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
Juice Combinations For Weight Loss — What Works?
While fresh juice can be part of a balanced diet, most standalone juice combinations won't deliver significant weight loss on their own. The good news is that UK adults struggling with weight management now have access to evidence-based prescription options alongside lifestyle changes. This guide explores juice approaches and explains the prescription weight management medications available through the NHS and private prescribing 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.
Prescription Weight Loss Options Available in the UK
If you're looking for effective weight management in the UK, prescription medications offer clinically proven support. The NHS and private prescribers can provide three main options for eligible adults:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist injection administered once weekly, with clinical trials showing an average weight loss of 15–21% of body weight
- Wegovy (semaglutide) — a once-weekly GLP-1 injection, supporting an average loss of around 15% of body weight in clinical trials
- Saxenda (liraglutide) — a daily GLP-1 injection option, though less commonly prescribed than the weekly alternatives
These are prescription-only medicines requiring a clinical assessment to confirm eligibility. They work alongside dietary changes and increased physical activity—not instead of lifestyle modifications. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, and check your BMI with our free BMI calculator to understand your starting point.
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 and How to Get Started
In the UK, prescription weight loss medication is accessed through two routes. NHS access requires referral to a specialist tier 3 weight management service, typically through your GP—availability varies by region and waiting times can be lengthy. Private access is faster: you can complete an online clinical assessment with a UK-licensed prescriber, and if suitable, receive a prescription from a GPhC-registered pharmacy.
To find out if you're eligible, check your BMI using our free weight converter and BMI calculator on this page. Adults with a BMI of 30 or above, or 27–29.9 with weight-related conditions like diabetes or high blood pressure, may qualify. Start by discussing your options with your GP—they can advise on NHS eligibility and provide a referral, or support your choice to pursue private assessment.
---COL_J_CLOSING--- Using our free progress tracker alongside medication can help you monitor results and stay motivated throughout your weight loss journey.- 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.
Can juice alone help me lose weight?
Juice alone is unlikely to produce significant weight loss. While fresh, unsweetened vegetable juices can be part of a healthy diet, they're often high in natural sugars and calories. Sustainable weight loss typically requires a calorie deficit through balanced diet, physical activity, and—for some—prescription medication if eligible.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are once-weekly injections licensed in the UK for weight management. Mounjaro works via dual GIP and GLP-1 pathways and showed 15–21% average weight loss in trials. Wegovy is a GLP-1-only medication with approximately 15% average loss. Both require prescription and clinical assessment. Your GP or prescriber will advise which suits you best.
How do I know if I'm eligible for prescription weight loss medication on the NHS?
NHS eligibility typically requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions (diabetes, high blood pressure, sleep apnoea). South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds. Speak to your GP about referral to a specialist weight management service in your area.
Can I get prescription weight loss medication privately if the NHS waiting list is too long?
Yes. Private prescribing is available through online clinical assessments with UK-licensed prescribers. If assessed as suitable, you can receive a prescription from a GPhC-registered pharmacy. This route is faster than NHS referral but involves costs, typically ranging from £129–£320 per month depending on medication and dose.
Should I stop trying dietary changes if I use prescription weight loss medication?
No. Prescription medications work best alongside lifestyle changes. Clinical trials show results are achieved with reduced-calorie diet and increased physical activity combined with medication. Medication supports these efforts by reducing appetite and cravings—it's a partnership between treatment and behaviour change.
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.