Patients will be randomized into 2 groups:~Vit E group: Vitamin E acetate ointment will be applied over staple lines and anastomoses in Roux-en-Y gastric bypass.~Control group: Vitamin E will not be applied~Postoperative pain will be assessed 24 hours after surgery, by means of visuala analogic scale (ranging from 0 to 100mm).
Patients will be randomized into 2 groups:~Vit E group: Vitamin E ointment will be applied over staple lines and anastomoses~Control group: Vitamin E will not be applied~Postoperative pain will be assessed 24 hours after surgery.