While weight loss surgery can help you lose weight, there are several steps you have to take before the surgery can happen. To begin with, you need to prove your dedication and enthusiasm to losing weight by beginning a surgery diet, where you will need to demonstrate your ability to lose weight on a very low calorie diet before surgery. The surgery diet might consist of meal replacement shakes, or meals created at home using very low calorie ingredients. It is possible to try this surgery diet even if you do not plan on having weight loss surgery, as long as you want to lose weight quickly.