About 1 in 3 U.S. adults have prediabetes, increasing risks for heart disease, stroke, and type 2 diabetes. The National Diabetes Prevention Program, initiated in 2010, aims to prevent type 2 diabetes through lifestyle changes. A study by University of Michigan researchers found participants saved ~$5,000 in medical costs over two years, with no significant change in quality-of-life but a lower probability of developing diabetes.