Gaining weight for BBL? (Photos)

Hi why do some dr ask to patients to gain weight for a bbl? Is it not correct that by gaining weight only your fatcells grow and that you not have more fatcells? Do dr ask to gain weight so that your booty already grows by you gaining weight and than by liposuction bum is not touched do automatically you will have a bigger butt because u gzined nt because they took out more fat to put in ur booty? Please clarify

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