You do not have to gain extra pounds on holidays. Just remember about balance and moderation. You will never gain weight if you burn more calories than you consume.
Stay physically active. Of course, it is easier said than done. But it is always possible to find an activity to enjoy. Limit your television viewing time and go for a walk to see holiday decorations. If the weather keeps you indoors, it's not a problem. Put on your favorite music and dance.
Never skip meals, skip sodas. When you starve yourself, you slow your metabolism down. Do not go to a party hungry because you will be tempted to overeat. Also, try to limit you alcohol intact. Remember, calories add up.
Watch portion sizes. Enjoy your favorite foods but do so in moderation. Prefer a variety of tasty fruits and vegetables to sweets and chocolates.
Fore more information, see
Links:
[1] http://weightloss.about.com/cs/moretips/l/aa121802a.htm
[2] http://www.nichd.nih.gov/new/releases/holidayweightgain.cfm