Diabetes mellitus type 2 is a long-term metabolic disorder that is characterized by high blood Diabetes mellitus type 2. Synonyms, Noninsulin-dependent diabetes mellitus (NIDDM), adult-onset diabetes . The development of type 2 diabetes is caused by a combination of lifestyle and genetic factors. While some of these Causes: Obesity, lack of exercise, genetics. Jan 5, - Diabetes, often referred to by doctors as diabetes mellitus, describes a group of metabolic diseases in which the person has high blood glucose Missing: adult | Must include: adult.