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
Free tracker included with every download this week
Best Fruit Juice for Weight Loss — A UK Health Perspective
While certain fruit juices can be part of a balanced diet, they're often high in natural sugars and calories, making them less ideal for weight loss. Many people in the UK seeking sustainable weight management find that prescription options like Mounjaro and Wegovy offer more effective support alongside lifestyle changes. This guide explores fruit juice nutrition, compares juices by calorie content, and explains when prescription weight loss medication might be worth discussing with your GP.
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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-Licensed Prescription Weight Loss Options
If you're looking for effective weight management in the UK, prescription medications are available for eligible adults. The most commonly prescribed options are:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist, injected once weekly. Clinical trials showed participants lost an average of 15–21% of their body weight, though individual results vary.
- Wegovy (semaglutide) — a GLP-1 receptor agonist, also injected once weekly. STEP trial data showed an average weight loss of around 15% body weight.
- Saxenda (liraglutide) — a daily GLP-1 injection, slightly less commonly used than the weekly options.
All three are prescription-only medicines requiring a clinical assessment. You may be eligible if your BMI is 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. Try our GLP-1 weight loss calculator to see projected results at different doses, and use our BMI calculator to check your current BMI status.
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.
NHS vs Private Access — How to Get Started
In the UK, prescription weight loss medication can be accessed through two routes. NHS access is via specialist tier 3 weight management services — you'll need a GP referral, though waiting times vary significantly by region and can be several months to years in some areas. Private access is available through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber, with costs typically ranging from £129–£320 per month depending on dose.
Start by speaking with your GP about whether prescription weight loss support is suitable for you. They can assess your health, discuss your goals, and either refer you to NHS specialist services or advise you on private options. Track your progress with our free progress tracker whether you choose medication or lifestyle changes alone.
- 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 fruit juices good for weight loss?
Most commercial fruit juices are high in natural sugars and calories despite being promoted as healthy. A 250ml glass of orange juice contains around 110 calories and 21g of sugar. For weight loss, whole fruits are preferable to juices because they retain fibre, which helps you feel fuller. Water, unsweetened tea, and low-calorie drinks are better choices during active weight loss.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are once-weekly injections licensed for weight management in the UK. Mounjaro is a dual GIP and GLP-1 agonist and showed slightly higher average weight loss (15–21%) in trials. Wegovy is a GLP-1-only medication with average weight loss around 15%. Both require prescription and clinical assessment. Your prescriber will recommend the most suitable option for you.
Can I get weight loss medication on the NHS in the UK?
Yes, prescription weight loss medications like Mounjaro and Wegovy are available through NHS specialist tier 3 weight management services if you meet eligibility criteria (BMI 30+ or 27+ with comorbidities). Access requires a GP referral. However, NHS availability varies significantly by region, and waiting lists can be very long. Private access is an alternative through GPhC-registered online pharmacies.
How do I know if I'm eligible for prescription weight loss treatment?
You may be eligible if your BMI is 30 or above, or 27–29.9 with a weight-related health condition such as type 2 diabetes, high blood pressure, or sleep apnoea. For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds may apply. Use our free BMI calculator to check your current BMI, then discuss options with your GP.
Is prescription weight loss medication better than diet and exercise alone?
For people who have struggled with lifestyle changes alone, prescription medications can provide significant additional support. Clinical trials show they're most effective when combined with a reduced-calorie diet and increased physical activity. Weight loss medications are not replacements for healthy habits — they work alongside them. Your GP can discuss whether medication is right for your situation.
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.