Let's say, for example, that you under-go liposuction treatment, yet you don't alter your post-op eating habits. What, over the course of time, do you think the end result is going to be?
Moreover, the over-whelming silence, in support of the idea, should also allow you to sense that your question has well and truly been answered.
Unless your life particularly depends upon it, interventive surgery is something that should only be considered as a last resort. Even then, your surgeon will still expect you to adopt a healthier diet before the surgery is under-taken, thus proving that pre-opp weight loss can be maintained after surgery.