Moderate consumption of red wine on a regular basis may be a preventative against coronary disease and some forms of cancer. The chemical components thought to be responsible are catechins, also known as flavonoids and related to tannins . Catechins are believed to function as anti-oxidants, preventing molecules known as "free-radicals" from doing cellular damage. One particular form of flavonoid, called oligomeric procyanidin, recently proved to prevent hardening of the arteries.
There are also compounds in grapes and wine (especially red wine, grape juice, dark beers and tea, but absent in white wine, light beers and spirits) called resveratrol and quercetin. Clinical and statistical evidence and laboratory studies have shown these may boost the immune system, block cancer formation, and possibly protect against heart disease and even prolong life.
One recent study, published in the 2004 year-end edition of the American Journal of Physiology, indicates that resveratrol also inhibits formation of a protein that produces a condition called cardio fibrosis, which reduces the heart's pumping efficiency when it is needed most, at times of stress. More evidence suggests that wine dilates the small blood vessels and helps to prevent angina and clotting. The alcohol in wine additionally helps balance cholesterol towards the good type.
http://www.winepros.org/wine101/wine-health.htm
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