People with blood type B carry a 28 percent higher risk of developing type 2 diabetes compared to those with other blood types, according to a comprehensive 2024 umbrella review.
Researchers analyzed 51 systematic reviews encompassing 270 health outcome associations. Only the connection between blood type B and diabetes showed convincing statistical evidence.
The study, led by epidemiologist Fang-Hua Liu from China Medical University, examined data from PubMed, Web of Science, and other major databases through February 2024.
While significant, the blood type risk remains modest compared to lifestyle factors. Processed meat consumption increases diabetes risk by 37 percent, while sedentary lifestyles raise it by 112 percent.
The research did not explore underlying mechanisms driving the blood type connection, though gut microbiome involvement is suspected. The findings highlight the need for more rigorous studies examining blood type relationships with disease.