Overweight and obesity are caused by many factors, including the contributions of inherited, metabolic, behavioral, environmental, cultural, and socioeconomic effects. Overweight and obesity may raise the risk of illness from high blood pressure, high blood cholesterol, heart disease, stroke, diabetes, certain types of cancer, arthritis, and breathing problems. As weight increases, so does the prevalence of health risks. The health outcomes related to these diseases, however, may be improved through weight loss or, at a minimum, no further weight gain. Because of the importance of these issues, the U.S. Department of Health and Human Services considers overweight and obesity among the 10 leading health indicators in Healthy People 2010, the health objectives for the Nation. The potential benefits from reduction in overweight and obesity are of considerable public health importance.