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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How to Consume Green Tea for Weight Loss in the UK
Green tea is often promoted as a weight loss aid, and whilst it contains compounds that may support metabolism, the evidence for significant weight loss is limited. If you're looking to lose weight in the UK, there are more effective options available — including prescription medications and NHS weight management services. This guide explores green tea's role in weight loss and compares it to evidence-backed approaches available through the NHS and private prescribing.
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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.
Green Tea and Weight Loss: What the Evidence Shows
Green tea contains catechins and caffeine, which some research suggests may slightly boost fat oxidation and thermogenesis (heat production). However, the weight loss effect is modest — typically 1–3 kg over 12 weeks in clinical studies, and only when combined with calorie restriction and exercise.
- Catechins: May increase fat burning by approximately 3–5% in some studies
- Caffeine: Provides a mild metabolic boost and appetite suppression
- Realistic expectations: Green tea is a supplement, not a treatment — it works alongside lifestyle changes, not instead of them
For meaningful weight loss, the NHS emphasises that creating a calorie deficit through diet and physical activity remains the foundation. If green tea helps you drink more fluids and avoid sugary drinks, that's a practical benefit — but it's not a substitute for sustainable dietary 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.
Prescription Weight Management Options in the UK
If you're seeking more effective weight management, the UK offers prescription medications licensed specifically for weight loss. These include Mounjaro (tirzepatide) and Wegovy (semaglutide) — GLP-1 receptor agonists that may help reduce appetite and support weight loss alongside lifestyle changes.
- Adults with a BMI of 30 or above, or 27+ with weight-related health conditions, may be eligible
- Clinical trials showed average weight loss of 15–21% body weight on Mounjaro
- Available through NHS specialist services or private prescribing following clinical assessment
Try our free GLP-1 weight loss calculator to estimate potential results at different doses, and use the BMI calculator above to check your starting point. Your GP can discuss whether prescription weight management is appropriate for 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.
How much green tea should I drink daily for weight loss?
Typical studies use 2–3 cups (400–800 mg catechins) daily. However, more green tea doesn't assures more weight loss. Excessive caffeine can cause jitteriness, sleep disruption, and increased heart rate. Stick to 2–3 cups and combine with calorie reduction and exercise for best results.
Is green tea more effective than prescription weight loss medication in the UK?
No. Clinical evidence strongly favours prescription medications like Mounjaro and Wegovy, which show 15–21% average body weight loss. Green tea shows modest effects (1–3 kg). If you're eligible for prescription treatment, discuss this with your GP — it's far more effective than supplements alone.
Can I use green tea alongside Mounjaro or Wegovy?
Yes, green tea is safe alongside these medications. However, check with your prescriber first, especially regarding caffeine intake. Weight loss medications work through appetite reduction, so green tea's modest metabolic boost adds little additional benefit compared to the medication's effects.
What's the difference between green tea and weight loss injections available on the NHS?
Green tea is a dietary supplement with minimal weight loss evidence. NHS weight loss injections (Mounjaro, Wegovy, Saxenda) are prescription-only medications requiring clinical assessment. They've demonstrated significant weight loss in clinical trials and are prescribed as part of specialist weight management services.
How do I find out if I'm eligible for prescription weight management in the UK?
Start by speaking to your GP. You may be eligible if you have a BMI of 30+, or 27+ with weight-related conditions like type 2 diabetes or high blood pressure. Your GP can refer you to your local NHS specialist weight management service, or you can access private prescribing through a licensed UK prescriber online.
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.