Diabetes is a disease in which blood sugar, or blood glucose, levels are too high. Glucose comes from the foods you eat. Insulin is a hormone that helps the glucose get into the cells to give them energy. With type 1 diabetes, the body does not make insulin. With type 2 diabetes, the more common type, the body does not make or use insulin well. Without enough insulin, the glucose stays in the blood. You may also have prediabetes. This means that the blood sugar is higher than normal but not high enough to be called diabetes. Those with prediabetes may not have any symptoms but do have a much higher risk of developing type 2 diabetes.