Medical illustration of cryolipolysis showing cooled fat cells alongside clinical research graphs and ultrasound images measuring fat reduction.

Is Fat Freezing Clinically Proven? What the Research Really Says About Cryolipolysis

Fat freezing promises something many people find appealing: a way to reduce stubborn pockets of fat without surgery, needles or significant downtime. But behind the impressive before-and-after photographs and claims of up to 25% fat reduction, what does the science actually tell us? Does fat freezing really work? Are the results permanent? And how do you know whether the technology being used is supported by credible clinical evidence? Having worked with cryolipolysis, the medical term for fat freezing, since 2010, I have seen first-hand how the technology has evolved, from my early experience with CoolSculpting to the newer-generation systems available today. At Dr Preema London Clinic in Mayfair, London, we now use Cristal Pro, developed by French medical technology manufacturer Deleo. My approach, however, has remained consistent: looking beyond the marketing claims to understand what the clinical evidence really tells us, what results patients can realistically expect and, most importantly, whether the treatment is right for them.

How Does Fat Freezing Actually Work?

The science behind fat freezing is surprisingly straightforward.

Fat cells are more sensitive to cold than many surrounding tissues. Cryolipolysis uses carefully controlled cooling to target these cells beneath the skin, triggering a process that causes some of them to die.

Over the following weeks and months, the body’s immune system gradually clears the affected cells. As a result, the treated fat layer may become thinner, creating a smoother, more defined contour.

Think of the stubborn pocket of fat around the lower abdomen that persists despite a healthy lifestyle. Fat freezing is designed to target precisely this type of localised concern.

It is important to understand, however, that fat freezing is a body contouring treatment, not a weight-loss solution. The aim is to refine shape rather than significantly change the number on the scales.

The US Food and Drug Administration (FDA) provides useful guidance on cryolipolysis, explaining both the science and the potential limitations of non-invasive fat reduction.

Source: FDA – Non-Invasive Body Contouring Technologies

Can Fat Freezing Really Reduce Fat by 20–25%?

This is probably one of the most interesting claims surrounding fat freezing, because the percentage sounds impressive but is rarely explained.

Clinical research does support measurable reductions in localised fat thickness following cryolipolysis. A systematic review published in 2025, examining 30 studies involving 3,158 participants, found reductions in abdominal circumference and fat thickness following treatment, although outcomes varied.

One investigation particularly relevant to our clinic examined the original Cristal cryolipolysis system, developed by Deleo.

The 2017 study involved 20 participants and reported an average reduction of approximately 24% in the treated fat layer after two months.

But what does that actually look like?

Cryolipolysis infographic illustrating a 24% reduction in measured fat thickness, from 30 mm before treatment to 22.8 mm after treatment.

Putting a 24% Reduction Into Perspective

Imagine the fat layer in a particular area measures 30mm before treatment.

A 24% reduction would bring that measurement down to approximately 22.8mm, a difference of just over 7mm.

That may not sound dramatic, but when treating a defined pocket of fat, even a relatively small change in thickness can make a noticeable difference to the body’s silhouette.

The important distinction is that this percentage relates to the treated fat layer. It does not mean losing 24% of your body fat or body weight.

There is also a qualification worth understanding. The Cristal investigation was small, manufacturer-sponsored and involved an earlier generation of the technology. It provides encouraging evidence, but its results should not be presented as a guaranteed outcome for every patient or every device.

For me, this is where clinical research becomes genuinely useful: not as a promise, but as a way of setting informed, realistic expectations.

Sources: DELEO – Cristal Clinical Investigation (2017) | Systematic Review of Cryolipolysis Outcomes (2025)

Cristal Pro fat freezing device screen and applicators at Dr Preema London Clinic for non surgical body contouring

Why We Now Use Cristal Pro

Having worked with fat-freezing technology since 2010, including CoolSculpting, I have been able to follow its development over many years.

Our current system, Cristal Pro, represents a newer generation of cryolipolysis technology.

One of its practical advantages is the ability to treat up to four areas simultaneously, using different applicators designed for different body shapes and fat deposits.

This allows us to plan treatments around the individual rather than taking a one-size-fits-all approach.

Deleo has also continued its clinical research, including an observational study evaluating Cristal Pro in real-world treatment settings.

It is important to distinguish this ongoing research from the earlier Cristal findings. Although the devices share the same underlying cooling technology, results from one generation cannot automatically be assumed to apply to another.

And while patients frequently ask whether Cristal Pro is better than CoolSculpting, there is not enough robust, independent head-to-head evidence to conclude that either consistently produces superior fat reduction.

What matters is choosing an appropriate technology, understanding its limitations and ensuring that treatment is planned around the patient’s anatomy and goals.

Source: Deleo – Clinical Studies

What Does Fat Freezing Feel Like, and When Will You See Results?

One of the attractions of cryolipolysis is that it does not require surgery or a lengthy recovery period. During treatment, the applicator is positioned over the targeted fat deposit. Depending on the applicator, patients may initially experience suction, pressure and intense cold, followed by numbness as the area cools. Some people find the initial sensation unusual, but discomfort often settles as treatment progresses. Results are not immediate. The body needs time to process the affected fat cells, with changes generally developing over approximately eight to twelve weeks. This gradual progression is worth remembering when looking at before-and-after photographs. The result is not created during the treatment itself; it develops as the body responds over time. Some patients may benefit from additional sessions, depending on their starting point and the result they hope to achieve.

Is Fat Freezing Safe? Understanding the Risks

Fat freezing is non-surgical, but that does not make it entirely risk-free.

Common temporary effects include redness, swelling, bruising, tenderness and altered sensation in the treated area.

There are also less common complications, including cold-related skin injury and prolonged numbness.

One complication that deserves particular attention is paradoxical adipose hyperplasia (PAH), where the treated fat tissue increases in size rather than decreasing.

A systematic review published in 2025, involving more than 13,000 patients, estimated a pooled PAH incidence of approximately 0.22%, although the researchers highlighted limitations in the available evidence.

PAH is uncommon, but it can be persistent and may require surgical correction.

This is precisely why I believe non-surgical treatments should still be approached with medical care and proper patient assessment.

Suitability matters. Certain cold-sensitivity conditions, poor circulation and other medical factors may make cryolipolysis inappropriate.

Patients should understand both the expected benefits and the possible complications before proceeding.

Sources: FDA – Cryolipolysis Risks | PAH Systematic Review and Meta-Analysis (2025)

Who Is Fat Freezing Best Suited To?

The patients who tend to be most suitable for fat freezing are those who are close to their preferred weight but have specific, pinchable areas of fat they would like to reduce.

Common concerns include the abdomen, flanks, thighs, upper arms and areas around the knees.

However, not every concern about body shape is caused by excess fat.

Sometimes what appears to be a stubborn bulge is influenced by skin laxity, reduced muscle tone or a combination of factors.

This distinction is important because removing fat will not necessarily improve loose skin, cellulite or muscle definition. In some cases, reducing underlying volume could even make existing laxity more noticeable.

At Dr Preema London Clinic, our approach is to assess what is actually contributing to the concern before recommending a treatment.

For some patients, that may be Cristal Pro. For others, a different approach involving muscle stimulation, skin tightening or improvements in skin quality may be more appropriate.

The objective is not simply to reduce fat, but to achieve a result that looks balanced and natural.

Are Fat-Freezing Results Permanent?

The fat cells successfully destroyed through cryolipolysis are gradually cleared by the body and are not expected to regenerate in the treated area.

However, this does not mean the body can no longer store fat there.

Remaining fat cells can still enlarge if weight increases, and natural changes in body composition will continue over time.

For this reason, fat freezing is best viewed as a way to refine body contours rather than a substitute for maintaining a stable weight and healthy lifestyle.

Dr Preema with two CoolSculpting machines for dual sculpting treatments in London

My Perspective After 16 Years of Fat-Freezing Technology

When I first began working with cryolipolysis in 2010, non-surgical fat reduction was still a relatively new concept.

Today, patients have access to a much broader range of body contouring technologies, supported by a growing body of clinical research.

That progress is encouraging, but it also makes it more important to distinguish meaningful evidence from persuasive marketing.

The research tells us that fat freezing can reduce localised fat deposits. What it cannot tell us is that every patient will achieve the same percentage reduction, or that one particular device will always deliver the best result.

After nearly three decades in medicine, my approach remains the same: understand the science, assess the individual and recommend treatment only when there is a reasonable expectation of benefit.

At Dr Preema London Clinic on Park Lane, Mayfair, our Cristal Pro consultations are designed to establish whether fat freezing is genuinely the right option for your body and your goals.

Because ultimately, the most important question is not simply whether fat freezing works.
It is whether it is likely to work for you.

Dr Preema Vig is the Medical Director and Founder of Dr Preema London Clinic in Mayfair, London. She has worked in medicine since 1997 and aesthetic medicine since 2003, with experience of cryolipolysis technology dating back to 2010.