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
Which Green Teas Are Best for Weight Loss?
Green tea contains compounds like catechins and caffeine that may offer modest metabolic support, but clinical evidence for weight loss is limited. While green tea can be part of a healthy lifestyle, it is not a weight management solution on its own. If you're looking for effective weight loss support in the UK, prescription options like Mounjaro and Wegovy are available for eligible adults following clinical assessment. This guide explains both supplement approaches and proven prescription alternatives.
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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.
Prescription Weight Loss Options in the UK
For adults looking for evidence-backed weight management in the UK, three prescription medications are currently licensed:
- Mounjaro (tirzepatide) — dual GIP and GLP-1 injection, once weekly, doses from 2.5 mg to 15 mg. Clinical trials showed average weight loss of 15–21% body weight over 72 weeks when combined with diet and exercise.
- Wegovy (semaglutide) — GLP-1 injection, once weekly, maximum dose 2.4 mg. STEP trial data showed average weight loss of approximately 15% body weight at 68 weeks alongside lifestyle changes.
- Saxenda (liraglutide) — GLP-1 injection, once daily, maximum dose 3 mg. Also evidence-backed for weight loss support.
All three require a prescription and clinical assessment. Eligibility typically includes adults with BMI 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure.
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 and Getting Started
NHS access: Weight loss medication is available through specialist tier 3 weight management services, but availability and waiting times vary significantly by region. Your GP can refer you to your local service.
Private access: Available through UK-licensed online prescribers following a clinical assessment, typically without NHS referral. Costs vary by dose and provider.
If you're exploring weight loss options, use our free GLP-1 weight loss calculator to estimate potential results at different doses, and discuss eligibility with your GP or a licensed prescriber to find out which option suits you best.
- 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 green tea actually help with weight loss?
Green tea contains catechins and caffeine, which may offer a small metabolic boost of around 3–5% in some studies. However, clinical evidence for significant weight loss is limited. It can support a healthy lifestyle but is not a weight loss solution on its own. Combined with diet and exercise, it may provide minor benefits.
What's the difference between green tea and prescription weight loss medication?
Green tea is a supplement with modest, unproven effects. Prescription medications like Mounjaro and Wegovy are clinically tested and licensed by the MHRA. Clinical trials show they produce 15–21% average weight loss when combined with lifestyle changes. Prescription options require a clinical assessment and GP involvement.
Who is eligible for prescription weight loss medication in the UK?
Adults with a BMI of 30 kg/m² or above are typically eligible. Those with a BMI of 27–29.9 may also qualify if they have a weight-related health condition such as type 2 diabetes, high blood pressure, or sleep apnoea. Individual eligibility is assessed by a GP or licensed prescriber.
Can I access weight loss medication through the NHS?
Yes, weight loss medications are available through NHS specialist weight management services (tier 3). However, availability and waiting times vary by region. Ask your GP for a referral to your local service. Private prescribing is also available without NHS referral if you meet clinical eligibility criteria.
Are green tea supplements safe to use with weight loss medication?
Green tea is generally safe, but if you're taking prescription weight loss medication, always inform your prescriber about all supplements and herbal products you're using. Your prescriber can advise on any potential interactions and whether supplements are appropriate alongside your treatment plan.
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.