A little tip, yet it is very simple and widely know but it is still a very good tip for losing fat in the holidays:
Eat 5-8 medium meals a day instead of 3 big meals.
This will help you so you don't eat a lot of crap. It will also make your insulin levels stay more stabil and that will cause your body to burn of more fat. The reason for that is that, when your body's insulin level is high it will burn the calories you have just eaten, but when your insulin level is low it will burn the fat cells for energy.
That was a tip for fat loss, be sure to look up at the nutrition page here.