Type I is insulin-dependent diabetes mellitus (IDDM) and Type II is non-insulin-dependent diabetes mellitus (NIDDM). In Type I diabetes there is an absolute deficiency of insulin. It accounts for approximately ten percent of all cases of diabetes and has a greater prevalence in children. In Type II diabetes, insulin secretion may be normal, but the target cells for insulin are less responsive than normal. The incidence of Type II diabetes increases greatly after age 40 and is normally associated with obesity and lack of exercise as well as genetic predisposition. The symptoms of Type II diabetes are usually less severe than Type I, but long-term complications are similar in both types.