A condition in which the body is not able to satisfactorily process ingested sugar. Body and brain cells need many different types of nourishment, one of which is sugar. The circulatory system carries sugar and transfers it ti the cells with the aid of a chemical substance called insulin. The pancreas, located in the abdominal cavity, manufactures insulin. When the insulin production and sugar are in balance, the body functions normally. An individual suffering from a reduction in the production of insulin is said to have diabetes mellitus.