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The Weight You Keep Is the BBL You Keep: What I Tell Patients on RealSelf

Black and white photograph of a woman in a fitted dark dress standing in profile against a plain studio backdrop, one hand on her hip, hard side light on the line of her hips. Illustrative generated image, not a real person, not a patient photograph and not a result. Commentary by Frank Agullo, MD, FACS.

“Do I need to gain weight for a BBL?”

That is probably the question I get most on RealSelf, and I have been getting it since 2017. The only difference is that back then it came with a photo and a height and weight. Now it comes with a GLP-1 prescription and a plan to lose the weight afterward.

The long answer starts with the fact that grafted fat is living tissue. It grows and shrinks like any other fat in your body. Weight gain or loss does the same thing to the fat I moved to your buttock as it does to the flanks I took it from. So every candidacy question is a weight question, and the key to a result that lasts is staying close to the weight you had on the day of surgery.

Five of those questions, paraphrased and stripped of identifiers, with my answers lightly edited for publication.

“Do I need to gain weight for a BBL?”

Answered on RealSelf, Jun 2017.

From your photos it seems that you would be a good candidate for a Brazilian butt lift. I would recommend taking fat from all possible areas including abdomen, lower back, upper back, and possibly medial thighs. I would be able to obtain more dramatic results with a 10 to 15 pound weight gain, but you would have to maintain the new weight after surgery. If you are looking for a more dramatic result, you might want to consider the use of buttock implants as well.

“Should I lose weight first? I am 150 now and used to be 115 to 120.”

Answered on RealSelf, Nov 2023.

When it comes to procedures like a BBL with lipo 360, weight plays a big role in deciding the right time to have surgery. At 150 pounds your BMI is 26.5, which technically puts you in the overweight category, but just barely.

If you are unsure what weight you should be at before the procedure, think about the weight you are most comfortable at and most likely to maintain after surgery. If 150 pounds is a weight you are happy with and can keep after your BBL and lipo 360, then this is a good weight to have the surgery at (knowing that you will probably lose about 5 pounds from the fat removed). On the other hand, if you feel you will likely return to your earlier weight after the procedure, it is best to wait until you are closer to that weight. Big weight changes after a BBL or lipo 360 can alter your results, so having the procedure close to the weight you will keep gives you the most stable, longest-lasting result.

“Does going over the muscle limit the fat, and how much survives?”

Answered on RealSelf, Nov 2023.

Where is the best place to put the fat in a Brazilian butt lift, into the muscle or over it? There has been real concern about putting fat into the muscle because of fat embolism (fat getting into blood vessels and traveling to the lungs), so the guidelines now recommend placing fat over the muscle. Some surgeons think the result may be better with fat placed into the muscle (more lift, a better scaffold for the graft), but for safety I recommend grafting over the muscle.

Will you still get a good result without fat in the muscle? Yes. There is a finite amount of space over the muscle, but a large Brazilian butt lift can still be achieved in experienced hands. Depending on the study, fat survival over the muscle runs 50 to 70 percent, and the rest is reabsorbed by the body. So depending on the amount and quality of fat available, the technique used and the post-operative care, your goal of wider hips and a larger buttock can be reached.

Three years on, I would put it more bluntly. I graft above the muscle only, with an ultrasound probe on the skin so I can see the cannula the whole time. There is no version of “into the muscle” that I do. If a surgeon tells you more fat survives in the muscle, ask what else travels there.

“Is 500 cc per side enough?”

Answered on RealSelf, Oct 2018.

The amount of fat to be injected into the buttocks and hips is determined by your current body composition and your objectives. With 500 mL, you will definitely improve the projection and contour. Most of my patients have 1,000 mL or more during their BBL. Keep in mind 30 percent of the volume will go away during the first four to six weeks.

“Is it okay to lose 15 to 20 pounds after a BBL?”

Answered on RealSelf, Jun 2017.

It is okay to lose weight after a BBL. Keep in mind that after a Brazilian butt lift your new shape is locked in. With weight loss your buttock is likely to get smaller but would maintain the same curves.

The 2026 version of that question came with a weight loss injection attached:

Your grafted fat in the buttocks is still living fat, so if you shed pounds, your buttock fat will shrink right along with it. Ten pounds is actually a minor amount, and a gradual, slow rate of loss is more forgiving to your BBL’s overall aesthetic compared to rapid or crash weight loss. You will probably notice a slight decrease in your buttock’s prominence.

What I Would Say to All of Them

I am in the business of building shape. You are in the business of keeping size.

If you think you are too thin for a BBL, chances are I can still snatch the waist, fill the hip dips and round out a flat buttock, and I can do it safely as long as your BMI sits under 35. What I cannot do is make the graft ignore your metabolism. Gain 20 pounds for the surgery and lose them after, and the extra fat I harvested deflates with you. Take a GLP-1 a year later and lose 30, and the curves stay while the volume follows the scale, which is the whole subject of my 360 deflation post.

The full set of six questions, with the BMI cutoffs and the thin-patient graft numbers, is on my surgical site. The practice’s version is on Southwest Plastic Surgery. Where my 35 comes from is in the BMI post, and the science of why half the fat stays and half does not is in BBL fat survival.

I am a double board-certified plastic surgeon, a Mayo Clinic fellowship alum, a Clinical Associate Professor of Plastic Surgery at Texas Tech University Health Sciences Center, and a founding vice president and president of the World Association of Gluteal Surgeons. The weight question is the one I ask first because it is the one that decides what you keep.

Call the office at (915) 590-7900, text us at 1-866-814-0038, or book a consultation at agulloplasticsurgery.com/appointments. My answers are on RealSelf.

#StayBeautiful

@RealDrWorldWide on Instagram, TikTok, and Snapchat, @Agullo on X, or @AgulloPlasticSurgery on Facebook.

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Where the Fat Goes: The Science of BBL Survival, From My OR

Moody greyscale photograph of a woman resting face down on a recovery lounge in a surgical compression garment. BBL fat survival science explained by Frank Agullo, MD, FACS, Dr. WorldWide.

Every BBL I consult ends the same way: “So, how much of that fat stays long-term?”

Patients arrive from the internet convinced the fat basically just melts away. Colleagues outside the field ask because they suspect the results will not last. Both parties have a mistaken perception of what the surgery does, so here is the answer I would give across the conference table: the biology.

The Number, and Why It Is a Range

Fifty percent to eighty percent. So the difference is a 30% span? Yeah, that is kind of the magic. But that difference is not random; there is really little random variance from one patient to another.

A fat graft is living tissue that comes from the recipient. I took fat tissue that had its blood source detached, squeezed it through a syringe-like tool called a cannula and then put it in a place where it can only rely on diffusion to get to nutrients for the first 2 weeks until it is able to build a blood supply. The tissue that successfully reattaches will last for the next few decades. In contrast, the tissue that did not attach will simply be absorbed into your body, resulting in volume loss.

It is much more than just moving tissue. Every decision the surgeon makes is focused on making sure those cells can live on for two weeks.

The Wash Most Patients Never Hear About

Surgeons often want to see my fat-washing protocol more than any other piece of my entire fat-grafting procedure. And before all that nice soft fat goes back to the patient, I am washing that fat thoroughly with AuraClens, a solution that contains Poloxamer 188.

What is the best way? First is housekeeping. When you get lipoaspirate harvested from patients, it is not clean: it includes tumescent solution, free oil due to burst adipocytes, as well as dead adipocytes. This process removes the sludge to deliver a concentrated product of viable cells. Each cc injected contains the maximal amount of living fat possible. Now you double pay when you inject nonviable debris. That mass will disappear as the cellular detritus dissolves, and this trash creates a massive amount of inflammation among the living adipocytes attempting to survive.

The second benefit is the one worthy of a journal club. Poloxamer 188 is a membrane-active surfactant; it does more than simply scrub/clean the membrane. What makes it so unique is how it actually works to repair and stabilize the adipocyte membrane, essentially patching up damaged holes in cell walls and making them resist apoptosis, the programmed self-destruction that stressed adipocytes would carry out, whereas the ones scheduled for elimination instead just keep kicking along.

The Patient’s Half of the Equation

I can scrub and prep the fat perfectly and still lose the graft to a barstool. Pressure destroys grafts in the first two weeks, which is why my sitting protocol is non-negotiable. For two weeks: nothing hard under the buttock, a BBL cushion shifting the weight onto the thighs for any sitting, and stomach sleeping, or a wedge-supported beach chair position for anyone who cannot manage the stomach.

The other patient-side lever is the massage table. Lymphatic drainage two, preferably three times a week for the entire first month, and honestly as often as the schedule allows: it works scar tissue and fluid out of the donor sites. My patients run theirs through the post-surgical massage program at Southwest Plastic Surgery. It is an unsexy part of the operation and the one that makes the most substantial difference in the final contour.

The payback comes fast. Final volume is essentially there at week four, when every restriction lifts, and the settled result is declared at three to six months. Out-of-town patients, most of my practice, fly home on day five.

What I Tell Colleagues About the Long Game

If the fat makes it through its first month, it is no longer vulnerable. It is permanently on the payroll and it behaves like fat behaves. Weight loss will cause it to shrink; weight gain will cause it to expand. The ruined results I occasionally witness are almost never a result of the surgery itself. They are yo-yo cycles, losing and regaining weight, which stretch out the skin, sag the mound I painstakingly created, and leave contour issues that no revision entirely fixes.

For all my fellow plastic surgeons: We choose our patients not only for their anatomy but also for their understanding of what it will take to maintain results. Before an op, tell those considering significant weight fluctuations that the size of their gluteal graft will inevitably follow their weight journey. The full patient-facing timeline, week by week, lives on my practice page for the Brazilian butt lift.

Where I Sit in This Field

The procedure itself started to really coalesce as an entity in the last 10 years, partially through my contribution, as I am a founding vice-president of the World Association of Gluteal Surgeons. Back then, all you heard about was the normal BBL; now you have the ultrasound-guided BBL and the supercharged BBL, which pairs fat grafting with intramuscular implants. That means you have a variety of approaches just as rhinoplasty now has different styles to choose from and all of them stem from the science behind the survival.

The Mayo Clinic taught me to treat every graft like the transplant it truly is. The liposuction that harvests it, the wash that protects it, and the two weeks that anchor it are one operation, not three separate events. Surgeons who treat them separately end up stuck at the fifty percent end of the range, wondering why.

Ready to Talk?

Whether you are a patient counting weeks or a colleague comparing protocols, my door is open.

Call (915) 590-7900, text 1-866-814-0038, or book online at agulloplasticsurgery.com/appointments.

@RealDrWorldWide on Instagram, TikTok, and Snapchat, @Agullo on X, or @AgulloPlasticSurgery on Facebook.

  • Week-by-week patient guide on agulloplasticsurgery.com: “BBL Recovery Week by Week: What Actually Happens After a Brazilian Butt Lift” (link once live)
  • Aftercare version on swplasticsurgery.com: “The Aftercare That Makes a BBL: Massages, Garments, and the Two-Week Rules” (link once live)