Set boundaries with your foodie friend, suggests Conason. Make it clear what you're willing to eat and what you're not willing to eat. Simpson says preparing for your night out by snacking healthily on things like nuts and fruit beforehand can help you resist whatever of-the-minute concoction the foodie is pushing your way.

Alternatively, try bartering your activities with your friend. For every restaurant opening you attend with her, she has to go to a workout class or raw restaurant with you. When she's huffing and puffing her way through cardio barre for the third time in a week, or choking down cold green pea soup, she'll get the picture that not everyone has to love the same things.

A close cousin to the foodie, the over-orderer thinks of eating out as the perfect time to indulge. Buttered biscuits, spinach-artichoke dip and oysters with three kinds of dipping sauces to start, red wine all around, and multiple courses before you polish things off with a few samples from the decadent dessert menu is just a standard night out with this buddy. Before you know it, your stomach is beyond full (and your wallet is pretty empty after splitting the check).

"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.