11 People Who Could Wreck Your Diet

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The insecure spouse

Sometimes an insecure person seeks out an overweight partner to alleviate his or her own insecurity, says Peter LaPort, MD, medical director of MemorialCare Center for Obesity at Orange Coast Memorial Medical Center in Fountain Valley, Calif. "It's usually very subtle, but a normal-weight husband may, for example, order something he knows his overweight wife wants but shouldn't eat," Dr. LaPort says. Your spouse may fear you'll leave him behind or you are no longer the person he married.

Stay on track: It's best to confront your spouse, says Dr. LaPort. "The best approach for each person varies, but try, 'Do you realize you're undermining my success? Is that what you really want to do? Let's talk about it, because I need your help to succeed.'" Related: 5 Things NOT to Say to Your Partner About Losing Weight

Next: The food critic