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You may have heard of the "French paradox." The French diet is very high in saturated fat and cholesterol (just think of pate de fois grasand croissants), yet France has one of the world's lowest rates of heart disease. One theory for this apparent discrepancy is that another major player in the French diet—red wine—protects the arteries of the heart. (Another possibility, perhaps even more likely, is that cutting down on saturated fat is less helpful than previously thought. See the High Cholesterol article and the Antioxidant article for more information.)
Resveratrol is a natural antioxidant found in red wine. Antioxidants protect cells in the body from damage by free radicals, naturally occurring but harmful substances that are thought to play a role...
Very preliminary evidence, such as the results of test tube studies , suggests that resveratrol may help prevent heart disease , 1 2 3 and cancer . 4 5 6 7 8 However, not all studies have been favorable. 9 Furthermore, there is some evidence that resveratrol is immediately broken down by the human liver, and thereby does not, in fact, enter the blood stream at any significant level. 10 In any case, only double-blind studies can prove a treatment effective, and none have been reported with resveratrol. (For information on why such studies are essential, see Why Does This Database Rely on Double-Blind Studies? )
Resveratrol has a chemical structure similar to that of the synthetic estrogenic hormone diethylstilbestrol and it has estrogenic effects. According to one study, it might stimulate the growth of breast cancer cells. 11 For this reason, resveratrol should be avoided by women who have had breast cancer or are at high risk of developing it. Maximum safe dosages for children, pregnant or nursing women, or those with severe liver or kidney disease have not been determined.