A total of 40 adults [ mean sd body mass index 36 3 kg/m ( 2 ) , age 48 9 years , glycated haemoglobin ( HbA1c ) 9.7 2 % ) undergoing bariatric surgery [ Roux-en-Y gastric bypass ( RYGB ) or sleeve gastrectomy ( SG ) ] were enrolled in the present study , the Surgical Treatment and Medication Potentially Eradicate Diabetes Efficiently ( STAMPEDE ) trial .