Certain traditional wine-making areas in Sardinia and the Republic of Georgia are areas noted for their high number of centenarians and researchers have established that the wines have a higher polyphenol content than most. The reason seems to be that the vineyards are at higher altitudes, possibly affecting the levels of UV light the grapes are exposed to. Australian wines for example, from grapes grown at low altitudes, are not as high in polyphenol content.

Not everyone wants to drink wine, however, luckily there are other sources of these compounds that one can drink; green tea, pomegranates, honey and cocoa are good alternatives. The chocolate manufacturing process tends to destroy polyphenols so chocolate only contains about 5% of the original amounts. Fresh cranberry juice is as good as red wine but the juice sold in shops has lower levels than fresh cranberry juice. Pomegranate juice is probably the best source.

As a guide to equivalence two glasses (250ml) of red wine should have as much as 10 cups of green tea, six cups of cocoa, four glasses of cranberry juice or one glass of pomegranate juice. Bear in mind though, as already explained, levels vary greatly depending upon the source and method of producing the various drinks. There are of course many food sources – vegetables such as broccoli, celery, onions and cabbage and fruits such as grapes, apples and pears. A healthy diet with plenty of fruit and vegetables will give you a satisfactory intake.

via Why Red Wine Is Good for the Heart.