Heart Disease

There’s good news for O blood types. Research shows your risk of coronary heart disease tends to be lower. Experts aren’t sure why. Some think it might be because other types are more likely to have higher cholesterol and higher amounts of a protein that’s linked to clotting.

Fertility

Your blood type can’t predict whether you’ll get pregnant, but it may play a role. In one study, women with low numbers of healthy eggs were more likely to have type O blood than any other type. More research is needed to figure out why.

Memory
A small study showed that people with memory problems had type AB blood more than any other.

Stress
Stress boosts your body’s level of cortisol, the stress hormone. People with type A blood tend to have more cortisol, anyway. So you may have a harder time dealing with stressful situations.

Malaria
Type O blood may help ward off this disease. You can get malaria when an infected mosquito bites you. The parasite that causes it has a harder time attaching itself to type O blood cells.