Blood group helps determine a person's risk of heart disease, a study has found.
People from groups A, B and AB are more at risk than those with the more common blood type O, research shows.
Individuals with the rarest blood group, AB -- found in about 7pc of the population -- were by far the most vulnerable.
Compared with people having blood group O, their chances of suffering heart disease were raised by 23pc.
Group B blood increased the risk by 11pc, and type A by 5pc.
"While people cannot change their blood type, our findings may help physicians better understand who is at risk for developing heart disease," said lead researcher Professor Lu Qi, from the Harvard School of Public Health in Boston, US.
"It's good to know your blood type the same way you should know your cholesterol or blood pressure numbers. If you know you're at higher risk, you can reduce the risk by adopting a healthier lifestyle, such as eating right, exercising and not smoking."