Diabetes is a metabolic disorder characterized by hyperglycemia (high blood sugar) and other signs, as distinct from a single illness or condition. There are three main forms of diabetes mellitus: type 1, type 2, and gestational diabetes. Type 1 is usually due to autoimmune destruction of the pancreatic beta cells which produce insulin. Type 2 is characterized by tissue-wide insulin resistance and varies widely; it sometimes progresses to loss of beta cell function. Gestational also involves insulin resistance; the hormones of pregnancy cause insulin resistance in women genetically predisposed to developing this condition .

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