The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Fat Injections in the UK — What You Need to Know
Fat injections, sometimes called fat transfer or autologous fat grafting, are cosmetic procedures used in the UK for facial volume enhancement and body contouring. Unlike weight loss injections (GLP-1 medications such as Mounjaro or Wegovy), fat injections are surgical cosmetic treatments. Understanding the difference between cosmetic procedures and prescription weight management is important for making informed health decisions. This UK health guide explains how fat injections work, safety considerations, and where they fit within UK health regulation and NHS guidance.
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Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
Fat Injections vs Weight Loss Treatments — Key Differences
It's easy to confuse fat injections with weight loss injections, but they are fundamentally different treatments. Fat injections are cosmetic surgical procedures where fat is harvested from one area of your body (usually the abdomen or thighs) and injected into another area, typically the face or hands, to restore volume or enhance appearance. They are not regulated by the MHRA in the same way as medications.
Weight loss injections (such as Mounjaro and Wegovy) are prescription-only medications that work through the GLP-1 or GIP/GLP-1 hormone pathways to support appetite control and weight management. These are regulated pharmaceutical treatments requiring clinical assessment before prescription. If you're interested in weight management support, use our free BMI calculator above to understand your current health status, and your GP can discuss prescription options if appropriate for your health profile.
Fat injections do not affect weight or BMI — they are purely cosmetic, whereas weight loss medications address metabolic health. Understanding this distinction helps you choose the right treatment for your specific health goal.
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
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UK Regulation and Safety Considerations for Fat Injections
Fat injection procedures in the UK must be performed by qualified surgeons, typically registered with the GMC (General Medical Council). The procedure is not funded by the NHS as it is classified as cosmetic rather than medical treatment. Private cosmetic clinics offering fat transfer are regulated under CQC standards, though quality and safety standards can vary.
Safety considerations include:
- Risk of infection or bruising at harvest and injection sites
- Unpredictable fat graft survival rates (typically 40–80% of transferred fat is retained)
- Asymmetry or overcorrection requiring revision
- Rare but serious risks including fat embolism
Before considering any cosmetic procedure, consult your GP for general health advice. For weight and health concerns, our free weight converter and BMI calculator can help you understand your baseline health metrics and identify appropriate next steps with your healthcare provider.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Are fat injections the same as weight loss injections?
No. Fat injections are cosmetic surgical procedures transferring fat between body areas. Weight loss injections (like Mounjaro and Wegovy) are prescription medications affecting appetite and metabolism. Fat injections do not cause weight loss; weight loss injections do not inject fat. They address completely different health goals and are regulated differently in the UK.
Is fat injection treatment available on the NHS in the UK?
Fat transfer procedures are not routinely funded by the NHS as they are classified as cosmetic treatments rather than medically necessary procedures. They are available privately through cosmetic surgery clinics. If you have reconstructive needs following injury or surgery, your GP can discuss whether NHS funding may apply in exceptional cases.
What is the success rate of fat injection procedures?
Fat graft survival rates typically range from 40–80%, meaning not all transferred fat survives. Results vary based on surgical technique, patient factors, and aftercare. Multiple procedures are sometimes needed to achieve desired results. A qualified surgeon will discuss realistic expectations during consultation.
How long do results from fat injections last?
Results can be permanent if the transferred fat successfully integrates. However, some fat is reabsorbed, so initial results may soften over months. Weight fluctuation, ageing, and natural fat loss over time can affect longevity. Many people maintain results for years with a stable weight.
Should I consider fat injections or weight loss treatment instead?
These serve different purposes. Fat injections are purely cosmetic. If you have concerns about weight, health, or BMI, consult your GP. Use our free BMI calculator to assess your current health metrics. Your GP can discuss appropriate weight management options, which may include lifestyle changes or prescription medication if clinically suitable for you.
Ready to take control of your weight loss journey?
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