What is Type 1 Diabetes?

Type 1 diabetes happens when the pancreas produces little or no insulin. Usually diagnosed in childhood, this type used to be called juvenile diabetes. It affects about 5% of all diabetics. We don't know what causes the pancreas to shut down, but it is thought that a virus might trigger an immune reaction, where the body attacks and destroys the pancreas by mistake. People who have relatives with type 1 diabetes are more likely to have it themselves.