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Types A, B, AB: heart disease
Types A, B, AB: heart disease
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Non-O blood types have 25 to 30 percent higher levels of blood-clotting proteins known as von Willebrand factor and factor VIII. In part, because of that difference, these people also have a 15 per cent greater risk of dying from heart disease compared to people with other blood types, according to 2015 research from BMC Medicine.