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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Can Green Tea Help With Weight Loss?
Green tea has been studied for its potential role in weight management, and the evidence suggests it may offer modest benefits when combined with other healthy habits. However, it's not a standalone solution for weight loss. Research indicates that compounds in green tea, particularly catechins and caffeine, may slightly increase fat burning and metabolic rate. The effect is typically small — usually a loss of around 1–2 kg over several months — but it may be worth including as part of a broader weight loss strategy alongside diet and physical activity. For significant weight loss, most NHS guidance recommends combining lifestyle changes with professional support if needed.
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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 the Science Say About Green Tea and Weight Loss?
Multiple clinical studies have examined whether green tea supports weight loss. A meta-analysis of randomised controlled trials found that green tea consumption was associated with modest weight loss and fat loss, though the effect was small and varied between individuals.
Key compounds in green tea:
- Catechins — polyphenols that may increase fat oxidation, especially during exercise
- Caffeine — stimulates metabolism and may increase calorie burning by 3–5%
- EGCG (epigallocatechin gallate) — the main catechin studied for metabolic effects
Most studies showing positive results used green tea extract concentrated doses (270–300 mg catechins daily), rather than regular brewed green tea. Brewed green tea contains lower concentrations of these compounds. The weight loss observed in trials was typically 1–2 kg over 8–12 weeks when combined with diet and exercise — modest but measurable.
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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.
How to Use Green Tea Effectively for Weight Management
If you're considering green tea as part of your weight management UK strategy, consistency matters. Drinking 2–3 cups of green tea daily (or taking a standardised extract under guidance) may offer small benefits, but it works best alongside a reduced-calorie diet and physical activity. Green tea is not a replacement for lifestyle changes or prescription weight loss medication.
Green tea is generally safe for most adults, though excessive consumption can cause caffeine-related side effects like jitteriness or sleep disruption. If you're taking medications, check with your GP before using green tea supplements, as they can interact with certain drugs. For personalised weight management advice, use our free BMI calculator to understand your starting point, and speak with your GP about what combination of approaches — diet, exercise, and potentially medication — is right 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?
Research suggests 2–3 cups of brewed green tea daily, or 270–300 mg of catechins from extract form. However, effects are modest (1–2 kg over several months). Green tea works best as part of a broader strategy including reduced calories and exercise, not as a standalone solution. Always consult your GP if you have health concerns.
Is green tea extract better than brewed green tea for weight loss?
Green tea extract contains concentrated catechins (the active compounds), typically 3–5 times more than brewed tea. Studies showing stronger weight loss effects often used extract. However, brewed tea is more accessible and still offers benefits. Both are safe, but extracts may provide faster effects at lower consumption volumes.
Can green tea replace prescription weight loss medication?
No. Green tea offers only modest weight loss effects (1–2 kg). For significant weight loss, especially if you have a BMI over 30 or weight-related health conditions, your GP may recommend prescription weight loss medication like Mounjaro or Wegovy alongside lifestyle changes. These prescription options show much larger weight loss results in clinical trials.
What's the difference between weight loss through green tea and through GLP-1 medication?
Green tea may increase fat burning by 3–5%, resulting in around 1–2 kg loss over months. GLP-1 medications (Mounjaro, Wegovy) work through a different mechanism — they reduce appetite and help you eat less — and show average weight loss of 15–21% of body weight in trials. If you're interested in prescription weight loss options, speak with your GP about NHS weight loss pathways.
Are there any side effects from drinking green tea for weight loss?
Green tea is generally safe for most adults. Common side effects from high consumption include caffeine jitteriness, sleep disruption, and stomach upset. Rare side effects include liver issues at extremely high doses. If you're pregnant, breastfeeding, or take medications (especially blood thinners or beta-blockers), check with your GP before using green tea supplements regularly.
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.