Diabetes is a chronic disease characterized by abnormal metabolism of carbohydrates, proteins and fats leading to hyperglycemia. There are four main types of diabetes: type 1 caused by destruction of insulin-producing beta cells; type 2 caused by insufficient insulin production or cells ignoring insulin; gestational diabetes during pregnancy; and other specific types. Diabetes is diagnosed through four testing options measuring glucose levels. Key aspects of managing diabetes include monitoring carbohydrate and calorie intake, exercising regularly, maintaining normal blood sugar, cholesterol, and blood pressure levels, and receiving routine eye, foot and dental exams.