Liposuction in the best of all possible worlds works best on people who are at or near their ideal weight since it improves contours of the body. Nonetheless I have seen liposuction help people who are visibly overweight as long as it serves as an incentive for weight loss. The person has to be honest with him/herself as to the reality of their determination to lose weight versus fooling themselves. Some people are able to successfully hold the surgery out as a carrot after they lose weight, and others undergo the procedure first no matter how small the improvement as an incentive to go on an exercise and diet program. Either way these approaches work for some people.