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 Drink Recipe For Weight Loss — Medication & NHS Options
Green drinks can be a helpful part of a weight management UK plan, packed with nutrients and low in calories. However, for adults struggling with their weight, prescription weight loss medication may also be an option worth discussing with your GP. The UK now offers several evidence-based medications — including Mounjaro and Wegovy — alongside lifestyle changes. This guide explores both nutritional approaches and prescription options available in the UK for eligible adults.
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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 to lose weight uk, prescription medications can support your efforts alongside dietary changes like green drinks. Three main options are available in the UK:
- Mounjaro (tirzepatide) — a once-weekly injection that works on two hormone pathways, helping regulate appetite and support feeling fuller after meals. Clinical trials showed participants lost an average of 15–21% of their body weight.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection that may help reduce cravings and support weight loss. Clinical evidence suggests average weight loss of around 15% of body weight.
- Saxenda (liraglutide) — a daily injection option, typically used when weekly injections aren't suitable.
Eligibility depends on your BMI and health conditions. Use our free BMI calculator above to check where you fall, and discuss prescription options with your GP if you meet the criteria.
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 & Getting Started
In the UK, prescription weight loss medication is available through two routes. NHS access is through specialist tier 3 weight management services — you'll need a GP referral, though waiting lists vary significantly by region. Private access is available through GPhC-registered online prescribers following a clinical assessment, without NHS referral.
Start by speaking with your GP about whether you're eligible. You'll be assessed based on your BMI, health history, and weight-related conditions. Remember, medication works best alongside a reduced-calorie diet (where green drinks can play a nutritious role) and increased physical activity. Our GLP-1 weight loss calculator can help you explore potential weight loss projections if medication is recommended.
- 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 drinks alone help me lose weight?
Green drinks can support weight loss as part of a calorie-controlled diet — they're nutrient-dense and low in calories. However, sustainable weight loss requires an overall calorie deficit and lifestyle changes. For some adults, prescription medication alongside dietary changes may be more effective.
Who is eligible for Mounjaro or Wegovy in the UK?
Adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease), may be eligible. South Asian, Chinese, Black African, or Black Caribbean adults may qualify at slightly lower BMI thresholds. Your GP can assess your individual eligibility.
How much weight can I lose with prescription weight loss medication?
Clinical trials show average weight loss of 15–21% of body weight with Mounjaro and around 15% with Wegovy — though individual results vary significantly. Weight loss depends on your starting weight, adherence to diet and exercise, and how your body responds to the medication.
How long does prescription weight loss treatment last?
Prescription weight loss injections are typically used for 12–24 months, depending on your progress and response. Treatment is ongoing while you're taking the medication. Once you stop, maintaining weight loss depends on sustained lifestyle changes — diet, exercise, and healthy habits.
What's the difference between using green drinks and medication for weight loss?
Green drinks provide nutrition and support a calorie deficit through their low calorie content. Prescription medications work on appetite and hormone regulation to support weight loss alongside dietary changes. Many people benefit from combining both — nutritious whole foods (including green drinks) plus, if eligible, medical support.
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.