I feel very strongly that if we celebrate well (that's not stuffing yourself until you feel ill or getting drunk) then moderation the rest of the time is much easier. I know for some here there's a transition that happens where traditional celebratory foods are no longer appealing, but I would find that idea quite offputting. I believe that celebration involving special foods is common to all cultures, so it may be something very important to us as a species and has only gone awry amidst general plenty.
Happy Christmas!