Diabetes mellitus is a metabolic disorder resulting in hyperglycemia and disturbances of carbohydrate, fat, and protein metabolism. It is caused by a relative or complete lack of insulin or a defect in the normal action of insulin. It is one of the most common chronic diseases, with increasing incidence worldwide. Some patients present with acute symptoms. Others remain undiagnosed owing to the subclinical phase of the disease, particularly in type 2 diabetes. People with...