Here is a Preparation for Surgery video for Nashville Weight Loss Solutions, created by Cyrano Video. This video discusses everything the audience should do leading up to your surgery. The gastric bypass is a bariatric and metabolic procedure that works in two ways: it creates a physical change in your body and a chemical change. The physical change reduces the amount of food you eat at one time and where the calories are absorbed during digestion. The chemical changes affect the signals in your body that control your blood sugar levels, whether you feel hungry or full and how your body processes food.