, bloating and fatigue. Some people may not experience noticeable symptoms until the disease has progressed.
Doctors say the condition is relatively uncommon and is more frequently seen in people with other autoimmune disorders, including thyroid disease and type 1 diabetes. While there is no permanent cure, early diagnosis can help manage symptoms and reduce the risk of long-term complications through medication, nutritional supplements and regular health monitoring.
Johnson said the diagnosis was unexpected, especially given his focus on preventive healthcare. His openness has sparked conversations about the importance of paying attention to persistent digestive symptoms and seeking medical advice when problems continue.
Health experts note that autoimmune gastritis often goes undiagnosed because its symptoms can resemble common digestive issues. Blood tests, vitamin B12 assessments and endoscopy are among the investigations used to confirm the condition.
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