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Yo-Yo Dieting
Most Americans who lose weight on a diet regain about a third of the pounds within one year. Worse, this yo-yo effect appears to be hard on the cardiovascular system. Research has linked weight cycling to an increased risk of heart attack and stroke.

How to atone: From this point on, commit yourself to slow and steady progress; it's the only healthy way to slim down. A national survey published last year identified several practices helpful for reaching your ideal weight and staying there, including: (1) limit carbohydrates; (2) practice portion control; (3) plan before you go grocery shopping; and (4) read nutrition labels.

Next: The vice-o-meter: Dr. Oz helps you kick your worst health habits