INS and type 2 diabetes mellitus: For example, higher levels of presurgical body mass index (BMI) and fasting C-peptide, a shorter duration of T2DM, younger, a lower level of HbA1c, no use of insulin, and no use of sulfonylureas or insulin-sensitizing agents other than metformin are predictors of an increased likelihood of T2DM remission after bariatric surgery.