What is Diabetes Mellitus
A condition characterised by elevated blood sugar resulting from defects in insulin secretion, insulin action or both.

There are two major types;

Type 1 Diabetes Mellitus is characterized by insulin deficiency secondary to destruction of some special cells in the pancreas called beta cells.
Affects about 10% of Diabetes.

Type 2 Diabetes Mellitus is characterized by insulin resistance and relative insulin deficiency.
Affects about 90% of Diabetics.