Some preliminary studies have observed that people with blood type O appear to have certain long-term health advantages . This group, the most common worldwide, has been linked to a lower risk of cardiovascular diseases , such as heart attacks and strokes. It has also been associated with a lower incidence of some types of cancer and with a clotting system that promotes better blood circulation. More efficient tissue oxygenation could contribute to slower aging and better preservation of vital organs.
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In contrast, those belonging to blood groups A , B ,
