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
Does Green Tea Aid Weight Loss?
Green tea contains compounds like catechins and caffeine that have been studied for potential weight loss benefits. However, research shows the effects are modest — typically contributing only small amounts to overall weight loss when combined with diet and exercise. If you're looking for more significant weight management support in the UK, prescription medications and evidence-based approaches are available for eligible adults. This guide explains what the science shows about green tea, and introduces the prescription weight loss options your GP can discuss with you.
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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 Prescription Weight Management Options
For adults struggling with weight management, the UK has prescription medications specifically licensed for weight loss. These are available through the NHS (via specialist weight management services) or privately through licensed prescribers.
Three main options are available:
- Mounjaro (tirzepatide) — A dual GIP/GLP-1 injection. Clinical trials showed an average weight loss of 15–21% of body weight over 72 weeks, alongside diet and exercise.
- Wegovy (semaglutide) — A GLP-1 injection. Evidence suggests an average weight loss of approximately 15% of body weight.
- Saxenda (liraglutide) — A daily GLP-1 injection, with similar weight loss support to Wegovy.
These are prescription-only medicines requiring clinical assessment. Try our GLP-1 weight loss calculator to estimate potential results at different doses if you're eligible.
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 or Private Access — How to Find Out if You're Eligible
Eligibility for prescription weight loss medication in the UK depends on your BMI and health profile. You may qualify if you have a BMI of 30 or above, or 27–29.9 with weight-related conditions like type 2 diabetes, high blood pressure, or sleep apnoea.
NHS route: Ask your GP for a referral to a tier 3 weight management service. Access varies by region, and waiting lists can be lengthy.
Private route: A UK-licensed prescriber can assess you via online consultation if you meet the criteria.
Either way, use our free BMI calculator to check your personal BMI first — this helps you understand where you stand and what to discuss with your GP or prescriber.
- 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.
Does green tea actually help you lose weight?
Green tea contains catechins and caffeine, which may provide a small boost to metabolism and fat burning. However, research shows the effect is modest — typically contributing just 1–3kg of additional loss over several months when combined with diet and exercise. It's not a weight loss solution on its own, but may complement a healthy lifestyle.
What's the difference between green tea and prescription weight loss medication?
Green tea is a supplement with minor effects on weight. Prescription medications like Mounjaro and Wegovy are licensed medicines that work through hormone pathways to reduce appetite and support significant weight loss (average 15–21% of body weight). They require clinical assessment and a prescription, but evidence for their effectiveness is much stronger.
How do I know if I'm eligible for prescription weight loss medication in the UK?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with a weight-related health condition. Use our free BMI calculator to check your personal BMI, then speak to your GP about referral to a specialist weight management service or consider private assessment through a licensed prescriber.
Can I combine green tea with prescription weight loss medication?
Yes, green tea is generally safe alongside prescription medications. However, always inform your prescriber about all supplements and drinks you consume, as some may interact with medications or contain caffeine that could affect side effects.
What does the NHS recommend for weight management in the UK?
The NHS recommends a combination of dietary changes, increased physical activity, and behavioural support as the first step. For eligible adults, prescription weight loss medication may be offered through specialist services. Sustainable weight loss is typically 0.5–1kg per week.
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.