Cocktails could pack on the pounds this holiday season

The average serving of one ounce of 80-proof alcohol contains about 90 calories. Ouch. And that's before mixers. Ouch. According to the linked article, a Pina Colada has more calories than a Big Mac. That hurts.

This may make a dent in your plans for holiday revelry.

Interestingly, while beer is usually singled out as the alcoholic beverage most likely to expand your waistline, drinks like vodka, gin, rum and whiskey actually have more calories than beer -- calories that are stored in the abdomen. Mix that spirit with orange juice (56 calories) or, worse, Coca Cola (105 calories), and you're headin' for trouble.

Not that this will keep you from drinking, but for those who are trying to watch their weight this holiday season, there are a few guidelines you can follow to keep an eye on those calories. Try drinking "on the rocks," for instance, and skip the extra calories from a mixer. You should also avoid drinks with several types of liquors and additives, like a Long Island iced tea.

For a little extra fun, see how much of this you and your friends retain at the beginning, middle, and end of your night out -- loser buys the next round!