Does Fat Freezing Work? What CoolSculpting Actually Removes, the Side Effects, and Why We Don’t Offer It

Fat freezing is the most-searched non-surgical fat treatment in the UK, and the question people ask about it most is the simplest one: does it work? The answer from the research is yes, it does something measurable — and the size of that something, the time it takes, the number of cycles it needs and the rare way it goes wrong are all things the clinics selling it tend to leave out. Centre for Surgery is a private surgical hospital, and we chose not to offer cryolipolysis. This guide sets out the evidence for and against it, including the studies the industry cites and the ones it does not, so that you can decide for yourself. The wider comparison of every non-surgical body contouring treatment against liposuction is in our companion guide.

What Is Fat Freezing (Cryolipolysis)?

Cryolipolysis is the controlled cooling of a fold of skin and fat to a temperature that injures fat cells while leaving skin, nerves and blood vessels intact. Fat cells are more sensitive to cold than the tissue around them — the observation came from “popsicle panniculitis”, the dimples that appear in the cheeks of children who suck ice lollies — and in 2008 researchers at Harvard showed in a pig model that ten minutes of cooling produced a gradual loss of several millimetres of subcutaneous fat over the following months without damaging the skin (Manstein et al., 2008). CoolSculpting is the best-known device built on that work; several other machines do the same thing, and “fat freezing” now covers all of them.

How Does Fat Freezing Work?

A vacuum applicator draws a fold of tissue between two cooling plates and holds it at a few degrees below freezing for 35–60 minutes (flat applicators without suction exist for areas that do not fold). The cold crystallises the fat inside the cells and sets off a slow inflammatory reaction; over the following weeks immune cells digest the damaged fat cells and the debris is carried away. Nothing is suctioned, nothing leaves the body on the day, and the layer thins gradually — the earliest change appears at about four weeks and the final result at 8–12 weeks. The area is massaged firmly for a couple of minutes after the applicator comes off, which is uncomfortable and which the manufacturer’s own data suggests improves the result.

Does Fat Freezing Actually Work? What the Studies Show

Yes, and the size of the effect is consistent across the literature. A systematic review of 19 clinical studies found an average reduction in the treated fat layer of 14.7% to 28.5% measured by calipers and 10.3% to 25.5% measured by ultrasound, with no effect on blood fats or liver function and only mild, short-lived side effects (Ingargiola et al., 2015). An earlier review reported up to 25% reduction after a single treatment, visible improvement in 86% of patients and a satisfaction rate of 73% (Krueger et al., 2014). Those are the figures the “20–25%” claim on every clinic website comes from, and they are real.

What they describe is the thickness of a pinchable fold, and the fold is thin. A flank fold of 2.5 cm reduced by 20% is 2.0 cm: five millimetres removed. On a thick, well-defined pocket that is visible; on a slim person’s lower abdomen it is not. Two further caveats matter. Almost every study in both reviews was funded or supported by the device manufacturer, and a separate systematic review of 36 fat-reduction studies found that every method used to measure the change — tape, calipers, ultrasound, MRI and photographs — had significant limitations, with caliper and circumference readings the easiest to confound (Auh et al., 2018). A clinic’s own tape measurements are the weakest evidence on offer.

Fat Freezing Before and After: How to Read the Photos

We have no fat-freezing photographs to show you because we do not perform it, so what follows is how to read the ones you will find elsewhere. First, check the interval: a photograph taken before eight weeks shows swelling, not the result, and one taken after a course of three cycles is showing you three treatments, not one. Second, look at the whole frame — posture, breath, underwear line, lighting and tan all change a lower abdomen more than 5 mm of fat does, and a systematic review found photographic comparison to be one of the least reliable ways of measuring fat change (Auh et al., 2018). Third, look for the shape: a good result is a smooth, even thinning of the treated fold; an applicator-shaped dent, ridge or step between treated and untreated tissue is a known outcome and a reason to look elsewhere. The photographs in our own liposuction gallery are single-session results, and the guide to reading before-and-after photographs on that page applies equally to fat freezing.

Does Fat Freezing Work on Belly Fat?

On the belly fat you can pinch, yes, in proportion to the figures above. On the belly fat you cannot, no. A rounded, firm abdomen that does not fold when you pinch it is visceral fat — stored behind the muscle wall, around the organs — and no applicator, laser or injection reaches it; it responds to weight loss and nothing else. Our guide to visceral vs subcutaneous fat explains the difference and how to tell which you are carrying. A soft lower-belly pouch that pinches easily is subcutaneous and will respond; our guide to how to get rid of belly fat covers the diet and exercise side. After pregnancy, though, the pouch is often skin and a separated muscle wall rather than fat — our mum tum guide has the self-tests — and fat freezing does nothing for either of those.

How Many Sessions of Fat Freezing Do You Need?

Usually two or three cycles per area, spaced six to twelve weeks apart so that each result can be seen before the next is planned. An area is also often larger than one applicator: a lower abdomen may take two placements per session and a full abdomen and flanks four to six, each billed as a cycle. That arithmetic is why a “session” priced modestly becomes a course priced close to surgery, and why the honest comparison is the total cost of the course against the cost of removing the whole pocket once. A second cycle to the same area removes a similar percentage of what is left, not of the original — 20% of 2.0 cm is 4 mm — so returns diminish.

How Long Does Fat Freezing Last? Is It Permanent?

The fat cells that are destroyed do not come back; adult fat cells are not replaced in the treated area. But a course removes a minority of the cells in the fold, and the majority that remain grow and shrink with your weight exactly as before. Gain weight and the area enlarges again; the treated fold will simply be proportionally thinner than an untreated one would have been. The same rule governs liposuction — in a randomised trial, women who had small-volume liposuction and kept their lifestyle unchanged had regained their body fat percentage within a year, laid down elsewhere (Hernandez et al., 2011) — but liposuction has removed the whole pocket rather than a fifth of it, so there is far less left in the area to grow.

Fat Freezing Side Effects: What Are the Disadvantages?

The common side effects are minor and short-lived: redness, swelling, bruising, tenderness and numbness in the treated area for a few days to a few weeks, with numbness occasionally lasting longer. Around one patient in a thousand develops severe, deep pain beginning about two weeks after treatment that resolves on its own over several weeks (Krueger et al., 2014). Uneven results, an applicator-shaped contour and, rarely, a frost injury to the skin are also reported.

Paradoxical adipose hyperplasia (PAH)

The complication that matters is the one where the treatment does the opposite of what it is for. In paradoxical adipose hyperplasia the treated fat, after an initial reduction, thickens into a firm, painless, applicator-shaped block that appears two to six months after treatment and does not go away. The manufacturer quotes an incidence of 0.025% — one case per 4,000 cycles. A multicentre review of 8,658 cycles in 2,114 patients across eight Canadian clinics found incidence rates of 0.05% to 0.39% — up to one in 250 — with 55% of cases in men, most linked to older applicator models, and rates falling by more than three-quarters after the newer models were introduced (Nikolis and Enright, 2021). It is thought to be under-reported, its cause is not established, and it is not exclusive to cold: a case has been reported after non-contact radiofrequency treatment of the abdomen (Agochukwu-Nwubah and Mentz, 2019). The model Linda Evangelista’s account in 2021 of being left “permanently deformed” by PAH after cryolipolysis is the reason most people have heard of it.

PAH does not respond to further fat freezing, diet or exercise. The treatment is liposuction, and it is not always easy: the enlarged tissue is dense and fibrous, sometimes needs power-assisted liposuction or more than one procedure, and in some cases a tummy tuck to deal with what is left (Stein et al., 2024). That fibrosis is something our surgeons have met on the operating table: when revising the abdomen of a patient who had cryolipolysis years earlier, the fat layer was so firm and scarred that lifting the abdominal tissue was difficult — consistent with the thickening of the fibrous septa seen in the original animal work (Manstein et al., 2008). It is one of the reasons we would rather remove a pocket cleanly once.

Does Fat Freezing Hurt?

The first five to ten minutes are the worst: the suction pulls hard and the cold aches until the area goes numb, after which most people read or scroll for the rest of the cycle. The post-treatment massage is sharply uncomfortable for a minute or two. Afterwards the area feels bruised and numb for days to weeks. The late-onset deep pain described above affects a small minority and is the exception.

Who Should Not Have Fat Freezing?

Cryolipolysis is not suitable for anyone with cryoglobulinaemia, cold agglutinin disease or paroxysmal cold haemoglobinuria — rare conditions in which cold exposure damages the blood — or with cold urticaria, Raynaud’s disease, a hernia at or near the treatment site, poor sensation in the area, or during pregnancy. It is not a weight-loss treatment and is not appropriate above a BMI of about 30, where the fat is too thick and too widespread for an applicator to change the shape. Loose skin is a reason not to treat: freezing removes a little fat from under skin that has lost its elasticity and leaves the skin looser, which is why it is a poor choice after weight loss — our guide to loose skin vs fat explains the pinch test that tells the two apart.

How Much Does Fat Freezing Cost in the UK?

Fat freezing is priced per cycle, and clinics quote “from” figures for one small applicator. A realistic course for one area is two to three cycles, and a large area two to six applicator placements per session, so the first question to ask any clinic is the total for the course that will produce a visible result — not the price of a cycle. Set that total against the cost of a single session of liposuction of the same area, which removes the whole pocket; indicative figures for surgery are on our liposuction cost guide. Fat freezing is not available on the NHS.

Fat Freezing vs Liposuction

Why Centre for Surgery Does Not Offer Fat Freezing

Three reasons. The ideal fat-freezing patient — a small, defined, pinchable pocket in someone at a stable weight with good skin — is exactly the patient for whom one session of liposuction, often under local anaesthetic, removes the pocket completely; we could not see the case for selling that patient a course that removes a fifth of it. Our guide to alternatives to liposuction sets out where each option fits. The complication profile is inverted: fat freezing’s rare failure creates a surgical problem, whereas liposuction’s rare failures are surgical problems we already manage. And the fibrous change we have seen in previously frozen tissue makes later surgery harder for the patient who ends up needing it anyway.

What we do instead depends on the pinch test. For fat alone, liposuction — VASER for dense or fibrous fat, 360 liposuction for the whole waist — the operation behind most of the hourglass figure results people bring to consultation. For fat with mild skin laxity, BodyTite, which removes the fat and heats the underside of the skin through the same small incision so that it contracts; our guide to BodyTite vs liposuction explains when each applies. Where the skin over the fat is looser still, Argo Plasma is added after liposuction to contract it from beneath: the controlled version of the skin tightening that laser lipo promised and rarely delivered. For patients who want no surgery at all, TightSculpting is the one non-surgical treatment we offer, and we grade its evidence frankly in our non-surgical body contouring guide.

Liposuction and BodyTite Before and After Photos

All patients consented to their images being used for educational purposes; results vary with anatomy, skin quality and weight afterwards.

Frequently Asked Questions About Fat Freezing

Body Contouring at Centre for Surgery

Centre for Surgery is a CQC-regulated private hospital at 95–97 Baker Street, rated Good overall, offering liposuction, VASER, 360 liposuction, BodyTite and TightSculpting. Consultations are with a GMC-registered plastic surgeon, who examines the fat, the skin and the muscle wall before recommending anything, including no treatment. Surgery is performed under TIVA anaesthesia or local anaesthetic for small areas, the surgeon who assesses you operates, and we recommend a two-week cooling-off period after consultation. Your consultation is £100, redeemable against the cost of your procedure. Finance is available through Chrysalis Finance, subject to status; see our finance options page. Subject to status.

Phone: 020 7993 4849 | Email: contact@centreforsurgery.com | Address: 95–97 Baker Street, London W1U 6RN

References

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2. Ingargiola MJ, Motakef S, Chung MT, Vasconez HC, Sasaki GH. Cryolipolysis for fat reduction and body contouring: safety and efficacy of current treatment paradigms. Plast Reconstr Surg. 2015;135(6):1581–1590. doi:10.1097/PRS.0000000000001236. PMID 26017594.
3. Krueger N, Mai SV, Luebberding S, Sadick NS. Cryolipolysis for noninvasive body contouring: clinical efficacy and patient satisfaction. Clin Cosmet Investig Dermatol. 2014;7:201–205. doi:10.2147/CCID.S44371. PMID 25061326.
4. Auh SL, Iyengar S, Weil A, et al. Quantification of noninvasive fat reduction: a systematic review. Lasers Surg Med. 2018;50(2):96–110. doi:10.1002/lsm.22761. PMID 29210446.
5. Nikolis A, Enright KM. A multicenter evaluation of paradoxical adipose hyperplasia following cryolipolysis for fat reduction and body contouring: a review of 8658 cycles in 2114 patients. Aesthet Surg J. 2021;41(8):932–941. doi:10.1093/asj/sjaa310. PMID 33216910.
6. Stein MJ, Smith D, Chia C, Matarasso A. Paradoxical adipose hyperplasia following cryolipolysis. Aesthet Surg J. 2024;44(10):1063–1071. doi:10.1093/asj/sjae077. PMID 38573568.
7. Agochukwu-Nwubah N, Mentz H. Paradoxical adipose hyperplasia after noninvasive radiofrequency treatment: a novel report and review. J Cosmet Dermatol. 2019;19(4):866–868. doi:10.1111/jocd.13090. PMID 31376204.
8. Hernandez TL, Kittelson JM, Law CK, et al. Fat redistribution following suction lipectomy: defense of body fat and patterns of restoration. Obesity (Silver Spring). 2011;19(7):1388–1395. doi:10.1038/oby.2011.64. PMID 21475140.