Carbohydrates and Proteins 3h Before Surgery

Inclusion Criteria: * Adults (18-65 years-old), * of both sexes, and candidates to elective major operations such as subtotal gastrectomy, colectomy, and anterior resection of the rectum for malignancies Exclusion Criteria: * Diabetes mellitus, * chronic kidney failure, * chronic liver disease or serum bilirubin greater than 2 mg/dL, * body mass index (BMI) above 35Kg/m2, American Anesthesiologists Association (ASA) score above 3, * gastro-esophageal reflux, * gastroparesis or intestinal obstruction. * Patients with any non-compliance with the study protocol, or who had associated operations, or presented severe intraoperative complications (any type of shock, cardiac arrest, coagulations problems), or experienced prolonged