Study aim: To determine the effect of preoperative oral carbohydrate solution on postoperative blood glucose levels in patients undergoing major gynecological surgery Design: Randomized, double blind, placebo controlled, parallel group clinical trial on 60 patients; randomization was performed using a random number table Settings and conduct: This single center study is conducted at Shahid Sadoughi Hospital in Yazd. After obtaining informed consent, patients are randomly assigned to two groups. Both patients and outcome assessors are blinded to group allocation. Participants/Inclusion and exclusion criteria: Inclusion criteria: Women aged 16 to 60 years undergoing major gynecological surgery; American Society of Anesthesiologists physical status class II. Exclusion criteria: American Society of Anesthesiologists class III or higher; history of type 1 or type 2 diabetes mellitus; recent hospitalization within the past two months with dextrose infusion; inability to tolerate oral intake. Intervention groups: Intervention group: Receiving 100 ml of 50% oral dextrose solution two hours prior to surgery. Control group: Receiving 100 ml of plain oral water as placebo two hours prior to surgery. Main outcome variables: Blood glucose level