Why is there so much conflicting answers to weight gain before and after Brazilian butt lift?

why is there so much conflicting answers to weight gain before and after Brazilian butt lift? If you gain weight before surgery (have liposuction and transfer) why would you then need to lose weight if the fat is now 'in the right places'? Surely you can be encouraged to continue gaining weight to enhance the surgery since fat cells don't multiply only increase in size

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