Harvard Heart Letter

Blood type associated with risk

If you have type O blood, you may have a lower risk of developing coronary artery disease than people with other blood types. Researchers at the Harvard School of Public Health looked at two long-term studies involving 27,400 men and 62,000 women, and correlated their heart health with their blood type. As published in the Oct. 3, 2012, issue of the Journal of the American Medical Association, they found that people with type O had the lowest risk of heart disease. Those with type A blood were 5% more likely to develop coronary artery disease than those with type O. Those with type B had a 10% higher risk, and type AB was associated with a 23% higher risk.

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