While the increased risk is small (types A or B had a combined 8% higher risk of heart attack and 10% increased risk of heart failure, according to one large study) the difference in blood clotting rates is much higher, per the AHA. People with type A, type B or type AB blood are more likely than people with type O to have a heart attack or experience heart failure, according to the American Heart Association. The blood types most at risk for heart disease "In short, it's almost like the body has evolved around its environment in order to protect it as best as possible," Guggenheim said. While our blood can't keep up with the different biological or viral threats going around in real time, it may reflect what's happened in the past. People with type O blood may get sicker with cholera, for example, while people with type A or B blood may be more likely to experience blood clotting issues. Douglas Guggenheim, a hematologist with Penn Medicine. People with type O-negative blood are considered " universal donors" because their blood doesn't have any antigens or proteins, meaning anyone's body will be able to accept it in an emergency.īut why are there different blood types? Researchers don't fully know, but factors such as where someone's ancestors are from and past infections which spurred protective mutations in the blood may have contributed to the diversity, according to Dr. The ABO system is the best known way of classifying blood types.
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