"O" is low and people with AB blood type have a 25% higher risk of having a stroke, based on a large study published by researchers from the Harvard School of Public Health. The information was resented at the American Heart Association meeting, with findings derived from two large ongoing studies that have been in place for over 20 years. The study was still not adequately powered to show differences between races or even between hemorrhagic vs thrombotic strokes. Known risk factors for stroke include smoking history, having type 2 diabetes, hypertension, hyperlipidemia. Perhaps this is little more than a warning for those with AB blood type to be sure to manage those other risks much more closely along with the routine advice to stay thin and get regular exercise.
Qi L, et al "ABO blood group and risk of stroke in US men and women" AHA 2011; Abstract 16887
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