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
Does Green Tea Help with Weight Loss?
Green tea has become popular as a natural weight loss aid in the UK, but the evidence is more modest than marketing suggests. Research shows green tea may support weight management through its active compounds, particularly catechins and caffeine, but the effect is small. This guide explains what the science actually shows, how green tea compares to other approaches, and whether it fits into a realistic weight loss plan alongside NHS-recommended strategies.
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.
How Green Tea May Support Weight Loss
Green tea contains catechins — a type of antioxidant — and caffeine, both of which may have a modest effect on metabolism and fat oxidation. Several studies suggest green tea drinkers may lose slightly more weight than those drinking caffeine-free alternatives, though the difference is typically small (around 1–3 kg over several months).
- Metabolism boost: Caffeine and catechins may increase fat burning slightly, particularly during exercise
- Appetite management: Some evidence suggests green tea may reduce hunger slightly, though this varies between individuals
- Fat absorption: Catechins may interfere slightly with dietary fat absorption in the gut
However, these effects are modest. Green tea alone is not effective for significant weight loss — it works best alongside a reduced-calorie diet and increased physical activity. If you're looking at NHS weight management options or prescription weight loss injections like Mounjaro or Wegovy, green tea would be a complementary choice, not a replacement.
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.
Green Tea vs Prescription Weight Loss & NHS Approaches
For meaningful weight management in the UK, the NHS recommends a combined approach: dietary changes, increased physical activity, and — where eligible — prescription support. Green tea can be part of this, but it's not sufficient on its own.
If you have a BMI over 25 with weight-related health conditions, or a BMI over 30, your GP may refer you to a specialist weight management service. Calculate your BMI using our free BMI calculator to check your current position, then discuss your goals with your GP. For those using GLP-1 weight loss medication through NHS or private routes, green tea is safe alongside treatment and may offer minor additional support as part of a balanced approach.
- 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 weight loss effects typically used 2–3 cups per day (providing 200–300mg of catechins). However, the overall weight loss was modest — around 1–3 kg over months. Regular consumption is needed; occasional green tea won't produce results. Always check with your GP if you're on medications, as caffeine can interact with some prescriptions.
Is green tea better than other teas for weight loss?
Green tea contains more catechins than black tea, but white tea has similar levels. Herbal teas like peppermint don't contain catechins but may aid digestion. The difference between green and black tea is relatively small. Choose the tea you enjoy most and drink regularly — consistency matters more than type.
Can green tea replace prescription weight loss medication?
No. Green tea's effects on weight are minimal compared to prescription medications like Mounjaro or Wegovy, which can support 15–clinically studied weight loss in clinical trials. Green tea is a complementary lifestyle choice, not a treatment. If eligible for prescription support through the NHS or private providers, discuss options with your GP rather than relying on green tea alone.
Does green tea speed up metabolism?
Green tea may increase metabolic rate very slightly — studies suggest around 3–5% boost — but this translates to only 10–20 extra calories burned per day. Diet and physical activity are far more significant factors in weight loss. Green tea's benefit, if any, is modest support within a calorie deficit, not a metabolism transformation.
Is it safe to drink green tea with GLP-1 weight loss injections?
Yes, green tea is safe alongside Mounjaro, Wegovy, or other GLP-1 medications. However, be mindful of total caffeine intake — GLP-1 medications can sometimes cause nausea, and excess caffeine may worsen this. Stick to 2–3 cups daily and monitor how you feel. Always discuss caffeine use with your prescriber.
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.