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A: Exercise is good for the body in general, and toning the muscles can help fill out loose skin in the vicinity. By suppressing the appetite, and by slightly increasing the metabolism, exercise can assist weight loss. But, unfortunately, there is no such thing as a "spot" exercise, to make the body lose weight in a certain area. Troublesome areas, typically the chin, abdomen, hips or thighs, have a tendency to accumulate fat, and there is so far no way, exercise or pills, to force the body to selectively burn away that fat. To date, only liposuction can accomplish that.
A:

Liposuction is not a method of weight loss. Not only is it less effective for people who are obese, but also the results would be less than ideal, and there are increased risks for the significantly overweight person. The best candidates are those who have attained their ideal body weight, and yet still have one or more difficult areas which do not respond to further weight loss or exercise.

Because fat is lighter than water, a large volume of fat does not account for as much weight as one might think. For example, say a person has 2 liters of fat removed (picture the volume of two one-liter bottles of soda) from the abdomen or the thighs. Clearly, that would make a significant difference in contour and in measurements, yet the weight removed is less than five pounds.

A: There is nothing mystical or special about "cellulite", it is just fat, but it is fat located just under the skin, making a rippled look that is quite apparent. Liposuction removes some of this cellulite fat also, but it is difficult to eliminate entirely. Weight loss by dieting is the best way.
A: Liposuction removes fat, and so also removes some of the weight which may be pulling the skin downwards. In this way, liposuction will sometimes permit the skin to tighten a little, but liposuction does not accomplish very much skin tightening on its own. In fact, sometimes, removal of the underlying fat can even make loose skin more apparent. If loose skin is already a problem, liposuction may not be the best solution for the person.
A:

Fat cannot come back unless one gains weight again, in which case all body areas will share in the weight gain. However, after liposuction, the treated areas have a permanently decreased capacity for additional fat, because so many of the fat cells have simply been removed. But there are still fat cells present, so some gain in that area is to be expected with weight gain.

For that reason, someone gaining weight after liposuction is more likely to notice the increased fat being deposited in other areas that had not been liposuctioned. That is the reason for the incorrect speculation that after liposuction, "some other area will just get fat". Only if one gains weight would an increase occur.