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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Do Tummy Belts Work for Weight Loss?
Tummy belts and waist trainers are popular weight loss products, but scientific evidence shows they don't actually reduce body fat or support sustainable weight loss. While they may create a temporary slimming appearance, they don't address the underlying factors that contribute to weight gain. If you're looking for genuine weight management support, evidence-based approaches like calorie deficit, increased physical activity, and prescription weight loss medication (when clinically appropriate) are far more effective. This guide explains why tummy belts fall short and what actually works for weight loss in the UK.
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Calculate Your BMI Instantly
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.
Why Tummy Belts Don't Work for Weight Loss
Tummy belts and waist trainers don't reduce body fat because they don't create the conditions needed for weight loss. Here's why:
- No calorie deficit: Weight loss requires your body to burn more calories than you consume. A belt doesn't change calorie intake or expenditure.
- No metabolic effect: These products don't increase metabolism or fat burning. Wearing one for hours doesn't activate the body's natural weight loss mechanisms.
- Temporary appearance only: Any slimming effect is temporary compression — the moment you remove the belt, your body returns to its normal shape.
- No evidence base: Clinical studies show no significant weight loss or body fat reduction from waist trainers or compression belts.
- Potential risks: Wearing tight compression belts for extended periods can cause digestive discomfort, reduced circulation, and skin irritation.
If you're interested in effective weight loss, calculating your BMI and creating a realistic plan with your GP is a better starting point than any compression device.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
What Actually Works for Weight Loss in the UK
Proven approaches to weight loss include creating a calorie deficit through diet and physical activity, losing at a sustainable rate of 0.5–1 kg per week. The NHS recommends lifestyle changes first, including reduced-calorie diets and increased activity. For weight management through GLP-1 weight loss medication (such as Wegovy or Mounjaro), eligibility typically starts at a BMI of 30 or above, or 27 with weight-related health conditions. These prescription medications work alongside dietary changes, not as replacements. Your GP can assess whether prescription weight loss medication is appropriate for you. Use our GLP-1 weight loss calculator to explore potential outcomes, and our BMI calculator to establish your starting point.
- 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.
Do waist trainers actually reduce belly fat?
No. Waist trainers and tummy belts only compress abdominal tissue temporarily — they don't reduce body fat or change your metabolism. Any slimming effect disappears when you remove the belt. Fat loss requires a calorie deficit created through diet and exercise, not external compression.
Can tummy belts help with weight loss if worn for hours?
Wearing a tummy belt longer doesn't increase weight loss. Prolonged compression can actually cause discomfort, reduce circulation, and affect digestion. Weight loss comes from calorie deficit and lifestyle changes, not from wearing compression garments.
What's a more effective alternative to tummy belts?
Evidence-based weight loss combines a reduced-calorie diet, increased physical activity, and (if eligible) prescription weight loss medication. Your GP can refer you to NHS weight management services, or you can calculate your BMI and explore your options using our free BMI calculator to understand your starting point.
Are prescription weight loss injections better than tummy belts?
Yes. Prescription medications like Wegovy and Mounjaro have clinical trial evidence showing 15–21% average body weight loss when used alongside diet and exercise. Unlike tummy belts, they actually change how your body regulates appetite and metabolism. You'll need a prescription and clinical assessment from your GP or a licensed prescriber.
How do I know if I'm eligible for weight loss medication on the NHS?
NHS weight loss medication is typically available through specialist tier 3 services for adults with a BMI of 30 or above, or 27 with weight-related conditions like diabetes or high blood pressure. Your GP can refer you, though waiting lists vary by region. Alternatively, private prescribing is available through online clinics registered with the GPhC.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.