Bryan Johnson is widely known for his extensive efforts to maintain optimal health and slow the aging process.
Despite this, he experienced persistently low iron stores for an extended period, even though he was taking iron supplements.
According to Johnson, this led to a series of medical investigations.
Doctors first ruled out colorectal cancer through a colonoscopy.
Also read: New study finds men and women perceive sleep differently
They then collected tissue samples from his stomach, which ultimately provided the answers they were looking for.
Condition can be difficult to detect
Johnson said he had previously been diagnosed with hypothyroidism, which is being managed with medication.
He believes the newly diagnosed condition may have been developing for many years without causing any obvious symptoms.
According to the Global Autoimmune Institute, as cited by LADBible, the disease is often difficult to detect because it progresses slowly.
Also read: Experiment reveals how the body reacts after a week without food
The organization also states that there is currently no treatment capable of curing the condition.
Instead, treatment focuses on managing symptoms and addressing complications such as anemia.
The final diagnosis
Only after the analysis of the stomach tissue samples was Bryan Johnson diagnosed with Autoimmune Gastritis.
The disease causes the body's immune system to attack the lining of the stomach, which can lead to nutrient deficiencies, anemia, and, over time, an increased risk of cancer.
Also read: Numb hands and feet: What your body is telling you
Johnson has also said that he will continue working with his team to explore whether new treatments or approaches for the disease can be developed.
Also read: Why swimming is one of the best exercises for your heart