He says that if you want to reap the heart-health benefits of drinking, consistency is key: two or three drinks per day for an average man, and one or two for a woman. A drink, he notes, is a 5-ounce serving of wine, or a 12-ounce serving of 5 percent-alcohol beer.
via If You're Toasting To Health, Reach For Beer, Not Sparkling Wine : The Salt : NPR.