Eating less and getting exercise really do work wonders.

If you've tried fad diets, over-the-counter diet pills, liquid diets, and specialty diet foods and products and haven't lost weight, there's still hope. Eat less fat and exercise more may seem like old-fashioned advice, but they are among the most effective ways to lose weight according to new research.
Researchers at Beth Israel Deaconess Medical Center analyzed data collected from over 4,000 obese people picked from the 2001-2006 National Health and Nutrition Examination Survey (NHANES) conducted by the Centers for Disease Control and Prevention. This survey is used to assess the health and nutritional status of people in the United States.
More than a third of Americans are obese and 50 to 70 percent are trying to lose weight... Just a 5 percent reduction in weight can improve health.

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People included in the study had a body mass index (BMI) of 30 or greater 12 months prior to their interview with researchers, and they were all over 20 years old. Among those surveyed, 2,523 reported attempting to lose weight. Forty percent said they had lost 5 percent or more of their weight, and 20 percent reported losing at least 10 percent of their body weight.