American Biohacker Brian Johnson Reveals Autoimmune Gastritis Diagnosis After Years of Symptoms
Brian Johnson, an American entrepreneur and biohacker known for his rigorous health monitoring and multi-million dollar investment in anti-aging research, recently disclosed a diagnosis of autoimmune gastritis. Despite his meticulous lifestyle and extensive medical testing, Johnson only learned in May that he has this chronic condition, which causes the immune system to attack stomach cells responsible for acid production and intrinsic factor, essential for vitamin B12 absorption.
Johnson revealed on social media that his stomach was "eating itself," a dramatic description of the disease's slow progression, often without symptoms. He noted that for over 11 years he suffered from unusually low iron stores despite a careful diet and supplements, with no anemia detected, which delayed suspicion. Only after persistent iron depletion did doctors conduct comprehensive tests including colonoscopy, gastroscopy, blood tests, and stomach biopsies, confirming the diagnosis.
Autoimmune gastritis leads to reduced stomach acidity and impaired absorption of iron, vitamin B12, and other nutrients, potentially causing anemia, neurological issues, cognitive decline, chronic fatigue, and increased risk of stomach cancer if untreated. Johnson also has a history of autoimmune thyroid disease diagnosed at age 21, highlighting the common co-occurrence of autoimmune disorders.
Currently, there is no cure for autoimmune gastritis. Treatment focuses on early detection of nutritional deficiencies, iron infusions, vitamin B12 injections, regular endoscopic monitoring, and cancer risk management. Johnson has begun iron infusions and plans ongoing monitoring of his iron and vitamin B12 levels, biological markers, and repeat biopsies.
His case underscores the difficulty of diagnosing autoimmune diseases early, even with advanced health tracking. Medical experts stress the importance of thorough evaluation for unexplained iron deficiency, anemia, or vitamin B12 deficiency, especially in patients with other autoimmune conditions, to prevent complications and enable effective management.
