What is Diabetes? Diabetes is a disease where the body cannot properly produce or use insulin. Insulin is a hormone that turns the foods you eat into energy. If your body cannot turn food into energy, not only will your cells be starved for energy, you will also build up glucose (sugar) in your blood. This will lead you to have "high blood glucose levels." Over years, the high blood glucose level can damage major organs like your heart, eyes, and kidneys. Statistics: According to the A.