Health effects of wine
The health effects of wine (and alcohol in general) are the subject of considerable ongoing debate and study. In the USA, a boom in red wine consumption was touched off in the 1990s by '60 Minutes', and other news reports on the French paradox.
It now seems clear that regular consumption of up to 1-2 drinks a day (1 standard drink is approximately equal to 5 oz, or 125 ml, of 13% wine) does reduce mortality, due to 10%–40% lower risk of coronary heart disease, for those over the age of 35 or so (see Alcohol consumption and health). Originally, the effect was observed with red wine. Compounds, known as polyphenols, are found in larger amounts in red wine, and there is some evidence that these are especially beneficial. One particularly interesting polyphenol found in red wine is resveratrol, to which numerous beneficial effects have been attributed. Red wine also contains a significant amount of flavonoids and red anthocyanin pigments that act as antioxidants. With excessive consumption, however, any health benefits are offset by the increased rate of various alcohol-related diseases, primarily cancers of mouth, upper respiratory tract, and ultimately, cirrhosis of liver.
Other studies have shown that similar beneficial effects on the heart can be obtained from drinking beer, and distilled spirits. However, recent studies show that only red wine reduces the risk of contracting several types of cancer where beer and other alcoholic beverages show no change. Dr. Sinclair of Harvard University and others claim that resveratrol is the active molecule responsible for the significant difference in lowering cancer risks and that the required amounts are only found in red wine. Trace amounts of resveratrol exist in grapes, white wine and peanuts.
Sulfites (or sulphites) are chemicals that occur naturally in grapes and also are added to wine as a preservative. They can trigger a severe and life-threatening allergic reaction in a small percentage of consumers, primarily asthmatics. In the USA nearly all commercially produced wine, including that with no added sulfites, is required to state on the label "contains sulfites." In other countries they do not have to be declared on the label, leading to a common mistaken belief that only wine from the USA contains sulfites. Many consumers who have adverse reactions to wine, such as headaches or hangovers, blame added sulfites but are probably reacting instead to naturally-occurring histamines. The quantity of sulfites in a glass of wine is the same as in a serving of dried apricots.
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