The glass with five ounces of wine or twelve ounces of beer contains 110 calories. If you drink two or three such alcoholic drinks in a week you will get 2000 calories more than usual. By the way, extra calories is not the worst. In this case you should be wary of effects of alcohol on your hormones.
As you know, ingested alcohol begins to cause a large amount of cortisol. This script associated with stress hormone which is responsible for storing fat. Its large amounts reduce muscle and reduce insulin sensitivity. Its also reduce levels of the leptin hormone which is responsible for the body's metabolism. These hormones are very important especially for weight loss. Next, even small doses of alcohol cause an increase in estrogen levels. It is able to trigger the development of breast cancer.
Remember that the constant drinking of alcohol contributes to weight gain and bad for your health.