Alcohol provides energy or calories, without directly raising blood sugar. (It may lower it however) These extra calories can increase your weight slightly.

The body sends alcohol to the liver where it is metabolized first before other carbohydrates, so other consumed carbs are then stored as fat.  

In small amounts, alcohol is relatively harmless—one glass of dry wine or  light beer with dinner—but if you’re the type who can’t limit drinking, it’s best to avoid it entirely.

Mixed drinks and dessert wines and normal beer are loaded with carbohydrates, so they’re best avoided. Some exceptions would be a dry martini or mixed drinks that can be made with a sugar-free mixer, such as sugar-free tonic water.

As long as you aren’t looking to lose weight, a modest drink here or there shouldn’t make much of a difference. If you’re looking to lose weight, however, we’d suggest avoiding alcohol altogether.

If you’re an insulin-dependent diabetic, you need to be cautious about drinking. As it can lowers blood glucose (for up toe 12 hours). As intoxication and low blood glucose symptoms are similar you may confuse being tipsy with low blood glucose. Keep on testing your blood glucose level.