Cryolipolysis — The Science Behind Fat Freezing

Last updated: 5 March 2026

What Is Cryolipolysis?

Cryolipolysis, commonly known as fat freezing, is a non-invasive body contouring treatment that uses controlled cooling to reduce stubborn fat deposits. The treatment exploits the fact that fat cells (adipocytes) are more susceptible to cold-induced damage than surrounding tissues such as skin, muscle, and nerves. Developed by scientists at Harvard University, the technology was inspired by observing popsicle panniculitis — a condition where children develop dimples after holding ice lollies against their cheeks.

At Axiom Aesthetics, we offer cryolipolysis as part of our non-surgical body contouring programme for patients seeking targeted fat reduction without surgery, anaesthesia, or significant downtime.

The Science of Fat Freezing

The scientific principle behind cryolipolysis relies on selective cryolysis — the targeted destruction of fat cells through precisely controlled cooling:

• Temperature range — Fat cells begin to crystallise and undergo apoptosis (programmed cell death) at temperatures between -11°C and +5°C
• Selective targeting — At these temperatures, fat cells are damaged while surrounding skin, muscle, nerve, and connective tissues remain unharmed
• Apoptotic process — Unlike necrosis (traumatic cell death), apoptosis triggers a gradual inflammatory response that safely processes and eliminates the damaged fat cells
• Natural elimination — Over the following weeks and months, the bodys lymphatic system progressively clears the damaged fat cells through normal metabolic pathways

What Happens at the Cellular Level

When fat cells are exposed to the controlled cooling of cryolipolysis, a cascade of biological events occurs:

1. Crystallisation (during treatment) — Lipids within the adipocytes begin to form intracellular crystals
2. Inflammatory response (days 1-3) — An acute inflammatory infiltrate surrounds the affected fat cells
3. Apoptosis initiation (days 3-7) — Damaged fat cells begin the programmed cell death process
4. Phagocytosis (weeks 2-8) — Macrophages engulf and digest the dead and dying fat cells
5. Lipid processing (weeks 4-12) — Liberated lipids are processed through the liver via normal metabolic pathways
6. Volume reduction (weeks 8-16) — Visible reduction in the treated fat layer becomes apparent

What to Expect During Treatment

A typical cryolipolysis session follows these steps:

1. Assessment — Your practitioner examines the treatment area, assesses the fat deposit, and determines suitability. Photographs and measurements are taken
2. Applicator placement — A gel pad is applied to protect the skin, and the treatment applicator is positioned over the target area
3. Vacuum and cooling — The device draws the tissue into the applicator cup using gentle vacuum suction, then begins the controlled cooling cycle
4. Treatment duration — Each cycle typically lasts 35-60 minutes per area, depending on the device and applicator used
5. Removal and massage — After the cycle, the applicator is removed and the treated area is vigorously massaged for 2-3 minutes. This manual massage has been shown to improve results by up to 68%

Treatment Sensations

Patients typically report the following sensations during treatment:

• Initial pulling and pressure from the vacuum suction
• Intense cold sensation for the first 5-10 minutes, which subsides as the area numbs
• Most patients read, work on laptops, or watch content during the treatment once numbness sets in
• Brief discomfort during the post-treatment massage as sensation returns to the area

Treatable Areas

Cryolipolysis can be applied to various body areas with different applicator shapes and sizes:

• Abdomen — the most commonly treated area, addressing both upper and lower abdominal fat
• Flanks (love handles) — highly effective due to the pinchable nature of lateral fat deposits
• Inner and outer thighs — reducing saddlebags and inner thigh fullness
• Upper arms — targeting bingo wings or upper arm fullness
• Submental area (double chin) — using a smaller applicator specifically designed for this area
• Bra fat and back fat — lateral chest and upper back fat rolls
• Banana roll — the crescent-shaped fat deposit below the buttocks

Results and Expectations

Setting realistic expectations is essential for patient satisfaction:

• Average fat reduction — clinical studies demonstrate an average reduction of 20-25% of the fat layer in the treated area per session
• Timeline — initial changes may be visible from 3 weeks, with the most dramatic results appearing at 8-12 weeks post-treatment. Results continue to improve up to 6 months
• Multiple sessions — many patients benefit from 2-3 treatments per area, spaced 6-8 weeks apart, for optimal results
• Permanent results — destroyed fat cells do not regenerate. However, remaining fat cells can still enlarge with significant weight gain
• Not a weight loss solution — cryolipolysis is designed for body contouring of localised fat deposits, not overall weight reduction. Ideal candidates are within 10-15kg of their target weight

Who Is a Good Candidate?

The ideal cryolipolysis candidate:

• Has visible, pinchable fat deposits that are resistant to diet and exercise
• Is at or near a stable, healthy body weight
• Has realistic expectations about the degree of improvement
• Is committed to maintaining results through a healthy lifestyle

Cryolipolysis is not suitable for:

• Individuals with cryoglobulinaemia, cold agglutinin disease, or paroxysmal cold haemoglobinuria
• Those with cold urticaria
• Areas with poor skin elasticity (may result in increased laxity after fat reduction)
• Hernias in or near the treatment area
• Pregnancy or breastfeeding

Potential Side Effects

Most side effects are mild and temporary:

• Common: redness, swelling, bruising, numbness, tingling, tenderness (resolving within 1-2 weeks)
• Uncommon: cramping, itching, skin sensitivity, mild pain
• Rare: Paradoxical adipose hyperplasia (PAH) — a condition where the treated area increases in size rather than decreasing. This occurs in approximately 0.005-0.39% of treatment cycles and may require liposuction to correct

“Cryolipolysis represents one of the most significant advances in non-surgical body contouring. When performed on appropriate candidates with realistic expectations, patient satisfaction rates are consistently high.” — Journal of Clinical and Aesthetic Dermatology

Frequently Asked Questions

Summary

Cryolipolysis is a scientifically validated, non-invasive approach to reducing stubborn localised fat deposits. With its excellent safety profile, minimal downtime, and proven efficacy, it has become one of the most popular non-surgical body contouring treatments worldwide. At Axiom Aesthetics, our practitioners will assess your suitability, create a personalised treatment plan, and support you through every stage of your body contouring journey.