Rather than keeping a mental list of forbidden foods, learn how to enjoy the tempting foods you crave and feel good about it because that's one of the secrets to life-long weight management, says registered dietitian Carolyn O'Neil, author of The Slim Down South Cookbook. She explains that the allotment for "splurge" calories from sugar, fats and alcohol is about 250 per day for a healthy adult who is moderately active. "If you add more physical activity to your day, you get to add more splurge calories," O'Neil says. "That's the kind of math I like!