A prospective randomized clinical trial of all the patients undergoing Roux - en-Y gastric bypass will be performed. Patients will be randomly assigned into 2 groups: those patients receiving a preoperative balanced energy high-protein formula (group 1) and those receiving preoperative Immunonutrition (group 2). Changes between groups in acute inflamatory markers (CRP, fibrinogen, leucocites), pain (VAS scale), postoperative septic complications .(anastomotic leak and organ/space SSI)and lenght of stay, among others will be investigated.
A prospective randomized clinical trial of all the patients undergoing Roux - en-Y gastric bypass will be performed. Patients will be randomly assigned into 2 groups: those patients receiving a preoperative balanced energy high-protein formula (group 1) and those receiving preoperative Immunonutrition (group 2). Changes between groups in acute inflamatory markers, pain, postoperative septic complications and lenght of stay, among others will be investigated.