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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Weight Loss Groups in London — Your Support Options
If you're looking to lose weight in London, you have several evidence-based options available. From NHS-funded community weight management groups to private prescription weight loss services, London offers diverse pathways to support sustainable weight loss. This guide covers the main weight loss groups and programmes available across the capital, plus how prescription weight loss medication and other weight management UK approaches can fit into your plan.
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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.
Weight Loss Groups Available in London
London residents can access weight loss support through several established routes:
- NHS Weight Management Services: Available through your GP, these tier 1 and tier 2 services offer behaviour change programmes, digital tools, and group support. Many London boroughs run free or low-cost weight management groups in community settings.
- Specialist Tier 3 Services: For those with a BMI of 30 or above, or 27–29.9 with weight-related health conditions, NHS specialist weight management services provide intensive multidisciplinary support. Access is through GP referral.
- Slimming World and Weight Watchers: Both operate multiple groups across London with weekly meetings, peer support, and structured diet frameworks.
- Private Weight Loss Clinics: London has numerous private weight management clinics offering personalised programmes, nutritionist support, and where appropriate, prescription weight loss medication including GLP-1 weight loss injections.
Using our free BMI calculator on this page can help you understand which tier of support may be most suitable for your current health status.
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.
Prescription Weight Loss Options in London
London residents with a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure, may be eligible for prescription weight loss medication through NHS specialist services or private prescribing. Medications such as GLP-1 weight loss injections (Wegovy and Mounjaro) work alongside a reduced-calorie diet and increased physical activity.
Our GLP-1 weight loss calculator can help you estimate potential outcomes at different doses. These prescription weight loss uk options require a clinical assessment from a licensed prescriber to confirm eligibility. London has excellent access to both NHS tier 3 services and private online prescribing—though NHS waiting lists can be lengthy in some areas. Always discuss your individual situation with your GP first.
- 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.
What weight loss groups can I join in London for free?
The NHS offers free weight management groups through most London boroughs. Ask your GP about tier 1 or tier 2 community programmes in your area. These are evidence-based behaviour change groups often held in health centres or community settings. Many run alongside digital tools and provide structured support without cost.
How do I access NHS specialist weight loss services in London?
Ask your GP for a referral to your local NHS tier 3 specialist weight management service. These provide intensive multidisciplinary support including dietitian input, psychology support, and where appropriate, prescription medication. Waiting lists vary by London borough, but referral is the standard pathway.
Is GLP-1 weight loss medication available on the NHS in London?
Yes, GLP-1 medications like Wegovy (semaglutide) and Mounjaro (tirzepatide) are available through NHS tier 3 specialist services, though access and waiting lists vary across London's different integrated care boards. Private access is also available through online prescribing.
What's the difference between Wegovy and Ozempic?
Both contain semaglutide, but Wegovy is the licensed weight management version (up to 2.4 mg once weekly), while Ozempic is approved for type 2 diabetes (up to 2 mg). Ozempic is not licensed for weight loss in the UK—Wegovy is the correct prescription option for weight management.
How do I know if I'm eligible for prescription weight loss treatment?
Generally, you're eligible if you have a BMI of 30 or above, or 27–29.9 with a weight-related health condition like high blood pressure or type 2 diabetes. Use our free BMI calculator to check your current BMI, then discuss eligibility with your GP or a prescriber through NHS or private services.
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.