"Your blood type could indicate your risk for heart disease."
According to a study in the journal Arteriosclerosis, Thrombosis and Vascular Biology, people with type O have a decreased risk for heart disease compared to those with types A, B and AB. Type O is the most common blood type (about 43% of Americans have it). Compared to them, people with type A have a 5% increased risk for heart disease and people with type B have an 11% increased risk. People with AB, which is the rarest blood type (only about 7% of Americans have it), showed the highest increased risk -- a 23% jump. The research is based on two major U.S. studies, the Nurses' Health Study and the Health Professionals Follow-up Study (covering data from some 90,000 people