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
Weight Loss Groups in the UK — Your Guide to Support and Options
Weight loss groups offer structured support, accountability, and shared experience for people trying to lose weight. In the UK, you can access free NHS weight loss programmes, community groups, and private weight management services. Whether you're looking for in-person meetings, online communities, or medical support with prescription weight loss medication, there are multiple pathways available. This guide explores the main weight loss groups and resources available across the UK to help you find the right support for your journey.
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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.
Types of Weight Loss Groups and Programmes Available in the UK
NHS Weight Management Services are provided through tier 1 and tier 2 programmes, including the NHS Weight Loss Plan — a free 12-week digital programme available to adults across England. The NHS also runs specialist weight management services (tier 3) which offer intensive support, behaviour change coaching, and access to prescription weight loss medication. These are typically available through your GP referral, though waiting lists vary significantly by region.
- Community and Voluntary Groups: Slimming World, Weight Watchers, and similar organisations offer regular meetings, group weigh-ins, and peer support. These are subscription-based but widely available across the UK.
- Online Communities: Reddit communities, Facebook groups, and dedicated weight loss forums provide 24/7 peer support and accountability without attending meetings.
- Prescription Weight Loss Support: For those with BMI ≥30 or ≥27 with weight-related health conditions, prescription weight loss medication such as GLP-1 injections (Wegovy or Mounjaro) may be available through NHS specialist services or private prescribing, always alongside lifestyle support.
Many people combine multiple approaches — for example, using a weight loss group for accountability whilst also using our free GLP-1 weight loss calculator to track progress with medication, or monitoring BMI changes using our BMI calculator.
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.
How to Choose the Right Weight Loss Group for You
The right weight loss group depends on your preferences, budget, and health situation. If you prefer free options: start with your GP, who can refer you to NHS weight management services or provide guidance on accessing the NHS Weight Loss Plan online. If you want group accountability: community organisations like Slimming World or Weight Watchers offer regular meetings and weigh-ins. If you need medical support: ask your GP about tier 3 specialist services where you can access prescription weight loss medication alongside structured support.
Whichever option you choose, sustainable weight loss typically requires a reduced-calorie diet, increased physical activity, and consistent tracking. Use our free progress tracker to log your weight loss journey alongside your chosen group, or try our weight converter to monitor changes across stone, kilograms, and pounds. Most groups recommend losing 0.5–1 kg per week — a safe, achievable rate recommended by the NHS.
- 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's the best free weight loss group in the UK?
The NHS Weight Loss Plan is completely free and available to adults across England as a 12-week digital programme. Your GP can also refer you to local NHS weight management services. Both offer evidence-based support at no cost, making them the most accessible option for most people.
Are weight loss groups effective?
Research shows that group-based weight loss programmes are effective because they provide accountability, peer support, and behaviour change coaching. Studies suggest group programmes achieve average weight loss of 3–5 kg over 12 weeks. Effectiveness increases when combined with dietary changes and activity increases.
Can I get prescription weight loss medication through a weight loss group?
Prescription weight loss medication like Wegovy or Mounjaro is not prescribed by weight loss groups themselves. You need to access it through your GP (via NHS specialist services) or through a private online prescriber following a clinical assessment. Many weight loss groups complement medication by offering lifestyle and behaviour support.
How do I join an NHS weight loss programme?
Start by speaking to your GP, who can refer you to local NHS weight management services (tier 2 or 3). You can also access the free NHS Weight Loss Plan directly online without a GP referral — it's available to adults in England. Waiting times vary by region, but referral is always free.
Can weight loss groups help with weight management UK-wide?
Yes, weight loss support is available across the entire UK. NHS services are available in England, Scotland, Wales, and Northern Ireland (though eligibility and availability vary). Commercial groups like Slimming World and Weight Watchers operate nationwide, and online communities are available everywhere with internet access.
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.