Welcome back. Hopefully if you're reading this you are well under way to getting your head around staying lean during Christmas
There are only two main drivers of human behaviour; reward and pain. The question for you quickly becomes this; what do you want more?
How many people do you know who starve themselves with the aim of lowering their body fat, losing weight or 'toning' up? You may have even tried it yourself. You probably found it worked at first, but soon tailed off. What did you do? Probably what most people do in that situation; lower the amount of food you eat again.