How do you deal with the extra pounds/kilograms you put on your body? Some people exercise, others starve themselves after the holidays, some don't even take all of those sweets/fattening foods into their bodies in the first place, and some take diet pills. I'm not here to tell you which one is right or wrong (besides, I think you already know). I would simply advocate for water.
Whichever of the above you choose to do, water helps us to keep healthy. Our body is nearly 70% water and, if you choose to take in those extra holiday calories, water can help break it down and your body to expel the unnecessary things from your body. Simply drinking two glasses of water right when you get up in the morning can, in and of itself, help you loose weight.
If water, drinking 1/2 gallon (which is 8 cups of water) to a gallon, is simply not cutting off the weight, try exercise as well. You're not trying to run a marathon here, just trying to shed some extra weight. It's recommended to exercise moderately for 30 minutes a day most days of the week for health and weight control. More is better, of course, but start where you can.
If water and exercise is not cutting it, maybe you're taking in too many calories for the amount of activity you do each day. If you don't burn off the calories through activity that you take in each day, try cutting it down. The portions at fast food restaurants are WAY TOO LARGE, but, if you just have to have your burgers and fries, try a kid's meal. Those portions are more what we need and most fast food restaurants don't ask whether or not you have kids when buying a kids' meal.
If these above suggestions aren't working, or you don't have enough self control to do the suggestions, maybe we need to talk. There may be a reason subconsciously that you are keeping the weight. Maybe it's a defense tactic or a way to have control in a life of chaos. I don't know, but let me help you figure it out.