Overview
- Johnson disclosed in a public post that he received the diagnosis after specialized blood tests showing high anti–parietal-cell antibodies and a stomach biopsy that confirmed early mucosal damage.
- Doctors say autoimmune gastritis makes the immune system attack stomach cells, which can stop the body from absorbing iron and vitamin B12 and raises long-term stomach cancer risk.
- Johnson reported an unexplained, low ferritin level for about eleven years and a prior autoimmune thyroid disease that he believes form a linked autoimmune pattern.
- He has started iron infusions, increased blood monitoring and plans repeated endoscopic biopsies while exploring experimental, tailored therapies with AI and multiomic tools.
- As a well-funded, high-profile longevity entrepreneur who documents his data, Johnson argues standard care accepts the disease as incurable and he hopes his efforts will test new avenues though those efforts are still early and unproven.