Given that any amount of alcohol has been shown to be harmful to health, the probable benefit, if any, of that glass of wine is the socializing that goes with it. Buttner and others have found that a rich and loving social life trumps most other considerations for aiding longevity. He also found that daily low to moderate hours of exercise seem to be key. Walking, particularly with hills to climb or descend, gardening, hand tool wood working or other creative endeavors, these make a big difference...it's not all about diet, though diet is very important.