Fat freezing and inch loss, explained

Cryolipolysis and cavitation change shape, not weight. Who they suit, who they do not, and what the tape measure actually shows.

Fat freezing and ultrasound cavitation are contouring treatments, not weight-loss treatments. They reduce a specific pinchable pocket gradually, and they are measured in centimetres at the treated area rather than on the bathroom scale. They suit someone near a stable weight who dislikes a shape. They do very little for someone whose actual problem is overall weight.

Inch loss and weight loss are different measurements

A tape at a fixed point measures the circumference of one area. A scale measures all of you at once, including the several kilograms of water, food and waste moving through you on any given day.

Those two numbers move independently, and frequently do. Reduce a small volume of fat from a flank and the tape at that flank changes while the scale barely notices. Drink two litres of water and the scale changes while nothing about your body has. Anyone who has weighed themselves before and after a wedding weekend already understands this; the marketing in this category depends on you forgetting it at the point of sale.

Which is why the only honest way to run a contouring course is fixed-point tape measurements and comparison photographs at every visit, taken the same way each time — and a mid-course review that is permitted to conclude it is not working.

“A tape measure and a bathroom scale answer different questions. Selling one as the other is where most of the disappointment in this category comes from.”

What fat freezing actually does

Cryolipolysis works on a straightforward difference in vulnerability: fat cells are damaged by cold at temperatures that leave skin, nerves and blood vessels intact. An applicator draws a fold of tissue in and cools it in a controlled way. The injured fat cells are then cleared by the body across the following eight to twelve weeks, which is why nothing visible happens on the day, and why the review appointment sits months out rather than next week.

Three limits are worth understanding before anyone books it.

It only reaches the pinchable layer. The fat you can hold between finger and thumb sits under the skin and above the muscle, and that is the layer an applicator can draw in. Visceral fat — packed around the organs inside the abdominal wall, and the fat that matters most for health — is not reachable by any device applied to the outside. A firm, round abdomen you cannot pinch is a weight and health conversation, not a contouring one.

It does not tighten skin. Where the real complaint is laxity rather than volume, taking volume out from underneath can leave an area looking looser rather than better.

And it is partial. It reduces a pocket; it does not remove one. Some areas need a second sitting, and some people respond less than others for reasons nobody can predict in advance. Anyone quoting you a guaranteed result is quoting something the treatment does not produce.

What ultrasound cavitation does

Low-frequency ultrasound disrupts fat cells in the superficial layer, and the released contents are handled by ordinary metabolism. It is painless, has no recovery time, and is delivered as a measured course rather than a single sitting — often paired with radiofrequency where firmness is part of the complaint as well.

It is gentler and more gradual than fat freezing, which is exactly why it should be sold as a course with a review built into it rather than as a transformation. It adds no pigmentation risk in deeper skin tones, which matters here.

Choosing between the two is a clinical decision: the area, the thickness and quality of the fat, whether it can be drawn into an applicator at all, your skin, and what you are actually trying to change. It is not a decision to be made from a price list.

Who these treatments suit

Someone at or near a weight they are content with, whose complaint is shape rather than size — a lower-tummy pouch that survived the weight loss, flanks that sit over a waistband, a bra-line fold, inner thighs, upper arms.

Someone with a discrete, pinchable pocket rather than a general covering.

Someone who understands the timescale, is willing to be measured honestly at every visit, and would rather be told at the mid-course review that this is not earning its place than be sold the rest of the course regardless.

Who they do not

Anyone whose real goal is weight loss. This is the important one, and it is the one most often ignored at the point of sale. If the number you want to change is on the scale, these are the wrong treatments, and the assessment should say so before you pay for anything.

Anyone whose measurements point to visceral fat rather than a subcutaneous pocket — which is one of the reasons a body composition analysis belongs before a contouring course rather than after one.

Anyone pregnant or breastfeeding. Anyone with active infection, inflammation or broken skin over the area, or a hernia in the treatment area. For fat freezing specifically, the cold-related blood disorders — cryoglobulinaemia, cold agglutinin disease and paroxysmal cold haemoglobinuria — rule it out, and a history of marked cold sensitivity such as Raynaud’s phenomenon needs raising before anything is booked. Where radiofrequency forms part of the treatment, an implanted electronic device such as a pacemaker changes the plan.

And anyone whose complaint is loose skin, stretch marks or a scar. Those are different problems with different answers.

Honest expectations

Change is gradual and partial. Weeks across a cavitation course; eight to twelve weeks after fat freezing. It is judged on tape measurements and comparison photographs rather than on how you feel about a mirror on a particular morning.

After fat freezing, temporary numbness, redness, swelling and tenderness in the treated area are ordinary and settle. There is also an uncommon but recognised complication in which the treated area enlarges over the following months instead of reducing. It does not resolve on its own. It is uncommon — but any clinic offering the treatment should tell you it exists before you book, and if nobody mentioned it, that tells you something about the consent you were given.

Neither treatment is liposuction, and neither is a substitute for it. Surgery removes considerably more in one sitting and carries the risks of surgery; these remove considerably less, gradually, and without either.

And the result is not sealed. The fat cells that remain are perfectly capable of enlarging again, so if weight goes up afterwards the contour goes with it. Nothing in this category is permanent, and a clinic describing it that way is describing something the biology does not support.

What to ask before you book

Which of the two do you recommend for me, and why that one. How many sessions before we review, and what does the whole course cost rather than the first session. Will you measure me at fixed points and photograph me at every visit. What happens at the mid-course review if the measurements have not moved. Who assesses me, and is that the same person operating the device.

The treatment pages set out what each one is for: cryolipolysis for fat freezing, ultrasound cavitation and the inch loss programme for the measured course, and body contouring where more than one area or modality is in play. If the honest answer at assessment turns out to be that your concern is weight rather than shape, that pathway is medical weight loss — and being told so before you pay for a course is the entire point of having an assessment first.

Reviewed by the Kremlin Aesthetics clinical team. Last updated 19 August 2026.