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
Free tracker included with every download this week
Green Tea and Weight Loss — What UK Evidence Shows
Green tea is often promoted as a weight loss aid, but the reality is more nuanced. Research suggests green tea may provide modest support for weight management — typically helping with a weight loss of around 1–3 kg over several months when combined with a healthy diet and exercise. However, it's not a standalone solution. Your ideal weight depends on your height, age, and individual health factors, which is why the NHS recommends using your BMI (Body Mass Index) as a starting point. If you're looking to manage your weight, understanding what healthy weight for your height actually means is far more important than any single food or drink.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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?
Several scientific studies have examined green tea's effects on weight and metabolism. The key findings are:
- Modest thermogenic effect: Green tea contains catechins (antioxidants) and caffeine, which may slightly increase fat burning — typically 3–5% above baseline metabolism
- Small average weight loss: Meta-analyses of controlled trials show average weight loss of 1.3 to 2.5 kg over 8–16 weeks, but individual results vary significantly
- Not a effective solution: Weight loss from green tea alone is minimal; it works best alongside a reduced-calorie diet and physical activity
- Caffeine sensitivity: Some people are more responsive to green tea's effects than others depending on genetics and caffeine tolerance
The NHS acknowledges green tea as part of a healthy lifestyle, but emphasises that sustainable weight loss requires a calorie deficit achieved through diet and exercise. Use our free BMI calculator above to understand your current healthy weight range for your height, then build realistic dietary and activity changes from there.
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.
Your Healthy Weight Range — The Foundation of Weight Management
Rather than chasing weight loss from green tea, it's more effective to establish what healthy weight for your height actually is. According to NHS guidelines, a healthy BMI ranges from 18.5 to 24.9 for most UK adults.
- For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, a healthy BMI starts at 18.5 but peaks at 22.9 — slightly lower thresholds apply due to increased health risk at higher BMI levels
- Your healthy weight range depends on muscle mass, frame size, age, and individual health factors — not just height
- Try our free weight converter and BMI calculator above to find your personal healthy weight range
If you're consistently above your healthy weight range, sustainable changes to diet quality, portion sizes, and activity levels will have far more impact than green tea alone. For significant weight management, your GP can discuss options including structured lifestyle programmes or, if eligible, prescription support.
- 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 weight can I lose from drinking green tea?
Research suggests green tea may contribute to 1–3 kg weight loss over several months when combined with a healthy diet and exercise. However, it's not a standalone solution. The catechins and caffeine in green tea may slightly boost metabolism (around 3–5%), but this is modest compared to the impact of calorie deficit and physical activity.
Is green tea better than other teas for weight loss?
Green tea does have more catechins than black or white tea, which is why it's studied most. However, the difference in real-world weight loss is small. Black tea and oolong tea also contain beneficial compounds. The most important factor is replacing high-calorie drinks (like sugary soft drinks or full-fat lattes) with unsweetened green tea, which reduces overall calorie intake.
How much green tea should I drink daily for weight loss?
Studies typically used 2–4 cups of green tea daily (or equivalent in extract form). However, drinking excessive amounts offers no additional benefit and may cause caffeine-related side effects like sleep disruption or anxiety. The NHS recommends moderation: 2–3 cups of green tea daily is reasonable and safe for most adults. Always check with your GP if you're taking medications, as green tea can interact with some drugs.
What's more important — green tea or my overall diet?
Your overall diet is far more important than green tea. A healthy BMI depends on maintaining a calorie deficit through balanced eating and activity. Green tea might provide a small boost, but cutting 500 calories per day through diet and exercise will have far more impact on weight loss than any supplement. Use our free BMI calculator to establish your healthy weight range for your height, then focus on sustainable dietary changes.
Can I lose weight with green tea alone, without exercise?
No. Green tea cannot produce meaningful weight loss without a calorie deficit. You need to either reduce calorie intake through diet, increase activity, or both. Exercise also builds muscle, which supports long-term weight management. The NHS recommends 150 minutes of moderate activity weekly alongside dietary changes. Green tea is only a minor supporting factor, not a replacement for lifestyle change.
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.