According to research published today in the Journal of the American Heart Association, open access, peer-reviewed journal of the American Heart Association, drinking two or more cups of coffee a day may double the risk of death from cardiovascular disease among people with severe high blood pressure (160/100 mm Hg or higher), but not among people with high blood pressure that is not considered severe. However, despite the fact that both beverages contain caffeine, the study indicated that drinking one cup of coffee or one cup of green tea every day did not raise the risk of dying from cardiovascular disease at any blood pressure measurement. The FDA estimates that a cup of green or black tea contains 30 to 50 milligrams of caffeine, whereas a cup of coffee contains more like 80 to 100 mg. Previous research found that drinking one cup of coffee a day may help heart attack survivors by lowering their risk of death after a heart attack and may prevent heart attacks or strokes in healthy individuals.
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