"A social environment increases the likelihood of eating less mindfully," says Simpson. She suggests planning ahead for your big night out (i.e., restricting your diet in the days before), so that you feel comfortable enjoying it. In fact, according to Conason, indulging occasionally will help your diet stay on track. "A night out of eating shouldn't trigger a panic attack. Instead of white-knuckling your way through a meal with others, tune in to your body and allow yourself to have what you want," says Conason.

As for the 15 appetizers you could do without ...
If you're not in the mood to eat multiple courses, just say at the beginning that you brought cash and you'll be ordering your own food," says Conason. Try suggesting vegetarian restaurants, which are likely to have healthier options. Or invite everyone over for a potluck style supper club -- they're less likely to harp on your healthy choices if you're not announcing them from the menu as you put in your order.