If your social life is on the upswing and you find yourself having a few more cocktails than usual, it could be working against your efforts to lose weight. Alcohol is full of calories! It can be the difference between weight loss, maintenance or gain. For example, one glass of beer or wine can contain close to 100 calories. If you're having a couple of drinks with your pals a few nights a week, you could be adding 1,000 unexpected calories to your diet.

Also, alcohol acts as an appetite stimulant, and thus can lead you to indulge in foods that aren't consistent with your diet plan. So, if you're dieting, keeping your alcohol intake to a minimum can help you keep your eating habits on track.