You should lose all the weight you can prior to your face and neck lift surgery as it will result in an improved lift of your sagging face and neck lift. This is because the lighter your face and neck skin and soft tissue are, the easier it is to lift them. This is purely from a physics standpoint; the lighter something is, the easier to hoist it up! In addition, Dr. Laguna does not want you to alter your weight. He considers your face and body almost like it is a canvas. You should make sure that you keep your canvas steady so that the changes you undergo are constant and do not change with time. This means losing all the weight you wish to prior to surgery.