Wide sections of the Southeast, Appalachia, and some tribal lands in the West and Northern Plains have the nation's highest rates of obesity and diabetes, according to estimates released today by the Centers for Disease Control and Prevention. In many counties in those regions, obesity rates exceed 30% and diabetes rates 10%, according to the agency's Behavioral Risk Factor Surveillance System. CDC said the data can help public health agencies, health care providers and policymakers focus prevention efforts on high-risk regions. Nationally, the agency estimates that 26% of adults are obese and 8% of residents have diabetes.