The State of Obesity: Better Policies for a Healthier America * Obesity Rates & Trends * Adult Obesity in the United States Adult Obesity in the United States obesity rates now exceed 35 percent in five states, 30 percent in 25 adult obesity rate at 37.7 percent and Colorado has the lowest at 22.3 percent. The adult obesity rate decreased in Kansas between 2015 and have shown overall leveling off of obesity rates in recent years. Adult Obesity Rate by State, Adult obesity rates, * About State of Obesity The State of Obesity is a project of the Trust for America's Health