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According to a June study in the Journal of the American Medical Association, eating one small square of very dark chocolate lowers systolic (the top number) blood pressure by about three points and diastolic (the bottom number) blood pressure by about two points.
You must stick to dark chocolate that's at least fifty percent cocoa: white or milk chocolate won't do the trick. The effect may be due to the flavanols contained in cocoa; or the dark chocolate might increase levels of nitric oxide, which lowers blood pressure by relaxing blood vessels.
In any case, don't eat more than a tiny bite: it's all you need, and we all know what too much chocolate can do.
Source: JAMA, June 2007