The main aim of this study is to evaluate the effect of early oral nutrition on decreasing the complications and hospitalization duration following laparoscopic cholecystectomy surgery. The study is a single-centre, randomized interventional clinical trial in which, 100 patients who are candidate for laparoscopic cholecystectomy at Imam Khomeini hospital of Ardabil in 2016-17 are randomly allocated into two equal groups of intervention and control. Inclusion criteria are as follows: persons undergoing laparoscopic cholecystectomy, aged 15 years old or older, consent to the study, and no associated malnutrition. Exclusion criteria are as follows: Age less than 15 years, associated malnutrition, severe associated diseases, and emergent cases. The studied intervention is initiation of post-operative oral nutrition. The oral nutrition is initiated 1 hour after full recovery of patients from anesthesia in the intervention group and after 24 hours of surgery in the control group. The study outcomes are vomiting, nausea, hearing of bowel sound, flatus passing, stools passing, and duration of admission.