A small study of 27 healthy but sedentary older men found the antioxidant resveratrol, found in red grapes and red wine, may block the health benefits of exercise. Researchers from the University of Copenhagen reported on the website of the Journal of Physiology that after eight weeks of exercise, men who took a placebo had lower blood pressure and bad-cholesterol levels compared with men who were given a 250-milligram resveratrol supplement.

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