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It's a question I have to answer in nearly every liposuction consultation - After liposuction, does the fat come back in other areas?
The answer is no.
Once fat cells are suctioned from an area of your body with liposuction, they are permanently removed. However, there will be fat cells remaining, as it would look quite odd to have skin stuck directly to your muscle without some layer of fat.
What happens to your body after liposuction is quite simple. If you eat more calories than you expend, you will gain weight. The remaining fat cells will expand. You will gain weight as you normally do in ALL areas of your body, with the exception that in the areas of liposuction, the weight gain will be less than it would have been without liposuction.
Liposuction is both an emotional and financial investment. If you don't think you can maintain the results long term by adjusting your attitude towards diet and exercise, it may not be worth doing.