Alcohol has variable effects on fat stores, depending on the person and how much and what kind of alcohol is consumed. "Beer gut" is not just an urban myth.
Beer has about 150 cals per 12 oz, wine has about 90 per 4 oz, and hard liquor has about 110 per 1.5 oz.
If you eat or drink more calories than you need for basal metabolism and physical activity, you will almost surely gain weight.
That being said, many of the true alcoholics I see are not badly overweight; many are under- and malnourished. The alcohol displaces healthy food intake. Some of the daily-drinking heavy alcoholics "forget" to eat enough food. Or just don't have the appetite for it.
I hope this is helpful to you.
-Steve Parker, M.D.
author of
The Advanced Mediterranean Diet Blog