Longevity tech faces reality check as biohacker Johnson falls ill

Tech entrepreneur Bryan Johnson has revealed he was diagnosed with autoimmune gastritis in May, a condition where "my stomach is eating itself." The 48-year-old American, who hopes to live until 2140, discovered the disease after months of medical tests to investigate an iron deficiency.

Johnson is the public face of the extreme biohacking movement, spending around US$2 million annually on a rigorous anti-ageing regimen. His routine involves a team of more than 30 doctors, plasma exchanges with his son, and experimental gene therapies.

For investors and companies in Europe’s growing longevity and biotech sectors, the diagnosis serves as a stark reminder of the biological limits of current technology. The biohacking market is built on the premise that intensive capital deployment can successfully halt or reverse cellular ageing. Johnson’s development of a chronic condition while under the care of an elite medical team suggests that even vast financial resources cannot yet outpace complex internal biological failures.

Autoimmune gastritis affects between 0.5 and 4.5 per cent of adults globally, according to the Global Autoimmune Institute. It attacks the stomach lining, causing severe nutrient deficiencies and increasing the risk of gastric cancer if left untreated. Because early symptoms like bloating and abdominal pain are non-specific, the condition is frequently overlooked.

Rather than accepting standard medical management, Johnson plans to push the boundaries of experimental science to find a cure. "Current medical standards treat AIG as something to be managed, not resolved. We want to change that," he wrote. "In the age of AI, multiomics and custom-built DNA, proteins and cells, no conditions should be presumed incurable simply because no one has yet cured it with today's stack."

His team is exploring AI-designed antibodies to target the specific immune cells attacking his stomach lining. Medical professionals, however, have cautioned that the relentless pursuit of perfect health can carry its own risks.

Autoimmune specialist Justin Janoska noted that constant testing contributes to "chronic stress on the body," while physician Bradley Campbell highlighted the need to consider emotional health. As European capital flows into longevity startups, Johnson’s experience illustrates the gap between consumer expectations and biological realities.