Diabetes mellitus is a chronic disease that is caused by deficient activity of the islets of Langerhans. The islets of Langerhans is a part of the pancreas that secrets the hormone insulin, a hormone that functions to allow the utilization of glucose by the body, and therefore maintaining the glucose levels from getting too high. Diabetes mellitus is as a result of the inactivity of the insulin hormone and therefore there will be a high level of glucose in the blood.