In type I DM true about-

Risk factors include having a family member with the condition.The underlying mechanism involves an autoimmunedestruction of the insulin-producing beta cells in the pancreas] Diabetes is diagnosed by testing the level of sugar or glycated hemoglobin (HbA1C) in the blood. Type 1 diabetes can be distinguished from type 2 by testing for the presence of autoantibodies There is no known way to prevent type 1 diabetes. Treatment with insulin is required for survival.