More than one-third of adults in the U.S. and nearly 17 percent of the nation’s children are obese. Obesity’s human toll includes diabetes, heart disease, high blood pressure, and some cancers. Relative medical costs of the obese are estimated to be up to 100 percent higher than for Americans of healthy weight. A new report by the Institute of Medicine warns these social and economic costs will increase in the coming years unless we do more to prevent people from becoming overweight — especially young people. And researchers say a real solution will require leadership from educators to employers to the president. Diane and her guests discuss America’s obesity epidemic.