Final answer:
Diabetes mellitus is a group of metabolic disorders characterized by elevated blood glucose levels. It is caused by a combination of insulin resistance and impaired insulin production.
Step-by-step explanation:
Diabetes mellitus is a group of metabolic disorders characterized by elevated blood glucose levels. It is a multifactorial disorder in which a combination of insulin resistance and impaired insulin production lead to loss of glucose control and high levels of blood glucose. Diabetes mellitus can be classified into type 1 diabetes and type 2 diabetes based on the underlying causes and mechanisms.