Will losing a small amount of weight shortly after a fat graft to the breast result in my grafts not taking well?

You should try to maintain your body weight for several months following any type of fat grafting procedure to ensure the best fat cell survival. Consult your plastic surgeon if you have any specific questions about your case. Best wishes,Dr.Bruno

Everyone gains and loses weight in different places. If you lose weight in your breasts, I don't recommend intentionally losing weight, as you will lose volume in your breasts.   I also recommend an in-office examination as well as a detailed discussion with a surgeon who you are comfortable with.   Finally, make sure your surgeon is a Double-Board Certified Plastic Surgeon certified by the American Board of Plastic Surgery (ABPS), a member of the American Society of Plastic Surgery (ASPS), a member of the American Society of Aesthetic Plastic Surgery (ASAPS), and a fellow of the American College of Surgeons (FACS).Best,Dr. DesaiBeverly Hills Institute for Aesthetic Plastic SurgeryHarvard Educated, Beverly Hills & Miami Beach TrainedDouble Board-Certified, Double Fellowship-Trained Beverly Hills Plastic Surgeon

hello thank you for your question and provided information as well.. based in your question its difficult to evaluate you if the case dont have a case.its recommend get a consultation in person with a plastic surgeon to evaluate you.

Dear Amy870,Fat viability depends a lot of surgeon technique. The fat has to be placed back into the buttocks as soon as possible so that it has a greater chance of survival. It has to be placed carefully so that not too much fat is placed in only one area. Insignificant weight loss should have no major negative effect on your final results. Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Weight loss may make the surviving grafts diminish a bit but the main reason that fat transfers diminish after surgery is that most of the cells are dead at the time of transplantation.  The dead cells will not 'revive', although some of the fatty oils in the cells can coalesce and form fatty cysts, which technically give volume but are not alive.  

While there is no absolute number (lbs.) in terms of weight for undergoing liposuction with autologous fat transfer, the optimal candidate has reached a healthy and stable weight (preferably with a BMI less than 30, which is associated with a lower incidence of complications).

Potential candidates should also have adequate fat reserves for transfer. This becomes especially important when one considers the anticipated rate of fat resorption and graft loss. I typically recommened patients aim for at least 500 cc transferred per cheek. This would amount to 1 liter of fat (not lipoaspirate) after processing. Candidates with inadequate fat reserves are likely to be disappointed with their ultimate volume once healing is complete. 
If you have reached a healthy stable weight (preferably with a BMI less than 30), the focus should be on maintaining. I typically do not recommend gaining/losing weight for the sake of surgery alone (weight loss for the sake of your health is a different story). It is important to remember that weight changes post procedure can potentially compromise the results of your buttock augmentation (as transferred fat can change with weight just as it could prior). If you plan on losing weight, I would do so before surgery and plan on maintaining afterwards.With regards to your specific question, weight loss which results in a return to your pre-op baseline should not compromise your grafts. However, fat redistribution with weight changes is always difficult to predict. Thus the focus should always be on maintaining.
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

Once fat is grafted into a new area, it becomes part of your body. If you lose weight, that area will shrink accordingly. If you gain weight, that area will grow as well. The fat cells do not disappear or "fail to take" because you have lost weight. Rather, the cells shrink but are still there. Hope this helps!
Johnson C. Lee, MD
Board-Certified Plastic Surgeon
IG: @drjohnsonlee

This is a good question and not a good answer.  We really don't know enough about fat grafts to the breast and how they behave, yet.  Go ahead and lose your weight and let us know what happens.Good Luck!