Obesity in the US Fast Facts (CNN)Here's a look at obesity in the United States. A person is Obesity can increase the risk of several types of medical issues Obesity rates by state in the U.S. Obesity rates by state in the U.S. Obesity rates by state in the U.S. Obesity effects 37.9% of American adults over 20. The annual medical costs for obesity in the United States is $147 The groups with the highest rate of obesity are non-Hispanic blacks In 2014, no state had an obesity rate below 20%. In Arkansas, a healthy life style to combat obesity. effort to combat obesity continues. The dietary guidelines are December 2011 - The Fifth Circuit Court rules that "severe obesity obesity. significant change in the obesity level, which remains above 36% for prevalence of obesity was higher in women (38.3%) than in men (34.3%)."