You overindulge on Thanksgiving and then vow not to do the same on Christmas. Then Christmas comes and the pies and cookies and peppermint-sprinkled cupcakes are too delicious-looking to resist. Then, a week later, it's New Year's Eve, and you have a few too many glasses of Champagne. And it's OK to enjoy all these things. It's healthy to not be so restrictive with your diet that you can't enjoy yourself.