A Roux-en-Y gastric bypass will be performed in all the cases. Patients will be randomized according the limb lengths:~Group 1: Alimentary limb 150cm and biliopancreatic limb 100cm~Group 2: Alimentary limb 100cm and biliopancreatic limb 150cm~Weight loss will be evaluated 1 year after surgery
A Roux-en-Y gastric bypass will be performed in all the cases. Patients will be randomized according the limb lengths:~Group 1: Alimentary limb (AL) 150cm and biliopancreatic limb (BPL) 100cm~Group 2: AL 100cm and BPL 150cm~Weight loss will be evaluated 1 year after surgery