If you are planning to schedule bariatric surgery, you should be prepared for the radical dietary changes you will be required to make. Your doctor will probably put you on a special diet before your surgery is scheduled. The special diet before your surgery can help you adjust to healthy eating habits and can help strengthen your body for surgery. Eating the appropriate foods before and after bariatric surgery can help you see your desired weight loss results. If you do not follow your doctor's dietary guidelines, your progress will be slow, and you might even experience serious medical complications.