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 Does Green Tea Help With Weight Loss?
Green tea has been studied for its potential role in weight management, primarily due to compounds called catechins and caffeine. Whilst research shows modest benefits, green tea works best as part of a broader weight loss strategy combining diet, physical activity, and where appropriate, prescription weight loss medications. This guide explains the science behind green tea's effects and how it fits into a comprehensive UK weight management approach.
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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.
What's in Green Tea That May Support Weight Loss?
Green tea contains catechins, particularly EGCG (epigallocatechin gallate), alongside caffeine. These compounds may work together in several ways:
- Increasing fat oxidation: Research suggests EGCG may help your body burn fat more efficiently, especially during exercise
- Boosting metabolism: The caffeine and catechin combination may temporarily increase calorie expenditure by 3–5%
- Reducing appetite: Some studies show green tea drinkers report feeling fuller after meals
- Blood sugar regulation: Catechins may improve insulin sensitivity, supporting stable energy and reduced cravings
Most research shows effects are modest — typically contributing to modest weight loss when combined with calorie reduction and exercise. Individual results vary significantly based on baseline metabolism, diet quality, and activity level. Green tea is best viewed as a supportive tool, not a weight loss solution on its own.
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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.
Green Tea vs. Prescription Weight Loss Medication
Whilst green tea has mild supporting effects, prescription weight loss medications like GLP-1 injections offer significantly stronger clinical results. Studies show GLP-1 medications help patients lose 15–21% of body weight on average, compared to green tea's more modest contribution within an overall calorie deficit. For UK adults meeting eligibility criteria (BMI 30 or above, or 27–29.9 with weight-related health conditions), prescription options may be more effective if recommended by a prescriber. Green tea remains valuable as a supportive habit alongside diet and exercise — and can be used alongside prescription medication if appropriate. Try our GLP-1 weight loss calculator to explore realistic weight loss projections with evidence-based medication, and use the BMI calculator to check your starting point.
- 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 do I need to drink for weight loss?
Studies showing benefits typically used 2–3 cups daily (400–800mg catechins). However, effects are modest. Consistency matters more than quantity. Stick to regular consumption as part of a healthy routine, not as a standalone weight loss strategy. Always stay hydrated with water as your primary beverage.
Does green tea really boost metabolism?
Green tea may temporarily increase calorie burn by 3–5% due to caffeine and EGCG, but this is relatively small. You'd need to combine it with a calorie deficit and regular physical activity to see meaningful weight loss. It's a supportive aid, not a metabolism transformer.
Is green tea better than other teas for weight loss?
Green tea contains higher catechin levels than black or white tea, making it a slightly better choice if weight management is your goal. However, the difference is modest. Any unsweetened tea is healthier than sugary drinks. Choose whichever you'll drink consistently.
Can I use green tea instead of prescription weight loss medication?
No. Green tea offers mild support but cannot replace prescription medication like Mounjaro or Wegovy if you're eligible. If your GP refers you to a specialist weight management service or you meet criteria for private prescription weight loss treatment, these medications are far more effective. Green tea complements, not replaces, these approaches.
Should I drink green tea on the NHS weight loss plan?
Yes — green tea fits well into any UK weight management programme. It supports hydration (when unsweetened), provides beneficial compounds, and may help with appetite. However, it works best alongside structured diet changes, physical activity, and professional support. Use our progress tracker to monitor your overall weight loss journey across all contributing factors.
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.