With the holidays already in full swing, it's easy to let your healthy habits fall to the wayside. Between on-the-go meals, savory feasts, and skipped gym trips, you may find yourself stepping on the scale and saying ho-ho-holy cow I've gained weight.

One way to help avoid this happening is to be cognizant of the calories you drink. Specifically, those sourced from drinks containing alcohol. A single vodka martini packs 165 calories, a designer beer has 170 calories, a gin martini contains 200 calories, and a Red Bull and Vodka kicks you with 210 calories.

Worse yet, drinking alcohol lowers inhibitions. So, not only will you suddenly have the courage to jump up on the bar and start dancing, but you will also be more apt to reach for a late-night slice or five of pizza. Bad decisions beget bad decisions.

To avoid this calorie disaster, try either abstaining from alcohol entirely, or (when that doesn't work) reach for less calorie-laden drinks, such as a Bacardi and Diet Coke (100 calories) or a glass of red wine, which is lower in calories and also provides you with healthy antioxidants.