I have been doing Brazilian Butt Lifts (BBL) or fat transfer to the buttocks for over 15 years. I do more than 150 of them every year, so I have learned a few things that may help you if it is a procedure you are considering. I will start by saying that the great majority of my patients are very happy with the results, and that every single one has an improvement in the size and shape of the buttocks.
I am confident that the surgery works. Technique of fat removal, the cannulas used to both remove and inject the fat and how you treat the fat are all important. Without getting technical, the less you do to the fat cells, and the quicker they are replaced in the body, the better the results in my hands.
How you take care of yourself for the first few weeks, including sleeping position and the avoidance of sitting, are major factors in fat survival. If any doctor tells you you can do a BBL with a Tummy Tuck or Breast or Face procedure, do not do the operation. Sitting or lying on your back, even if you use a donut pillow, will not give the best results. You can do other surgery, as long as you can lie on your stomach after.
Laser or Ultrasound liposuction fat should not be used in fat transfer. This fat is damaged and unsuitable for transfer. Make sure tumescent technique is used for removal of the fat.
There are some areas in certain patients where fat will not survive as well. Even if the surgeon does everything right, fat can disappear or take more on one side versus the other. Also, there is a limit to the amount of fat that will survive, which is determined by the circulation and oxygen availability of the area being treated.
People who do not have enough fat for transfer will not get a good result with temporary weight gain to have more fat. When you lose weight, you lose fat. They are also poor candidates for buttock implants, which I do not feel are good for virtually anyone.
Choose your BBL surgeon carefully. Go to www.plasticsurgery.org to make sure they are a Board Certified Plastic Surgeon, and ask how many they do a year, and see lots of before and after pictures. You are in charge, so be selective.