In a Nutrition course at UC San Diego, I learned that two drinks a day is best. If you have less than two drinks a day, you tend to form stress-related illnesses later in life. If you have more than two drinks a day, you tend to form all sorts of other ailments.
The dosage can be two pints of beer, two glasses of wine, two shots of the hard stuff, or any combination of them, just as long as you have two drinks, no more, no less.
Over the years, I continue to hear this advice every so often on the news.