Nothing screams, "I'm on a diet," more than ordering a salad at dinner. While everyone else is indulging in cheeseburgers and pizza, you're rolling that cherry tomato around with your fork, willing it to turn into a mozzarella stick. However, the salad dressing may be just as bad for you as whatever your friends are having.

"As a nutritionist, I often find salad dressings are sabotaging many weight loss efforts," Millie Shedorick, a registered dietitian, told me. "Only two tablespoons of most regular dressings contain approximately 200 calories of just fat. Many salads contain more than two tablespoons of dressing, adding an extra 200 calories or more."

So what if you really do love salads? You can still have what you want, but just be smart about how you order it. "When ordering salads or sandwiches, always ask for 'no dressing' or to serve it on the side so you are aware of what you are adding," recommended Shedorick. "You can squeeze a lemon on your salad or use vinegar for no added calories, or try a low fat dressing for half the calories."