Diabetes affects 20.8 million children and adults in the United States, or 7% of the population, according to the American Diabetes Association, Alexandria, Va. (phone 800-342-2383, www.diabetes.org). It is a disease in which the body does not produce or properly use insulin, which is needed to convert sugar, starches, and other food into energy. Type 2 diabetes is the most common form and occurs when the body does not produce enough insulin or the cells do not respond to the insulin.