LEP and type 2 diabetes mellitus: A total of 68.7% of T2DM patients who underwent RYGB and 30.2% of GB candidates were in remission at the three-year follow-up. The predictive factor for remission with both surgeries was low HbA1c without the need for insulin therapy. For GB it was lower weight, while for RYGB they were higher fasting C peptide level and lower leptin-to-fat mass ratio