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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Fruit and Weight Loss — What Works in the UK
Fruit can be part of a healthy weight loss approach in the UK, but it's just one piece of the puzzle. While whole fruits contain fibre, vitamins, and minerals that support health, weight management ultimately depends on overall calorie intake and lifestyle. For adults struggling with weight management, the NHS recommends a combination of dietary changes, increased physical activity, and — where eligible — prescription medications like Mounjaro and Wegovy. This guide explains how fruit fits into a weight loss strategy and what prescription options are available to you.
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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.
UK Prescription Weight Loss Options
If you're managing your weight in the UK, prescription weight loss medication may be available to you. Three licensed options are currently available:
- Mounjaro (tirzepatide) — A once-weekly dual GIP and GLP-1 injection. Clinical trials showed participants lost an average of 15–21% of their body weight alongside diet and exercise.
- Wegovy (semaglutide) — A once-weekly GLP-1 injection. Average weight loss in trials was around 15% of body weight.
- Saxenda (liraglutide) — A daily GLP-1 injection, with similar average weight loss results.
You may be eligible for prescription weight loss medication if you have a BMI of 30 or above, or 27 or above with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea). Use our free BMI calculator above to check your starting point. Individual results vary, and these medications work best alongside diet and exercise changes.
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.
How to Access Weight Loss Treatment in the UK
NHS access: Speak to your GP about referral to a specialist weight management service. Waiting times vary by region, but this route is free through the NHS.
Private access: You can obtain a prescription through a licensed online prescriber following a clinical assessment, without waiting for NHS specialist services. Costs range from around £129–£320 per month depending on the medication and dose.
Whichever route you choose, a healthcare professional will assess whether prescription medication is appropriate for you. To help plan your weight loss journey, try our free GLP-1 weight loss calculator to see projected results at different doses, and use our weight converter to track progress in stone, lbs, or kg.
- 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.
Does eating fruit help with weight loss?
Yes, whole fruits can support weight loss. They contain fibre, which promotes satiety (feeling full), and are generally low in calories. However, weight loss depends on overall calorie intake. Fruit juice and dried fruit contain more concentrated sugar and calories, so whole fruits are the better choice. Portion control still matters.
What's the difference between NHS and private weight loss treatment?
NHS weight loss treatment is free but typically involves waiting lists to access specialist services. Private routes via licensed online prescribers are faster — usually within days — but require you to pay for the medication. Both require a clinical assessment to confirm you're eligible.
Can I get Mounjaro or Wegovy on the NHS?
Yes, both are licensed on the NHS. Access is through specialist tier 3 weight management services, usually following GP referral. However, availability and waiting times vary significantly by region. Your GP can advise on local services and referral processes.
What's the average weight loss with prescription medication?
Clinical trials show average weight loss of 15–21% of body weight with Mounjaro and around 15% with Wegovy, alongside diet and exercise. However, individual results vary considerably. Some people lose more, some less. Weight loss medications work best when combined with lifestyle changes.
How do I know if I'm eligible for weight loss medication?
You may be eligible if you have a BMI of 30 or above, or 27 or above with weight-related health conditions. Use our free BMI calculator to check your BMI instantly. Your GP or a licensed prescriber can then assess your individual eligibility and medical history.
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.