Excessive Alcohol is Bad For Weight Control and Nutrition
When trying to lose weight, or maintain a healthy weight, an excessive alcohol intake makes it harder to ingest adequate nutrition while remaining within your calorie allowance. Meaning: drinking alcohol when following a weight loss diet is bad, either because you eat too many calories and gain weight, or because the non-nutritional calories in alcohol are likely to cause you to go without essential minerals and vitamins.
Courtesy - Diet-I