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Just say no—everywhere

Willpower is like a muscle: Work it and you get stronger. What's key is to practice keeping yourself in check in non-food situations, too. "Whether you're driving in rush hour traffic or dealing with a temperamental kid, there are challenges that require self-control," Dr. Dansinger says.

Succeed in not honking at that rude driver, he explains, and you'll be better able to resist dessert at the party.

Next: Avoid banking calories