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
Green Juice Recipes for Weight Loss in the UK
Green juice recipes can be part of a healthy weight management approach, but sustainable weight loss typically requires a combination of dietary changes, physical activity, and sometimes medical support. In the UK, adults who meet certain criteria may also be eligible for prescription weight loss medication alongside lifestyle changes. This guide covers simple green juice ideas and explains the prescription weight management options available through the NHS and private prescribing.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 looking to lose weight uk, prescription medication may be an option alongside dietary changes like incorporating green juice into your routine. Three main weight loss medications are licensed for use in the UK:
- Mounjaro (tirzepatide) — a once-weekly injection that is a dual GIP and GLP-1 receptor agonist. Clinical trials showed participants lost an average of 15–21% of their body weight over 72 weeks.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. Clinical trials showed average weight loss of around 15% of body weight.
- Saxenda (liraglutide) — a daily GLP-1 injection, with similar efficacy to Wegovy.
These are prescription-only medicines and are not for everyone. You must meet specific eligibility criteria: typically a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Your GP can assess whether you qualify and refer you to appropriate services.
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 Next Steps
In the UK, you can access prescription weight loss medication through either the NHS or private prescribing. NHS access is through tier 3 specialist weight management services — your GP can refer you, though waiting lists vary by region. Private access is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber, with no NHS referral required.
To find out if prescription weight loss medication is right for you, arrange a consultation with your GP or use a private prescribing service for an online assessment. Our free BMI calculator above helps you check your current BMI instantly. Whichever route you choose, prescription medication works best alongside the lifestyle changes you're already making — like adding nutritious green juice to your diet.
- 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 green juice alone help me lose weight?
Green juice can be part of a healthy diet and provide nutrients, but sustainable weight loss requires a calorie deficit alongside physical activity. Green juice is beneficial when included within a balanced eating plan, but it is not a standalone weight loss solution. The NHS recommends combining dietary changes with increased activity for best results.
Who is eligible for prescription weight loss medication in the UK?
Adults with a BMI of 30 or above, or 27 or above with weight-related health conditions (type 2 diabetes, high blood pressure, sleep apnoea, heart disease), may be eligible. South Asian, Chinese, Black African, or Black Caribbean adults may qualify at slightly lower BMI thresholds. Your GP or a licensed prescriber can assess your individual eligibility.
What is the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro clinical trials showed slightly higher average weight loss (15–21% vs 15%), but both are effective. Both are once-weekly injections. Individual results vary significantly, and the choice depends on your personal health profile and prescriber recommendation.
How long does it take to see weight loss results with prescription medication?
Weight loss typically becomes noticeable within 4–8 weeks, though some people see changes earlier. Clinical trials measured results over 68–72 weeks. Weight loss medication works best alongside reduced-calorie diet and increased physical activity. Use our free progress tracker to log your weight loss journey and monitor changes over time.
Can I get weight loss injections through the NHS?
Yes — Mounjaro and Wegovy are available through NHS specialist tier 3 weight management services. Access is via GP referral to your local specialist service. Availability and waiting times vary significantly by region and ICB. If NHS waiting times are long in your area, private prescribing is also available through GPhC-registered pharmacies without a referral.
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.