The pancreas makes insulin, a substance that helps the body store energy from food. Diabetes mellitus interferes with the body's ability to store energy from food. Type 1 diabetes mellitus (also called juvenile diabetes) occurs when the pancreas stops making insulin. Type 2 diabetes mellitus (also called adult-onset diabetes) occurs when the body makes plenty of insulin but cannot use it normally. In both types, 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 level, blood pressure, and cholesterol levels can prevent complications. However, people with diabetes generally do not live as long as people without diabetes.