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What is autoimmune gastritis? The rare disease anti-ageing millionaire Bryan Johnson says is ‘eating’ his stomach

Published जुलाई 7, 2026 · Updated जुलाई 7, 2026 · By Jessica Taylor

Autoimmune Gastritis: The Rare Disease Bryan Johnson Says Is Eating His Stomach

What is autoimmune gastritis The rare - Bryan Johnson, a 48-year-old tech entrepreneur and self-proclaimed anti-aging expert, has brought autoimmune gastritis into the spotlight after revealing his diagnosis. The rare condition, which the immune system mistakenly attacks the stomach lining, is now central to his personal health journey. Johnson humorously described the condition as “my stomach is eating itself,” a metaphor that underscores the severity of the disease. Despite ongoing research, there is no definitive cure, but he is actively exploring treatments to manage the condition and its impact on his body.

What is Autoimmune Gastritis?

Autoimmune gastritis is a chronic inflammatory condition where the immune system misidentifies parietal cells in the stomach as foreign and launches an attack. This leads to the destruction of these cells, which are essential for producing stomach acid and intrinsic factor—a protein critical for vitamin B12 absorption. As the condition progresses, the stomach lining thins, impairing the body’s ability to absorb key nutrients such as iron, calcium, and vitamin B12. This can result in various complications, including anemia, neurological issues, and an increased risk of stomach cancer.

Research indicates that autoimmune gastritis is often linked to other autoimmune disorders, such as hypothyroidism and type 1 diabetes. In fact, Johnson’s diagnosis followed years of managing hypothyroidism, which he had treated with hormone therapy since his early twenties. However, he eventually noticed patterns in his symptoms that pointed to a more complex condition. The term “autoimmune gastritis” is frequently used in medical literature to describe this process, but its prevalence remains relatively low compared to other gastrointestinal diseases.

Bryan Johnson’s Journey with Autoimmune Gastritis

Johnson’s battle with autoimmune gastritis began as a series of unexplained health issues. He initially attributed his fatigue, weight gain, and digestive discomfort to lifestyle factors like fast food and stress. However, after years of fluctuating ferritin levels—a marker of iron stores—his medical team identified a more serious underlying cause. The discovery came in May when a combination of blood tests and biopsies confirmed the presence of autoimmune gastritis.

His diagnosis has prompted a shift in his approach to health and longevity. While he continues to invest heavily in anti-aging research, he now focuses on managing the disease through targeted interventions. This includes monitoring his nutritional intake, experimenting with immune-modulating therapies, and using advanced diagnostic tools to track the disease’s progression. The rare nature of autoimmune gastritis means that his experience is not only personal but also potentially informative for others facing similar challenges.

Treatment and Management Strategies

Currently, the primary treatment for autoimmune gastritis involves addressing nutritional deficiencies caused by the disease. Johnson has undergone intravenous iron therapy to combat his low iron levels, a common symptom in early-stage cases. However, this approach only manages the effects of the condition, not the root cause. Scientists are working on developing therapies that can halt the immune system’s attack on the stomach lining, including AI-engineered antibodies designed to target specific parietal cells.

While these experimental treatments are not yet standard care, they represent a promising direction in managing autoimmune gastritis. Johnson’s proactive stance highlights the importance of early detection and personalized medicine in tackling rare diseases. He has also adopted a stricter diet and routine to support his body’s recovery, emphasizing the role of lifestyle changes in complementing medical treatment.

Why Autoimmune Gastritis Matters

Autoimmune gastritis is a prime example of how the immune system can malfunction, leading to significant health consequences. Its rarity means many people may not recognize the symptoms, which can include chronic indigestion, bloating, and unintended weight loss. Johnson’s experience serves as a reminder that even high-profile individuals can face uncommon conditions, and that understanding the body’s complexities is crucial for effective treatment.

Researchers warn that autoimmune gastritis often goes undiagnosed for years due to its subtle symptoms. This delayed detection can lead to severe complications, such as pernicious anemia and an increased risk of gastric cancer. By raising awareness, Johnson hopes to inspire others to seek early diagnosis and treatment, potentially improving outcomes for those affected by the rare disease.

“My stomach is eating itself.” – Bryan Johnson

Author's Note and Background

This article provides general information about autoimmune gastritis and Bryan Johnson’s experience with the condition. It should not replace professional medical advice. Always consult a healthcare provider for an accurate diagnosis and personalized treatment plan.

The content is based on Johnson’s social media posts and public statements. While the article