Is It True That After a Yr the BBL Results Start to Fade?

Hello dear!!
Thanks for the question and provided information as well. 
After a BBL, only about 70% of the transferred fat cells will survive, so it is normal to see a minor reduction in your buttocks, but then results should be permanent, as long as you maintain a stable, healthy weight. If you have any concerns, I suggest you to follow up close with your plastic surgeon.
Good luck :)

Fat grafting to the buttock region can be very successful if done judiciously and with gentleness in order to allow the transplanted fat to survive. Though it is hard to quantify exactly how much of the transplanted fat survives, it has been my experience that early volume loss (in the first 4-6 ) weeks, represents the time frame that I expect most of the volume changes to occur. Beyond that, small, subtle changes can occur, but are not as noticeable. I believe that over the next several years, continued improvement in the method of harvesting and transplantation will occur allowing for greater success in graft survival.