In 2009, 24 million in the U.S. had diabetes. Another 57 million had pre-diabetes, a condition that increases your risk for diabetes.
At least 23% of U.S. adults over 60 have diabetes.
In 2009, Diabetes Care reported the comparison of lifetime abstainers with alcohol drinkers. The protective “dose” of alcohol is 22–24 grams a day. I’ll leave it to you to figure out how much alcohol that is. Prior studies looking at overall health benefits of alcohol indicate that judicious consumption is ≤ one drink daily, on average, for women, and ≤ 2 drinks a day for men.
Of course, many people shouldn’t drink any alcohol.
Reference: Baliunas, D., et al. Alcohol as a risk factor for type 2 diabetes: A systematic review and meta-analysis. Diabetes Care, 32 (2009): 2,123-2,132.