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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Tea for Weight Loss — What the Evidence Shows
While certain teas like green tea and oolong may support weight management through modest metabolic effects, they work best as part of a broader approach to healthy weight loss. If you're looking to lose weight in the UK, it's worth understanding both natural options and prescription weight loss medication available to eligible adults. This guide explores what the science says about tea, plus evidence-based prescription options like Mounjaro and Wegovy that your GP can discuss with you.
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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.
Tea and Weight Management — What Research Shows
Green tea and oolong tea contain compounds called catechins and caffeine that may boost metabolism slightly and support fat oxidation. Clinical studies suggest modest effects — typically 1–3kg weight loss over 12 weeks when combined with diet and exercise, though results vary significantly between individuals.
Black tea and herbal infusions may offer additional benefits through polyphenols and antioxidants, contributing to overall health rather than dramatic weight loss. Tea alone is not a weight loss solution — sustainable results require a calorie deficit alongside physical activity.
For meaningful weight loss in the UK, prescription medications including Mounjaro (tirzepatide) and Wegovy (semaglutide) have stronger evidence bases. In clinical trials, these GLP-1 and dual GIP/GLP-1 receptor agonist injections helped adults lose an average of 15–21% of body weight when combined with reduced-calorie diet and increased physical activity. Try our free GLP-1 weight loss calculator to explore projected results at different doses if you're eligible.
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
UK Prescription Weight Loss Options — If You're Eligible
If you have a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea), you may be eligible for prescription weight loss treatment through the NHS or private prescribing.
Mounjaro (tirzepatide) and Wegovy (semaglutide) are both licensed in the UK for weight management. Both require a clinical assessment before prescription and are used alongside lifestyle changes — not instead of them. NHS access is through specialist tier 3 weight management services, though waiting lists vary by region. Private prescribing is available through GPhC-registered online services.
Your GP can assess whether you're eligible and discuss which option might suit your health profile. Use our free BMI calculator above to check your starting point, and our weight converter to track progress in your preferred units.
- 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.
Does tea really help you lose weight?
Green and oolong teas may provide modest metabolic support (1–3kg over 12 weeks in studies), but they're most effective as part of a broader weight loss approach including calorie deficit and physical activity. Results vary between individuals, and tea alone is not a weight loss solution.
What prescription weight loss medication is available in the UK?
Mounjaro (tirzepatide) and Wegovy (semaglutide) are both UK-licensed GLP-1/GIP receptor agonist injections for weight management. Saxenda (liraglutide) is also available but requires daily injections. All require a prescription and clinical assessment based on BMI and health status.
How much weight can you lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% of body weight over 68–72 weeks on these medications. Individual results vary significantly. Weight loss is greatest when combined with a reduced-calorie diet and increased physical activity, and requires ongoing medication to maintain results.
How do I find out if I'm eligible for prescription weight loss treatment?
You're typically eligible if your BMI is 30 or above, or 27–29.9 with weight-related health conditions such as diabetes or high blood pressure. Speak to your GP about referral to specialist weight management services, or consult a private prescriber for assessment. Use our BMI calculator to check your current BMI.
Can I get weight loss medication through the NHS?
Yes, if eligible and referred to a tier 3 specialist weight management service. However, NHS waiting lists vary significantly by region and can be lengthy. Private prescribing through GPhC-registered online services is also available and often faster, though there's a cost involved.
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.