Bryan Johnson's 'Stomach Is Eating Itself': Biohacker Vows to Cure Incurable Autoimmune Disease after Silent Decade-Long Battle

Bryan Johnson, the 48-year-old biohacker who spends $2 million a year trying to reverse aging, has revealed he was diagnosed with autoimmune gastritis in May. After a decade of unexplained low iron levels, Johnson says "standard medical care concedes defeat" but he's vowing to solve it with experimental therapies.

Bryan Johnson has spent years optimizing every measurable aspect of his biology. Now, his body has thrown him a curveball that even his "Blueprint" protocol couldn't prevent.

The tech entrepreneur, who sold Braintree to PayPal for $800 million in 2013, revealed in July that he has been diagnosed with autoimmune gastritis (AIG). "My stomach is eating itself," he wrote on X. The condition affects an estimated 2 to 5 per cent of the population but often goes undetected because early symptoms are vague or non-existent.

A Decade of Hidden Signals

Johnson's path to diagnosis began more than a dkecade ago. Despite years of regular health monitoring, he experienced persistently low ferritin a protein that stores iron in the body without anemia. His hemoglobin and hematocrit remained normal, which allowed the issue to be dismissed by doctors. "Ferritin measures stored iron, while hemoglobin measures circulating iron, and because the body drains its reserves first to keep hemoglobin normal, you can be fully iron deficient with a perfectly normal hemoglobin and hematocrit," Johnson explained.

A clean colonoscopy ruled out colon cancer, but his medical team ordered a bi-directional endoscopy along with blood biomarker testing. The results showed elevated anti-parietal cell antibodies at 103 Units/mL against a ceiling of 20 Units/mL roughly five times the upper limit of normal. Stomach biopsies confirmed early-stage AIG with "early atrophy confined to the acid-producing lining."

Johnson described the condition as "never one problem" but three linked issues: iron deficiency, autoimmune gastritis driving it, and autoimmune thyroid disease alongside it. He had been diagnosed with hypothyroidism at age 21 and managed it with levothyroxine and Armour Thyroid. Each made the other harder to fix, creating what he called a "bidirectional" loop.

What Autoimmune Gastritis Actually Does

Autoimmune gastritis occurs when the immune system mistakenly attacks the stomach's acid-producing parietal cells. Over time, this damages the stomach lining, reduces stomach acid production, and impairs nutrient absorption particularly vitamin B12 and iron. It can lead to anemia, pernicious anemia, and over a long horizon, increased cancer risk.

Many people with AIG don't show symptoms early on. When symptoms appear, they can include fatigue, iron deficiency, vitamin B12 deficiency, nausea, bloating, and loss of appetite. Johnson noted that in one study of people with precancerous gastric lesions, roughly 18% carried the autoimmune antibodies, yet only about 1% had ever been diagnosed.

The Blueprint Protocol: A Life Measured in Thousands of Biomarkers

Johnson's daily protocol is documented at protocol.bryanjohnson.com and covers six major areas: blood work and biomarker testing, prescription medications, supplements, advanced therapies, lifestyle, and continuous monitoring.

His daily routine includes approximately 2,250 calories (10% caloric restriction) consumed within a 6-hour window, with 130g of plant-heavy protein. He exercises 6 hours per week, including 150 minutes of zone 2 cardio, 75 minutes of HIIT, strength training 3 times weekly, and daily flexibility work. He aims to be in bed by 8:30 pm and awake by 4:30 am, with no screens 60 minutes before bed.

He takes around 100 supplements daily including creatine, collagen peptides, omega-3s, ashwagandha, CoQ10, vitamin D, and NAD precursors. He also takes seven daily prescription medications and one biweekly injection including Rapamycin (which he later discontinued due to side effects), acarbose, and Repatha.

Johnson monitors an extensive list of biomarkers through comprehensive blood draws every 3-6 months and epigenetic DNA methylation testing twice yearly. His full-body MRI and continuous glucose monitor provide real-time insight into his health.

Experimental Path Forward

Johnson has outlined a four-tier experimental approach to address his AIG, acknowledging there is "no approved cure" today. He is currently receiving B12 injections and iron infusions his iron deficiency has been corrected with a 1,000 mg Monoferric iron infusion. His team will perform repeat biopsies and develop experimental intervention treatments depending on the results.

His plan includes targeting signalling pathways (JAK/STAT, GSK-3, and IL-17), cellular reset approaches using induced regulatory T cells, and eventually, AI-designed antibodies capable of specifically destroying rogue immune cells attacking the stomach lining.

"When AIG is discovered today, standard medical care concedes defeat, stating that nothing can be done except managing the condition, no matter how awful or lethal the effects," Johnson wrote. "In the age of AI, multiomics, and custom-built DNA, proteins, and cells, no condition should be presumed incurable simply because no one has yet tried to cure it with today's stack."

Here is the question this diagnosis raises. A man who has spent millions optimizing every measurable biomarker, worn blue-light-blocking glasses for two hours before bed every night, and tracked his overnight erections on a machine was still blindsided by a decade-long autoimmune process. When even the world's most quantified human can miss a disease that affects 2 to 5 per cent of the population, is the problem his protocol or the fundamental limits of self-tracking?

As Bryan Johnson vows to solve an incurable disease his body spent years hiding, The Silicon Review asks a final question. When a biohacker who measures everything fails to detect his own immune system attacking his stomach for a decade, what does that say about the gap between what we can measure and what we actually need to know?

FAQ:

Q: What is autoimmune gastritis (AIG)?
A: Autoimmune gastritis is a chronic inflammatory disease where the immune system mistakenly attacks the stomach's acid-producing parietal cells. Over time, this damages the stomach lining, reduces stomach acid, and impairs absorption of iron and vitamin B12, increasing the risk of anemia and gastric cancer.

Q: What did Bryan Johnson say about autoimmune gastritis?
A: Johnson revealed on July 1, 2026, that he has been diagnosed with AIG, saying: "My stomach is eating itself." He described it as an incurable condition that causes irreversible damage including nutritional deficiency, anemia, and elevated cancer risk.

Q: How did Bryan Johnson discover he had autoimmune gastritis?
A: After a decade of unexplained low ferritin (stored iron) levels despite normal hemoglobin, Johnson's medical team performed a colonoscopy (clean), a bi-directional endoscopy, and blood tests showing elevated anti-parietal cell antibodies. Stomach biopsies confirmed early-stage AIG.

Q: Is autoimmune gastritis curable?
A: There is currently no cure for AIG. Treatment focuses on managing nutrient deficiencies through B12 injections and iron infusions. Johnson is exploring experimental therapies including immune cell reset and AI-designed antibodies.

Q: What is Bryan Johnson's daily health protocol?
A: Johnson's "Blueprint" protocol includes a 2,250-calorie plant-heavy diet, 6 hours of weekly exercise, 8:30 pm bedtime, over 100 daily supplements, 7 daily prescription medications, comprehensive blood tests every 3-6 months, and continuous monitoring of biomarkers including inflammation, blood pressure, and cholesterol.

Q: Is Bryan Johnson still taking Rapamycin?
A: No. Johnson discontinued Rapamycin in September 2024 after experiencing intermittent skin infections, high glucose levels, blood lipid abnormalities, and a heightened resting heart rate, concluding the benefits didn't outweigh the drawbacks.