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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Does Green Tea Help with Weight Loss?
Green tea is often promoted as a weight loss aid, but what does the evidence actually show? While green tea contains compounds that may support metabolism, the reality is more nuanced than popular claims suggest. This guide explains what research tells us about green tea and weight loss, and how it fits into an effective weight management approach in the UK.
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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 Does the Research Show About Green Tea?
Clinical studies suggest green tea may have a modest effect on weight and fat metabolism, but the impact is small. Research published in obesity journals indicates that catechins and caffeine in green tea may slightly increase fat oxidation — the process of breaking down stored fat for energy. However, the average weight loss associated with green tea consumption alone is typically between 0.5 kg to 1.5 kg over 8–12 weeks, which is minimal.
A 2019 meta-analysis found that green tea extract supplements produced an average weight loss of approximately 1.3 kg more than placebo when combined with a reduced-calorie diet. Importantly, no significant weight loss occurred without dietary changes. This means green tea is not a weight loss solution on its own — it may only provide a small additional benefit alongside lifestyle modifications. The effect is also more noticeable in people of Asian descent, where some studies show slightly better responses.
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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.
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How to Use Green Tea for Weight Loss UK Context
If you're interested in green tea as part of a weight management strategy, aim for 2–3 cups daily of brewed green tea, which contains approximately 25–50 mg of caffeine per cup and natural catechins. Green tea extract supplements are also available but should be used cautiously — excessive intake may cause side effects including liver stress or caffeine-related symptoms like anxiety or sleep disruption.
Green tea works best as one small part of a comprehensive approach that includes a balanced diet, regular physical activity, and sustainable lifestyle changes. If you have concerns about your weight or need personalised guidance, your GP can discuss evidence-based options including prescription weight loss medication if appropriate, or refer you to an NHS-funded weight management service.
- 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.
Is green tea better than prescription weight loss medication?
No. While green tea may provide minor metabolic support, prescription weight management medications like Wegovy (semaglutide) show significantly larger effects in clinical trials — averaging clinically studied weight loss. Prescription medications require a clinical assessment and are suited for specific medical profiles. Green tea is a supportive beverage choice, not a replacement for evidence-based medical treatment.
How much green tea should I drink daily for weight loss?
Research suggests 2–3 cups of brewed green tea daily (not supplements) provides the most evidence-based benefit. This delivers approximately 200–300 mg of catechins. Higher doses don't necessarily produce better results and may increase caffeine-related side effects. Consistency matters more than quantity — regular daily consumption is more effective than occasional use.
Can I lose weight with green tea alone without changing my diet?
Studies show that green tea alone — without dietary changes — produces negligible weight loss. Any benefit occurs only when combined with a reduced-calorie diet and increased physical activity. Green tea is a supportive tool within a wider weight management strategy, not a standalone solution. For sustainable weight loss, focus on calorie balance first.
Is green tea safe for everyone in the UK?
Green tea is generally safe for most adults, but certain groups should be cautious. Pregnant or breastfeeding women should limit intake to 1–2 cups daily due to caffeine. People with liver conditions, anaemia, or those taking certain medications (including some blood thinners) should consult their GP before regular consumption. Always discuss with your healthcare provider if you have health concerns.
How does green tea compare to other natural weight loss approaches?
Green tea has more research support than many herbal supplements, but its effect remains modest — similar to increased water intake or slightly increased physical activity. For weight loss in the UK context, NHS guidance recommends calorie deficit (approximately 500 kcal/day for 0.5 kg weekly loss) as the primary strategy. Green tea complements this approach but shouldn't replace core dietary and lifestyle changes.
Ready to take control of your weight loss journey?
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