By Beth Sumrell Ehrensberger, R.D., M.P.H.

When you're trying to lose weight, it seems like everything you do—from what you eat to how you work out—is the subject of scrutiny. And, of course, everyone has an opinion—your mother, your partner and even the supermarket clerk scanning your groceries. Your best defense against those inquiring minds and their inevitable criticism? Apply a positive spin on any uninvited comments. Read on to find out how to keep your cool.

The Criticism: "How's this diet any different from all the others you've failed on before?"
The Comeback: Even if you have been on countless diets, you know you're truly committed to achieving your best self through a healthier lifestyle. So take a deep breath, then think of how you'll use that doubting detractor to motivate you. In some circumstances, extending an invitation to help you succeed can be a good way to turn a critic into a cheerleader.

The Criticism: "I've never heard of a diet that allows chocolate. It seems like a fad to me."
The Comeback: Often times, the person making a comment like this isn't looking to be critical—they're just curious, especially if you've been able to slim down. If you think you can reason with them, explain why a diet that's practical and filled with portion-controlled amounts of all foods is healthy. But if you have a challenger on your hands, simply say, "I know, isn't it wonderful? I've lost weight and I feel great!"

The Criticism: "You're no fun anymore—I liked it better when we could split dessert."
The Comeback: The ultimate goal is to spend time together and have fun, so think of some non-food related activities that you and your companion would enjoy. Strike out and try something you've never done before, like dance lessons or an art class.

How to Cope With Criticism, and other weight-loss and fitness tips from Bob Greene, Oprah's trainer.