Pre-operative Carbohydrate Drink to Preserve Peri-operative Insulin Sensitivity

Patients will ingest 400 ml of the simple carbohydrate drink consisting of commercial orange juice without pulp which contains 50 grams fructose/galactose 2 hours before surgery.

Patients will ingest 400 ml of the complex carbohydrate drink containing 50 grams of maltodextrin powder in water ( orange food color and artificial orange flavor have been added to the drink) 2 hours before surgery