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
Detox Tea and Weight Loss: What Works in the UK?
Detox tea is popular, but there's limited scientific evidence that it causes weight loss. While some herbal teas may support general health, sustainable weight management typically requires dietary changes and increased physical activity. For adults struggling with weight management in the UK, prescription weight loss medication offers evidence-based support. This guide explains detox tea claims and explores NHS-licensed prescription options available to eligible adults.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 uk support, prescription medications are available for eligible adults in the UK. Three main options are licensed: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). Mounjaro and Wegovy are once-weekly injections, while Saxenda is a daily injection.
Clinical trials show these GLP-1 weight loss medications may help adults lose an average of 15–21% of their body weight when combined with a reduced-calorie diet and physical activity. Eligibility typically requires a BMI of 30 kg/m² or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes or high blood pressure.
Unlike detox teas, prescription weight loss medication works by affecting appetite hormones and how your body processes food. A prescriber will assess whether you're suitable following a clinical assessment.
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: Which Route Is Right for You?
In the UK, you can access prescription weight loss medication through the NHS or privately. NHS access is through specialist tier 3 weight management services, typically by GP referral. Availability varies significantly by region, and waiting lists can be lengthy.
Private access is available through UK-licensed online prescribers and GPhC-registered pharmacies. This route doesn't require NHS referral and can be faster, though costs apply—typically £129–£320 monthly depending on dose.
Whichever route you choose, speak to your GP first about whether prescription weight loss medication is appropriate for your individual circumstances. They can also advise on NHS eligibility in your area.
- 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 detox tea actually help you lose weight?
There's no strong scientific evidence that detox tea causes weight loss. While some herbal ingredients may have minor health benefits, weight loss requires a sustained calorie deficit. Detox teas don't address the underlying dietary and lifestyle changes needed for sustainable weight management.
What is GLP-1 weight loss medication and how does it work?
GLP-1 medications like Wegovy and Mounjaro are prescription injections that mimic a natural hormone affecting appetite and blood sugar. They may help reduce food cravings and support feeling fuller after meals. They're used alongside diet and exercise changes, not instead of them.
Am I eligible for prescription weight loss medication on the NHS?
You may be eligible if you have a BMI of 30 kg/m² or above, or 27–29.9 with weight-related conditions like type 2 diabetes or high blood pressure. Eligibility is assessed by your GP or a specialist weight management service. Availability and criteria vary by region.
What's the difference between Mounjaro and Wegovy?
Both are once-weekly injections licensed for weight management in the UK. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials show both support meaningful weight loss—individual results vary and prescriber assessment is needed.
How quickly can I expect to see weight loss results?
With prescription GLP-1 medication, weight loss typically becomes noticeable within 4–8 weeks, with ongoing loss over months. The NHS recommends losing 0.5–1 kg per week for sustainable results. You can track your progress with our free progress tracker to monitor your journey alongside lifestyle changes.
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.