Bryan Johnson's public disclosure of his autoimmune stomach condition has highlighted the significant challenge in diagnosing similar hidden gastrointestinal autoimmune disorders, which are often misattributed to common ailments like acidity or food intolerance due to their gradual onset and overlapping symptoms such as diarrhea, abdominal pain, and weight loss. These conditions, including celiac disease and inflammatory bowel diseases, can lead to severe long-term effects like neurological damage and increased cancer risk if left untreated, with autoimmune gastritis being a prime example where persistent anemia despite iron treatment can be an early, overlooked sign. Timely diagnosis, often requiring endoscopy and biopsies, is crucial, and while current treatments focus on managing symptoms through supplementation and regular surveillance, increased public awareness of specific warning signs like unexplained weight loss or blood in stools is vital for prompt medical attention and better patient outcomes.

Bryan Johnson's public disclosure of his autoimmune stomach condition has highlighted the significant challenge in diagnosing similar hidden gastrointestinal autoimmune disorders, which are often misattributed to common ailments like acidity or food intolerance due to their gradual onset and overlapping symptoms such as diarrhea, abdominal pain, and weight loss. These conditions, including celiac disease and inflammatory bowel diseases, can lead to severe long-term effects like neurological damage and increased cancer risk if left untreated, with autoimmune gastritis being a prime example where persistent anemia despite iron treatment can be an early, overlooked sign. Timely diagnosis, often requiring endoscopy and biopsies, is crucial, and while current treatments focus on managing symptoms through supplementation and regular surveillance, increased public awareness of specific warning signs like unexplained weight loss or blood in stools is vital for prompt medical attention and better patient outcomes.

Bryan Johnson's public disclosure of his autoimmune stomach condition has highlighted the significant challenge in diagnosing similar hidden gastrointestinal autoimmune disorders, which are often misattributed to common ailments like acidity or food intolerance due to their gradual onset and overlapping symptoms such as diarrhea, abdominal pain, and weight loss. These conditions, including celiac disease and inflammatory bowel diseases, can lead to severe long-term effects like neurological damage and increased cancer risk if left untreated, with autoimmune gastritis being a prime example where persistent anemia despite iron treatment can be an early, overlooked sign. Timely diagnosis, often requiring endoscopy and biopsies, is crucial, and while current treatments focus on managing symptoms through supplementation and regular surveillance, increased public awareness of specific warning signs like unexplained weight loss or blood in stools is vital for prompt medical attention and better patient outcomes.

American tech entrepreneur and biohacker Bryan Johnson shared his experience of living with an autoimmune stomach condition, which led to discussions that went beyond his medical condition. His disclosure has put the spotlight on a lesser-known reality: many autoimmune disorders affecting the digestive system can remain hidden for years, often dismissed as routine acidity, food intolerance, or a 'sensitive stomach'.

What are autoimmune diseases? 

Autoimmune diseases arise when the immune system mistakenly attacks the healthy tissues of the body. Even though autoimmune diseases that affect the digestive system are not very common, if they are not detected and treated promptly, they may have major long-term effects.

Common autoimmune diseases of the gastrointestinal tract include celiac disease, in which the immune system reacts to wheat protein (gluten), and inflammatory bowel diseases such as ulcerative colitis. Other autoimmune conditions affecting the digestive system include autoimmune enteropathy, autoimmune hepatitis, primary sclerosing cholangitis, primary biliary cholangitis and Immunoglobulin G4 (IgG4)-related diseases, which can involve the gastrointestinal tract, liver and pancreas.

Why is it difficult to diagnose?

These conditions often present with symptoms such as diarrhoea, abdominal pain, weight loss, blood in the stools and jaundice. However, because these symptoms overlap with more common digestive disorders such as acidity, irritable bowel syndrome (IBS) and food intolerance, autoimmune gastrointestinal diseases are frequently misdiagnosed or diagnosed much later than they should be.

Heartburn, post-meal bloating, nausea, sensitivity to specific foods, and unexplained weight loss are among the symptoms that many patients initially suffer, which makes it simple to confuse these disorders for less serious digestive issues.

Because these conditions develop gradually and mimic common gastrointestinal complaints, diagnosis is frequently delayed until complications arise.

A common illness that is misdiagnosed is autoimmune gastritis, or pernicious anaemia. The condition is slow to advance and has few easily missed symptoms.

Chronic anaemia that persists despite iron treatments is a common early indication of the disease. Other signs of autoimmune gastritis may include nausea after eating, bloating, and some weight loss.

What happens if they are not treated?

If autoimmune gastritis goes untreated, serious medical conditions may occur. Autoimmune gastritis leads to impaired absorption of vitamin B12, which can lead to neurological issues, such as paralysis and chronic anaemia. Over time, the condition also increases the risk of stomach cancer.

An upper gastrointestinal (GI) endoscopy with biopsies, which can show weakening of the stomach lining and loss of acid-producing cells, is usually used to make the diagnosis. Since there is currently no immunotherapy available for autoimmune gastritis, treatment focuses on lifelong management through iron and vitamin B12 supplementation, along with regular endoscopic surveillance using high-resolution imaging to detect early signs of gastric cancer.

The ongoing digestive issues that Johnson experienced demonstrate that people should avoid dismissing their persistent digestive problems. Medical professionals can detect these conditions in their early stages through increased public awareness, which leads to better diagnostic outcomes that prevent permanent damage to patients.

Signs to look out for:

Patients should not ignore persistent anaemia that fails to improve despite oral supplementation, unexplained weight loss of more than five per cent of body weight, recurrent vomiting, blood in the stools or black, tarry stools. These symptoms call for prompt medical attention, as timely diagnosis and treatment enhance the potential for a successful outcome and help forestall possible complications associated with autoimmune disorders of the digestive organs.

(The author is a medical gastroenterology consultant at Manipal Hospital, Old Airport Road, Bengaluru)

The opinions expressed in this article are those of the author and do not purport to reflect the opinions or views of THE WEEK.

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