In a startling revelation that has sent ripples through the biohacking community and beyond, Bryan Johnson, the millionaire entrepreneur renowned for his radical health experiments, has disclosed that he is grappling with an incurable autoimmune disease. The 48-year-old, who has dedicated years to reversing his biological clock, took to social media last week to share the news of his diagnosis—autoimmune gastritis—while reflecting on the lifestyle choices that may have contributed to his condition.
A Journey of Self-Discovery
Johnson’s health odyssey began with a quest to “defeat death,” a mission he chronicled in the 2025 Netflix documentary *Don’t Die: The Man Who Wants to Live Forever*. His radical approach to biohacking has drawn attention for its extreme measures, including a vegan diet meticulously tailored to limit caloric intake and an array of supplements aimed at rejuvenating his body. However, the diagnosis of autoimmune gastritis—a condition where the immune system erroneously attacks the stomach lining—marks a significant hurdle in his journey.
“My stomach is eating itself,” Johnson lamented in a post on X (formerly Twitter) dated June 30. He candidly shared that he had been living with the disease without realising it, attributing its onset to a history of unhealthy eating habits, including a fondness for sugary cereals and fast food during his youth.
The Battle with Autoimmune Gastritis
The entrepreneur’s reflections on his past reveal a tumultuous relationship with health. Johnson confessed, “As a kid, I ate sugar cereal, drank sugary soda, and gobbled down fast food.” Balancing the demands of fatherhood and entrepreneurship took a toll on his well-being, leading to weight gain and bouts of chronic depression. It was during this challenging period that his body began to develop an autoimmune response, first targeting his thyroid and later his stomach lining.
In his candid assessment, Johnson noted that autoimmune gastritis can lead to severe complications, including nutritional deficiencies, anaemia, and increased cancer risk. “When AIG is discovered today, standard medical care concedes defeat,” he explained, adding that the prevailing medical advice is often limited to managing symptoms rather than seeking a cure.
A Determined Approach to Healing
Despite the daunting nature of his diagnosis, Johnson remains resolute in his pursuit of solutions. He intends to monitor various health metrics, such as ferritin and iron levels, and to undergo repeated biopsies in search of potential treatments. “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,” he asserted, embodying his belief in the transformative potential of modern science.
His determination is emblematic of the biohacking philosophy, which emphasises self-experimentation and the pursuit of personalised health solutions. Johnson’s annual expenditure of approximately £1.6 million on health interventions underscores a commitment to finding answers, even if it means venturing into uncharted territory.
Why it Matters
Bryan Johnson’s journey encapsulates the complexities of navigating health in an age of rapid scientific advancement and personal accountability. His story serves as a poignant reminder that even the most ambitious efforts to defy nature can be met with unforeseen challenges. As he continues to share his experiences, Johnson not only raises awareness about the implications of autoimmune diseases but also sparks a broader conversation about the limits of biohacking and the importance of a balanced approach to health. In a world increasingly obsessed with longevity, his battle becomes a testament to the unpredictable nature of the human body and the relentless pursuit of wellness.