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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Green Fruit Smoothies For Weight Loss — And Other UK Options
Green fruit smoothies can be a helpful part of a weight management strategy, packed with nutrients and natural sugars that may support satiety. However, if you're looking at weight management in the UK, it's worth knowing about all available options — including prescription medications that are now available through the NHS and private prescribing. This guide covers smoothies, medication eligibility, and how to find the right approach for your situation.
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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 Medication Available in the UK
If you're struggling with weight management, prescription weight loss injections are now licensed in the UK for eligible adults. Three main options are available:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist, once-weekly injection. Clinical trials showed participants lost an average of 15–21% of their body weight alongside diet and exercise.
- Wegovy (semaglutide) — a GLP-1 receptor agonist, once-weekly injection. Average weight loss in trials was around 15% of body weight.
- Saxenda (liraglutide) — a GLP-1 receptor agonist, daily injection. Effective for weight management but requires more frequent injections than Mounjaro or Wegovy.
These medications work by reducing appetite and helping you feel fuller after smaller meals. They are prescription-only and require a clinical assessment to confirm they're suitable for you. Results vary between individuals, and they work best alongside dietary changes and increased physical activity — not as a replacement for lifestyle changes.
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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.
Who is Eligible for Prescription Weight Loss Treatment in the UK?
You may be eligible for prescription weight loss medication in the UK if you have a BMI of 30 or above, or a BMI of 27–29.9 with at least one weight-related health condition (such as type 2 diabetes, high blood pressure, or cardiovascular disease). If you are of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds may apply due to higher health risks at these weights.
Access in the UK is available through two routes: NHS specialist weight management services (via GP referral, though waiting lists vary by region) or private online prescribing following a clinical assessment. Try our free BMI calculator above to check your starting point, then discuss options with your GP or a licensed prescriber to explore what's suitable for your individual situation.
- 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 fruit smoothies alone help me lose weight?
Green smoothies can support weight loss as part of a calorie-controlled diet — they're nutrient-rich and may help you feel fuller. However, sustainable weight loss typically requires a consistent calorie deficit of around 500 kcal per day, combined with physical activity. Smoothies are most effective as part of a broader approach, not as a standalone solution.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are once-weekly injections licensed in the UK for weight management. Mounjaro uses a dual GIP and GLP-1 mechanism and showed average weight loss of 15–21% in clinical trials. Wegovy uses GLP-1 only and showed around 15% average weight loss. Both require a prescription and clinical assessment. Individual results vary, and the choice depends on your health profile and prescriber recommendation.
How do I find out if I'm eligible for prescription weight loss medication in the UK?
Start by calculating your BMI using our free BMI calculator on this page. If your BMI is 30 or above, or 27–29.9 with weight-related health conditions, you may be eligible. Speak to your GP about referral to a specialist weight management service, or contact a private online prescriber for a clinical assessment. Your prescriber will confirm eligibility based on your individual health.
Is prescription weight loss medication available on the NHS in the UK?
Yes — Mounjaro, Wegovy, and Saxenda are approved by NICE and available through NHS specialist weight management services. Access is typically through GP referral to tier 3 services. Availability and waiting times vary significantly by region. Private prescribing is also available through licensed UK prescribers if you don't wish to wait for NHS services.
Can I use green smoothies alongside prescription weight loss medication?
Yes — prescription weight loss medications work best alongside dietary changes and increased physical activity. Green smoothies can be part of a healthy, balanced diet when used sensibly. However, because these medications slow stomach emptying and reduce appetite, very thick smoothies or high-calorie drinks may cause discomfort. Discuss your diet plan with your prescriber or a registered dietitian for personalised guidance.
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.