If you're emerging from the holidays having put on a little weight, you're not alone: the average person gains about a pound between Thanksgiving and New Year's Day, according to the New England Journal of Medicine. But the good news is that a few simple changes to your routine can help you shed the weight quickly. "After the holidays, it's smart to get back on track by making small, realistic changes, instead of setting yourself up for failure by being overly drastic," says Keri Gans, RDN, a New York City-based nutrition consultant and author of The Small Change Diet.