The Facts
Diabetes is a condition in which the body cannot properly store and use fuel for energy. The body's main fuel is a form of sugar called glucose, which comes from food (after it's been broken down). Glucose enters the blood and is used by cells for energy. To use glucose, the body needs a hormone called insulin, which is made by the pancreas. Insulin is important because it allows glucose to leave the blood and enter the body's cells. Diabetes develops when your body can't make any or enough insulin, or when it can't properly use the insulin it makes.
There are two main types of diabetes: type 1 and type 2. Type 1 diabetes develops when your body makes little or no insulin. When this happens, glucose can't get into the cells for energy and remains in the blood. Type 1 diabetes also used to be called juvenile-onset diabetes or insulin-dependent diabetes mellitus (IDDM). It affects about 1 in 250 people in the United States, and occurs equally among women and men. Most people develop type 1 diabetes before the age of 30, but in rare cases it can also occur in older adults.