More than one-third (37.7%, or 91.4 million) of U.S. adults are considered obese, which is among the highest obesity rates in the world. The condition shows a marked socioeconomic gradient, with significantly higher rates among minorities and the poor, and is associated with an increased risk of preventable chronic diseases, such as heart disease, stroke, and Type 2 diabetes. Estimates of the annual medical costs of obesity range from $147–$210 billion, approximately 40% of which is financed by Medicare and Medicaid.