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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How to have green tea for weight loss
Green tea can be part of a healthy weight management routine, but it works best alongside a reduced-calorie diet and physical activity. If you're looking to lose weight in the UK, you may also be interested in understanding what prescription options are available. This guide explains how to use green tea effectively and introduces you to evidence-based weight management approaches, including NHS-approved medications like Mounjaro and Wegovy for eligible adults. Whether you prefer natural methods, dietary changes, or prescription support, understanding all your options helps you make informed decisions about weight loss 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.
Green tea and weight loss: what the evidence shows
Green tea contains catechins, antioxidants that research suggests may slightly boost metabolism and fat oxidation. Studies show modest effects — typically a reduction of around 1–3 kg over several months when combined with a calorie deficit. Green tea alone is not a weight loss solution, but may support overall weight management when part of a broader lifestyle approach.
How to drink green tea for weight loss:
- Brew 3–4 cups daily (300–400ml total)
- Use water around 70–80°C (not boiling) to preserve catechins
- Steep for 3–5 minutes
- Drink between meals to avoid caffeine on an empty stomach
- Avoid adding sugar or honey — this negates weight loss benefits
Green tea works best when combined with a calorie deficit of around 500 kcal daily, which typically results in sustainable weight loss of 0.5–1 kg per week according to NHS guidance. However, for significant weight management, many people benefit from additional support — whether through structured diet, exercise, or prescription weight loss medication nhs services can provide.
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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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Prescription weight management options in the UK
If green tea and lifestyle changes aren't delivering the results you need, prescription weight loss injections are available in the UK for eligible adults. Mounjaro (tirzepatide) and Wegovy (semaglutide) are both GLP-1 weight loss medications licensed and approved in the UK. Mounjaro showed an average weight loss of around 15–21% of body weight in clinical trials, while Wegovy showed approximately 15% average weight loss — individual results vary significantly.
To find out if you're eligible for prescription weight loss medication:
- Check your BMI using our free BMI calculator above
- If your BMI is 30 or above (or 27+ with health conditions), you may be eligible
- Speak with your GP about NHS specialist weight management services, or explore private prescribing through a clinical assessment
- Use our GLP-1 weight loss calculator to see projected outcomes at different doses
- 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 3–4 cups (300–400ml) daily may have modest effects on metabolism. However, consistency matters more than quantity. Green tea works best alongside a calorie deficit and regular physical activity. Always consult your GP if you have caffeine sensitivity or take medications.
When is the best time to drink green tea for weight loss?
Drink green tea between meals to maximise catechin absorption and avoid caffeine on an empty stomach. Morning and early afternoon are ideal. Avoid late afternoon or evening consumption as caffeine may disrupt sleep — and poor sleep undermines weight loss efforts.
Can green tea alone help me lose weight?
No. Green tea provides only modest metabolic support — typically 1–3 kg loss over months. Sustainable weight loss requires a calorie deficit of around 500 kcal daily. Green tea works best as part of broader weight management, alongside diet and exercise, or combined with prescription options if you're eligible.
What's the difference between green tea weight loss and prescription medications?
Green tea has minimal effects (1–3 kg over months). Prescription GLP-1 medications like Mounjaro and Wegovy, available in the UK for eligible adults, show average weight loss of 15–21% of body weight. Both approaches work best with lifestyle changes, but prescription options provide significantly stronger clinical outcomes.
How do I know if I'm eligible for prescription weight loss medication in the UK?
You may be eligible if your BMI is 30 or above, or 27–29.9 with weight-related health conditions (diabetes, high blood pressure, heart disease). Check your BMI using our free calculator. Speak with your GP about NHS services, or contact a private prescriber for a clinical assessment — they will confirm your eligibility.
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.