Diabetes interferes with the body's ability to store energy from food. The pancreas makes a substance called insulin, which helps store energy from food. Type 1 diabetes (juvenile diabetes) occurs when the pancreas stops making insulin. In type 2 diabetes (adult-onset diabetes), the body makes enough insulin but cannot use it normally. In both cases, the result is high blood sugar levels. Over time, high blood sugar levels can lead to blindness, kidney failure, nerve damage, and heart disease. Fortunately, good care with diet; exercise; and medications to control blood sugar, blood pressure, and cholesterol levels helps to prevent these complications. Type 1 diabetes is usually diagnosed promptly. However, many people with type 2 diabetes have the disorder for years before symptoms begin. Testing people who have no symptoms to try to detect disease early is called screening. In 2003, the U.S. Preventive Services Task Force recommended that adults who have high blood pressure or cholesterol levels should be screened for type 2 diabetes. The economic implications of these recommendations are unknown.