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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Green Tea and Weight Loss — What Works in the UK
Green tea contains compounds like catechins and caffeine that may support weight management, but evidence for dramatic results is modest. If you're looking for more substantial weight loss support, the UK has several prescription options available. This guide explains how green tea fits into a weight management strategy, alongside evidence-based prescription medications and lifestyle changes that have shown stronger results in clinical trials.
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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.
UK-Licensed Prescription Weight Loss Options
For adults struggling with weight management uk, three prescription-only medications are licensed in the UK: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These are GLP-1 and GIP receptor agonists — injectable medications that reduce appetite and support feeling fuller after smaller meals. Clinical trials showed average weight loss of 15–21% body weight with Mounjaro and around 15% with Wegovy, making them significantly more effective than green tea alone.
Eligibility for prescription weight loss requires:
- BMI of 30 or above, OR
- BMI of 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease)
- For South Asian, Chinese, Black African, or Black Caribbean adults: lower thresholds may apply
You can check your BMI using our free BMI calculator above. Results vary between individuals, and these medications work best alongside a reduced-calorie diet and increased physical activity — similar to how green tea works as part of a broader healthy lifestyle.
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.
NHS vs Private Access for Weight Loss Medication
In the UK, prescription weight loss medication is available through two routes. NHS access requires referral to a tier 3 specialist weight management service — waiting lists vary by region and can be lengthy. Private access is available through GPhC-registered online clinics following a clinical assessment, typically within days.
Your GP can advise whether you're eligible and discuss which route suits you best. Nhs weight loss support also includes tier 1 and 2 interventions — digital tools, community programmes, and behaviour change support — all available free. Our free GLP-1 weight loss calculator can help you estimate potential outcomes if you're considering prescription options. Weight management is a marathon, not a sprint: combining green tea with structured support, whether NHS or private, gives you the best chance of sustainable results.
- 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.
Can green tea alone help me lose weight?
Green tea contains caffeine and catechins which may have a modest thermogenic effect, but clinical evidence shows the impact is small — typically contributing to less than 0.5 kg weight loss over several months. For more significant results, combining green tea with a reduced-calorie diet, exercise, and potentially prescription medication (if eligible) is far more effective.
How do I know if I'm eligible for prescription weight loss medication in the UK?
You're likely eligible if you have a BMI of 30 or above, or 27–29.9 with a weight-related health condition like type 2 diabetes or high blood pressure. Use our free BMI calculator on this page to check your BMI, then discuss eligibility with your GP or a licensed prescriber.
What's the difference between Mounjaro and Wegovy for weight loss in the UK?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist with clinical trial data showing ~15–21% average weight loss. Wegovy (semaglutide) is a GLP-1 agonist showing ~15% average weight loss. Both are prescription-only and require a clinical assessment. Results vary individually, and choice depends on prescriber recommendation.
Can I use green tea while taking Mounjaro or Wegovy?
Yes — green tea is safe alongside prescription weight loss medication. In fact, combining medication with healthy habits like drinking green tea, reducing calories, exercising, and staying hydrated maximises your chances of success. Always inform your prescriber of all supplements and dietary habits.
How do I access prescription weight loss medication through the NHS?
Ask your GP for a referral to your local tier 3 specialist weight management service. NHS access varies by region and waiting times differ. Alternatively, private GPhC-registered online clinics offer prescription options without NHS referral, typically within days of a clinical assessment.
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.