A subtype of DIABETES MELLITUS that is characterized by INSULIN deficiency. It is manifested by the sudden onset of severe HYPERGLYCEMIA, rapid progression to DIABETIC KETOACIDOSIS, and DEATH unless treated with insulin. The disease may occur at any age, but is most common in childhood or adolescence.

Synonyms: Juvenile Onset Diabetes, Ketosis-Prone Diabetes Mellitus, Autoimmune Diabetes, IDDM, Insulin-Dependent Diabetes Mellitus, Diabetes Mellitus, Juvenile Onset, Insulin Dependent Diabetes Mellitus 1, Diabetes, Type 1, Sudden-Onset Diabetes Mellitus, Diabetes, Juvenile-Onset, Diabetes Mellitus, Type 1, Diabetes Mellitus, Insulin-Dependent, 1, Diabetes Mellitus, Insulin Dependent, Diabetes, Autoimmune, Brittle Diabetes Mellitus, Juvenile-Onset Diabetes, Diabetes Mellitus, Insulin-Dependent, Diabetes Mellitus, Juvenile-Onset, Diabetes Mellitus, Sudden-Onset, Type 1 Diabetes, Diabetes Mellitus, Type I, Insulin-Dependent Diabetes Mellitus 1, Diabetes Mellitus, Sudden Onset, Type 1 Diabetes Mellitus, Juvenile-Onset Diabetes Mellitus, Diabetes Mellitus, Ketosis Prone, Diabetes Mellitus, Ketosis-Prone, Diabetes Mellitus, Brittle