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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Green Tea for Weight Loss — What the Evidence Actually Shows
Green tea is often promoted as a weight loss aid, but how much weight can you realistically expect to lose? The truth is: green tea alone won't create dramatic weight loss. However, research suggests it may provide modest support when combined with a reduced-calorie diet and physical activity. This guide explains what the evidence shows, why it works, and most importantly — how to assess whether you're at a healthy weight for your height using your personal metrics with our free BMI calculator.
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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.
What Does Research Actually Show About Green Tea and Weight Loss?
Scientific studies on green tea and weight loss show modest but real effects. A meta-analysis of multiple trials found that green tea containing catechins (the active compounds) may help with weight loss of around 1.3 kg on average over 12 weeks — when combined with a calorie deficit. This is not dramatic, but it's measurable.
- How it works: Green tea contains catechins and caffeine, which may slightly increase fat oxidation and thermogenesis (heat production)
- Realistic expectations: Green tea is a minor supporting factor, not a weight loss solution on its own
- The key point: Weight loss fundamentally requires a calorie deficit — diet and activity matter far more than any tea
One cup of green tea contains about 25–50 mg of caffeine and varying amounts of catechins depending on brewing time and quality. Regular consumption may contribute to modest results over months, not weeks.
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.
What's More Important — Your Healthy Weight Range for Your Height
Before focusing on green tea, it's worth understanding what healthy weight for your height actually means. Your ideal weight range depends on your height, age, sex, and muscle mass — not on any single food or drink. Use our free BMI calculator above to find your personal healthy weight range according to NHS guidelines.
If you're above your healthy weight range, green tea might be a nice supporting habit, but the foundation must be: eating fewer calories than you burn, moving more, and being consistent over weeks and months. Green tea can be part of that routine — perhaps replacing sugary drinks — but it's not a substitute for these basics.
- 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 daily for weight loss?
Studies showing weight loss effects typically used 2–3 cups daily of green tea with catechins (around 200–300 mg catechins total). However, this only works alongside a calorie deficit. More tea doesn't mean more weight loss — consistency and overall diet matter more.
Will green tea alone help me lose weight without changing my diet?
No. Green tea alone will not create weight loss. You cannot out-tea a calorie surplus. Weight loss requires eating fewer calories than you burn. Green tea can support this process but cannot replace dietary change or physical activity.
How do I know if I'm at a healthy weight for my height?
Your healthy weight range depends on your height and health factors. The NHS healthy weight range is a BMI of 18.5 to 24.9 — or lower for certain ethnic groups. Calculate your personal BMI using the free BMI calculator on this page to find your range.
How long would it take to see weight loss results from green tea?
If green tea contributes to weight loss, it takes months, not weeks. The average weight loss in research was around 1.3 kg over 12 weeks — roughly 0.1 kg per week, which is very modest. Sustainable weight loss is typically 0.5–1 kg weekly with proper diet and activity.
Is green tea better than other drinks for weight loss?
Green tea is better than sugary soft drinks or high-calorie beverages — replacing these could reduce your daily calorie intake meaningfully. But plain water, herbal tea, and black tea are equally weight-loss-friendly. The key is avoiding sugary and high-calorie drinks.
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.