One common weight-loss myth is to eat a low-carbohydrate diet and exercise, which can actually cause the body to burn its lean muscle tissue for energy, says registered dietitian Jana Milam of Baptist Medical Center in Jackson, Miss. Other misconceptions are that energy drinks give your workout a boost, diet soda is a good choice for women looking to cut calories, eating at night causes weight gain, and you can't get enough cardio and aerobic exercise.

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