Type 1 diabetes is a disorder in which the body does not make insulin. Insulin is a hormone that helps the body convert food into energy. Without insulin, glucose (sugar) from the food you eat cannot enter cells, causing your body tissue to become starved for energy.
American Diabetes Association
http://www.diabetes.org
Juvenile Diabetes Foundation International
http://www.jdf.org
National Institute of Diabetes and Digestive & Kidney Diseases
http://www.niddk.nih.gov