11 People Who Could Wreck Your Diet

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The food critic

"You have to try the Alfredo sauce—it's the restaurant's signature dish!" "Don't order salad. Let's just have a good time!" Your foodie friend's opinions on your restaurant order can easily undermine your efforts.

Stay on track: People who succeed are up front, says Dr. LaPort. "Say something like, 'I'm on a diet and would like you to help me.'" A good friend will stop making comments about your food choices if you ask them to directly.

Next: The sports fan