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 Methods in the UK — Complete Guide
There are several effective weight loss methods available in the UK, ranging from lifestyle changes and dietary approaches to prescription medication. The most successful weight management strategies typically combine multiple approaches — dietary changes, increased physical activity, and behavioural support. The NHS recommends sustainable weight loss of 0.5 to 1 kg per week, and many people benefit from combining these methods based on their individual health needs and circumstances. This guide covers the evidence-based approaches available 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.
Lifestyle and Dietary Approaches to Weight Loss
The foundation of sustainable weight management uk starts with lifestyle changes. A calorie deficit of around 500 kcal per day typically results in weight loss of approximately 0.5 kg per week. This can be achieved through diet, exercise, or a combination of both.
- Reduced-calorie diet: Eating 1200–1500 kcal per day (women) or 1500–1800 kcal per day (men) under GP guidance
- Mediterranean diet: Strong evidence for sustainability and cardiovascular health
- Low-carbohydrate approaches: Effective short-term; long-term results similar to standard calorie restriction
- Intermittent fasting (16:8 or 5:2): May support modest weight loss for some people
- Increased physical activity: 150 minutes moderate activity weekly supports both weight loss and health benefits
The NHS Weight Loss Plan offers free digital support. Your GP can refer you to local community weight management programmes, which provide structured support and behaviour change coaching.
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 Medication and NHS Support
For adults who haven't achieved results through lifestyle changes alone, prescription weight loss medication nhs services may be appropriate. GLP-1 receptor agonist medications like semaglutide (Wegovy) and tirzepatide (Mounjaro) are licensed in the UK and work alongside reduced-calorie diet and increased physical activity. These are available through NHS specialist tier 3 weight management services (referral from GP required) or through private online prescribing following clinical assessment.
Try our free GLP-1 weight loss calculator above to understand potential outcomes with prescription medication. Weight loss injections uk are prescription-only and require individual clinical assessment — not everyone is eligible, and results vary significantly. Bariatric surgery is also available through the NHS for severe obesity with significant health complications.
- 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 is the most effective weight loss method?
The most effective weight loss method is the one you can sustain long-term. Evidence shows calorie deficit (around 500 kcal daily) combined with increased physical activity produces sustainable results. For some people, prescription weight loss medication alongside lifestyle changes is most effective. Your GP can advise what's right for your situation.
How quickly can I lose weight safely?
The NHS recommends losing 0.5 to 1 kg per week as safe and sustainable. Faster weight loss can lead to muscle loss and nutritional deficiencies. Even a 5–10% reduction in body weight produces meaningful health benefits — you don't need to reach a "goal weight" to feel improvements.
What is glp-1 weight loss medication?
GLP-1 receptor agonist medications (like Wegovy) mimic a natural gut hormone that signals fullness and reduces appetite. They're prescription-only, used alongside diet and exercise, and available through NHS specialist services or private prescribing. Clinical trials showed average weight loss of around 15% with semaglutide.
Can I access weight loss medication through the NHS?
Yes. NHS weight loss medication is available through specialist tier 3 weight management services for adults with BMI ≥30 (or ≥27 with weight-related health conditions). Ask your GP for referral. Availability and waiting times vary significantly by region. Private prescribing is also available.
Is weight loss medication safe?
Prescription weight loss medications are safe when prescribed after proper clinical assessment. Like all medications, they can have side effects — nausea and digestive changes are common initially. Your prescriber will assess whether it's suitable for you and monitor your progress. Always report any concerns to your healthcare provider.
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.