I refer you to the link below to get more info on how important proper technique is for harvesting of fat grafts and what the necessary steps are. Although a properly performed fat graft does not need maintenance, the VOLUME of the fat graft will change according to significant fluctuations in your body weight. For example, if you had fat grafts to the buttocks, and you gain a lot of weight, the fat grafts in the buttocks will also get larger. If you lose weight, the fat grafts will diminish in volume, but NOT disappear. When you gain weight again, their volume will return. I have done hundreds of fat graft procedures, proper technique is crucial, and after reading the info in the link provided below, quizz your provider about he plans to do the procedure. Remember to ask what your chances are of a redo. A surgeon who is proficient with the technique should be confident he won't need a redo.