Bryan Johnson says his stomach is 'eating itself': What is AIG?

Bryan Johnson recently revealed that he has been diagnosed with autoimmune gastritis (AIG), a condition in which the immune system attacks the stomach's acid-producing cells. He shared that he had been experiencing unexplained low ferritin levels for years, which did not improve despite changes to his diet and supplements. Johnson's diagnosis has brought attention to this condition, which may affect 2-5 per cent of people and often remains hidden. Autoimmune gastritis can lead to vitamin B12 deficiency, iron deficiency, anaemia, and an increased long-term risk of stomach complications. Experts Dr Ruby Taparia and Dr Manjusha Agarwal explained that AIG commonly occurs alongside autoimmune thyroid disorders and develops silently, with symptoms such as fatigue, weakness, bloating, indigestion, numbness, and poor concentration often appearing only after significant damage. While there is currently no cure, early diagnosis through blood tests and endoscopy, along with vitamin B12 and iron replacement, regular monitoring, and management of associated autoimmune conditions, can help prevent complications and improve long-term health. Johnson's experience with AIG has highlighted the importance of early diagnosis and treatment, as well as the need for awareness about this condition. By sharing his story, Johnson hopes to raise awareness about AIG and its potential consequences, and to encourage others to seek medical attention if they are experiencing similar symptoms. The condition can be managed with proper treatment, and Johnson's story serves as a reminder of the importance of prioritizing one's health and seeking medical attention when necessary.