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
How Does Green Tea Help With Weight Loss — And What Else Works Better
Green tea does contain compounds that may modestly support weight management, but its effects are relatively small compared to other proven methods. For UK adults struggling with excess weight, prescription weight loss medication alongside lifestyle changes offers significantly more effective results. This guide explains how green tea works, why it's limited, and what prescription weight management options are available through the NHS and privately in the UK.
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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 Available in the UK
For adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, prescription weight loss medication offers evidence-based support far more effective than supplements alone. The UK has three licensed options for weight management medication:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist, once-weekly injection. Clinical trials showed average weight loss of 15–21% over 72 weeks.
- Wegovy (semaglutide) — a GLP-1 receptor agonist, once-weekly injection. Evidence from trials demonstrated average weight loss of approximately 15% body weight.
- Saxenda (liraglutide) — a GLP-1 agonist, once-daily injection. A daily alternative for those preferring flexibility in timing.
All three are prescription-only medicines requiring clinical assessment by a licensed prescriber. Try our GLP-1 weight loss calculator above to see how these medications might work for your weight loss goals.
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 — What's Available to You
NHS access: Specialist tier 3 weight management services prescribe these medications following referral from your GP. Availability varies significantly by region, and waiting lists can be lengthy in many areas.
Private access: UK-licensed prescribers offer online consultations and issue prescriptions if clinically appropriate, dispensed by GPhC-registered pharmacies. This route doesn't require NHS referral and is immediately available, though costs apply (typically £129–£320+ monthly depending on dose).
Speak to your GP about eligibility — they can assess your BMI and health conditions, and either refer you to NHS specialist services or discuss private options. Use our BMI calculator above to check where your weight falls on the NHS health threshold scale.
- 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 really help you lose weight?
Green tea contains caffeine and catechins, which may slightly boost metabolism and fat burning. However, research shows the effect is modest — typically 1–3 kg over several months. For meaningful weight loss, green tea works best combined with a calorie deficit and exercise. Prescription weight loss medication produces significantly larger results for eligible adults.
How does green tea compare to GLP-1 weight loss medication?
Green tea may support a 1–2% body weight reduction, whilst GLP-1 medications like Wegovy and Mounjaro support 14–21% body weight reduction in clinical trials. GLP-1 medication is far more effective, though it requires a prescription, clinical assessment, and costs money. Green tea is a low-cost, natural supplement but has limited impact alone.
Can I get weight loss medication on the NHS in the UK?
Yes. If your BMI is 30 or above, or 27 or above with weight-related conditions like diabetes or high blood pressure, you may be eligible for prescription weight loss medication through NHS specialist weight management services. Ask your GP for a referral to tier 3 services in your area. Availability and waiting times vary by region.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist and typically produces slightly larger average weight loss (15–21%) than Wegovy (semaglutide), a single GLP-1 agonist (approximately 15%). Both are once-weekly injections. Individual results vary. A prescriber can discuss which is most appropriate for your health situation.
How quickly do prescription weight loss injections work?
Weight loss typically begins within the first few weeks, with most significant results after 12–16 weeks on an effective dose. However, these medications work best alongside a reduced-calorie diet and increased physical activity. Results vary between individuals — some people lose more weight than others even on the same dose.
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.