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
Green Tea in Weight Loss — What the Evidence Shows
Green tea is often promoted as a weight loss aid, but the evidence is modest. While some studies suggest green tea may support modest weight loss through its catechin content, the effect is small and works best alongside a reduced-calorie diet and increased physical activity. For adults looking to lose weight in the UK, prescription weight management options like Mounjaro and Wegovy offer clinically proven support — particularly for those with a BMI of 27 or above. This guide explores what green tea can realistically offer and the prescription weight loss medication alternatives available through NHS and private routes.
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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
If you're looking for effective weight management in the UK, prescription medications offer stronger evidence than supplements alone. Mounjaro (tirzepatide) and Wegovy (semaglutide) are dual GIP and GLP-1 receptor agonist medications that have demonstrated significant weight loss results in clinical trials — averaging 15–clinically studied weight loss with Mounjaro and around 15% with Wegovy, depending on dose.
- Mounjaro: Once-weekly injection, doses 2.5 mg to 15 mg, maximum average weight loss ~21%
- Wegovy: Once-weekly injection, doses 0.25 mg to 2.4 mg, maximum average weight loss ~15%
- Saxenda (liraglutide): Daily injection, doses 0.6 mg to 3 mg, for adults with BMI ≥30 or ≥27 with weight-related health conditions
These medications work alongside lifestyle changes — diet and exercise remain essential. Individual results vary significantly, and a prescriber will assess whether medication is appropriate for your health profile.
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 Next Steps
NHS route: Prescription weight loss medications are available through NHS specialist tier 3 weight management services. Most GPs can refer you, though access and waiting times vary significantly by region and ICB. Some areas have substantial waiting lists.
Private route: If NHS waiting times are long, you can access prescription weight loss medication privately through a UK-licensed online prescriber following a clinical assessment. This is faster but involves a cost.
To find out if you're eligible, use our free BMI calculator above to check your current BMI, then speak with your GP about referral options or explore private prescribing. Your GP can also advise on whether prescription medication is right for you, or whether lifestyle changes and support services may be a better first step.
- 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 with weight loss?
Green tea contains catechins that may support modest weight loss — research suggests approximately 1–2 kg loss over 12 weeks when combined with reduced calories and exercise. However, the effect is small and much less significant than prescription weight loss medications. Green tea is best viewed as a healthy addition to an overall approach, not a weight loss solution on its own.
What's the difference between Mounjaro and Wegovy for weight loss?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. In clinical trials, Mounjaro showed slightly higher average weight loss (~21% vs ~15%), but both are effective. Individual results vary. Both are once-weekly injections. A prescriber can help you decide which is most suitable based on your health profile.
Am I eligible for prescription weight loss medication on the NHS?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with at least one weight-related health condition (such as type 2 diabetes, high blood pressure, or sleep apnoea). Eligibility is assessed individually by your GP or specialist. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds apply. Contact your GP to discuss referral.
How can I check my BMI and weight loss eligibility?
Use our free BMI calculator above to determine your BMI instantly. If your BMI is 27 or above, or you have weight-related health conditions, speak with your GP about whether prescription weight management medication might be suitable for you. Your GP can then refer you to specialist services or discuss private prescribing options.
How long does it take to see results with prescription weight loss medication?
Most people begin to see weight loss within 4–6 weeks, though results are gradual. Medications are typically titrated (doses increased gradually) over several months to reach the effective dose. Weight loss continues over months, with the most significant losses seen in the 6–12 month period. Everyone responds differently, so individual timelines vary.
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.