Fat transfer as part of a BBL is dynamic, meaning that the size of your butt will increase or decrease as you gain and lose weight. To maintain the size of the butt you had in the first few months after surgery, you need to maintain the weight you had at the time of surgery.Thus, your best bet is to gain weight and see how the butt responds. In some patients, this is all you need. In others, who want an even larger size, repeat BBL is needed.Hope this helps - all the best, Sam Jejurikar, MD
If you know you want/need to lose weight, you should do so prior to having surgery. Losing significant weight or fluctuating up/down after surgery can compromise your result and investment. The only way to remedy loss of volume in your buttocks would be to have another BBL.