Diabetes is a disease that affects how the body uses glucose, the main type of sugar in the blood. There are two major types of diabetes: type 1 and type 2. Both type 1 and type 2 diabetes cause blood sugar levels to become higher than normal, but they cause it in different ways. In type 1 diabetes, your child's immune system attacks and destroys the cells in the pancreas that produce the hormone called insulin. Insulin is needed to get glucose into the cells. Type 2 diabetes results from the body's inability to respond to insulin normally. Most people with type 2 diabetes can still produce insulin, but not enough to meet their body's needs. Read more.