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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Best Green Tea For Weight Loss — And UK Prescription Alternatives
Green tea contains compounds like catechins and caffeine that may support modest weight loss, but evidence suggests the effect is small. If you're looking for effective weight management in the UK, prescription medications like Mounjaro and Wegovy are available for eligible adults and show significantly stronger clinical results. This guide explores both natural approaches and evidence-based prescription options to help you understand what's available for weight management 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.
UK-Licensed Prescription Weight Loss Options
For adults seeking effective weight management UK support, prescription medications approved by the MHRA offer clinically proven alternatives. Mounjaro (tirzepatide) is a once-weekly injection that acts as a dual GIP and GLP-1 receptor agonist—in clinical trials, participants lost an average of 15–21% of their body weight alongside a reduced-calorie diet. Wegovy (semaglutide) is a once-weekly GLP-1 injection; STEP trial data showed average weight loss of approximately 15% body weight. Saxenda (liraglutide) is a daily injection option. All three are prescription weight loss medications available in the UK and require a clinical assessment to determine eligibility.
- Mounjaro: doses 2.5–15 mg weekly, escalated gradually over 20+ weeks
- Wegovy: doses 0.25–2.4 mg weekly, titrated over approximately 16 weeks
- Saxenda: doses 0.6–3 mg daily, titrated over 3 weeks
These medications are typically used alongside lifestyle changes—not as replacements for diet and physical activity. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses.
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 Eligibility
NHS access: Weight loss medication NHS is available through specialist tier 3 and 4 weight management services, typically accessed via GP referral. Regional availability varies significantly and waiting lists can be lengthy. Private access: Available through GPhC-registered online prescribers following a clinical assessment, without NHS referral. To find out if you're eligible, calculate your BMI weight loss baseline using our free BMI calculator—adults with a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes, hypertension, or sleep apnoea, may be eligible. A GP or licensed prescriber will assess your individual health and suitability. Book a conversation with your GP to discuss lose weight UK options available to you.
- 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 tea really help you lose weight?
Green tea contains catechins and caffeine that may support modest weight loss—typically 1–3 kg over several months in clinical studies. However, the effect is small. For more significant weight loss, UK-licensed prescription medications like Mounjaro and Wegovy show much stronger clinical evidence, with average losses of 15–21% body weight.
What is the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro showed slightly higher average weight loss in trials (15–21% vs ~15% for Wegovy), but both are effective. Both are once-weekly injections. A prescriber will assess which is most suitable for you.
How do I know if I'm 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, hypertension, sleep apnoea, cardiovascular disease), may be eligible. Calculate your BMI using our free BMI calculator above. Your GP or a licensed online prescriber can formally assess your eligibility.
Is weight loss medication available on the NHS?
Yes, Mounjaro, Wegovy, and Saxenda are available on the NHS through specialist weight management services (tier 3 and 4). However, NHS availability varies by region and waiting times can be long. Private access through GPhC-registered online prescribers is faster and doesn't require NHS referral.
What should I do if I want to explore weight loss medication?
Start by talking to your GP, who can discuss your health history and options. You can also use our free GLP-1 weight loss calculator to understand potential outcomes at different doses. If you want to explore private prescribing, UK-licensed online prescribers conduct a clinical assessment to determine suitability.
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.