Remember, your body doesn’t know or care that it's Christmas weekend. While it may be perfectly reasonable to have extra calories over the next few days, do it in a deliberate and planned way, instead of just allowing yourself to eat more and telling yourself that it doesn’t count. Also, if you eat extra in a planned way, you’ll enjoy it more because you’ll know that it’s part of your plan for the day, and you’ll be on track the whole time so you’ll have nothing to recover from.