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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5 Ways To Increase Weight Loss On Wegovy
Wegovy (semaglutide) is a prescription-only weekly weight loss injection licensed in the UK, and clinical trials showed it can help people lose an average of around 15% of their body weight. However, the medication works best alongside specific lifestyle changes and healthy habits. This guide covers five evidence-based strategies to help you maximise your results with this weekly weight loss injection, whether you're accessing it through NHS specialist services or private prescription. Individual results vary significantly depending on factors like diet, physical activity, dose, and how long you've been taking the medication.
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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.
How Wegovy Works and Why Lifestyle Matters
Wegovy (semaglutide) is a GLP-1 receptor agonist — a medication that activates natural hormones in your gut to reduce appetite, increase feelings of fullness, and slow how quickly food leaves your stomach. The STEP clinical trials demonstrated weight loss benefits, but research also shows that medication alone is not sufficient for sustained results. Your prescriber will stress that Wegovy is designed to be used alongside a reduced-calorie diet and increased physical activity, not as a replacement for these. The medication removes some of the psychological and physiological barriers to eating less — cravings often reduce, portions feel satisfying smaller, and hunger signals diminish — but it does not do the work for you. This is why the five strategies below focus on combining medication with practical lifestyle changes. When taken at the maximum Wegovy dose (2.4 mg once weekly), the medication gives you a powerful tool, but your choices about food and movement determine whether you achieve meaningful, lasting weight loss.
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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.
Five Evidence-Based Strategies To Maximise Weight Loss Results
1. Maintain a consistent calorie deficit. The NHS recommends a deficit of around 500 kcal per day for sustainable loss of roughly 0.5 kg per week. Wegovy reduces hunger and cravings, making this easier, but tracking food intake — using apps or a food diary — helps ensure you stay in deficit without over-restricting. 2. Prioritise high-protein foods. Protein increases satiety, preserves muscle during weight loss, and has a higher thermic effect than carbohydrates. Aim for 25–30g protein per meal. 3. Stay hydrated and move daily. Drinking water reduces false hunger signals; combining regular activity (150 minutes moderate exercise weekly, per NHS guidelines) with Wegovy amplifies metabolic benefits. 4. Manage expectations around dose escalation. Wegovy doses increase every 4 weeks from 0.25 mg to 2.4 mg maximum. Some people see rapid early loss, others need time at higher doses — your GP or prescriber will monitor progress. 5. Address emotional eating and sleep. Poor sleep increases appetite hormones; stress and boredom trigger eating regardless of hunger. Addressing these through support, routine, or counselling enhances medication effectiveness.
- 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.
Is Wegovy available on the NHS in the UK?
Wegovy is available through NHS specialist (tier 3) weight management services in some areas, though access and waiting times vary significantly by region and integrated care board. Private prescription through a UK-licensed online prescriber is also available. Either route requires clinical assessment and is prescription-only — you cannot buy Wegovy without a valid prescription from a registered practitioner.
How does Wegovy compare to Mounjaro for weight loss?
Wegovy (semaglutide, GLP-1 agonist) and Mounjaro (tirzepatide, dual GIP+GLP-1 agonist) both help reduce appetite and support weight loss. Clinical trials showed Mounjaro achieved slightly higher average weight loss (~21% vs ~15% for Wegovy), but individual results vary greatly. Your prescriber will recommend the most suitable option based on your health profile, eligibility, and response.
What side effects might affect my weight loss progress on Wegovy?
Common side effects include nausea, diarrhoea, and reduced appetite — the reduced appetite actually supports weight loss, but nausea and stomach upset may reduce food intake unhelpfully. Most people find side effects reduce after a few weeks at each dose. If side effects persist, discuss with your GP or prescriber; they may adjust your dose or provide additional support.
How long does it take to see weight loss results on Wegovy?
Most people notice initial weight loss within the first 2–4 weeks as appetite reduces, though the rate varies. Dose escalation every 4 weeks continues to increase results for many people. Maximum benefit typically appears after 12–16 weeks at the 2.4 mg dose. Track progress using our free progress tracker to monitor changes beyond the scale, including energy levels and how clothes fit.
Can I use our GLP-1 weight loss calculator to estimate my potential results on Wegovy?
Yes — our free GLP-1 weight loss calculator can help you project potential weight loss at different doses based on clinical trial data. However, these are estimates only; actual results depend on your individual metabolism, adherence to dietary changes, activity level, and how your body responds. Your prescriber can give you more personalised guidance based on your health history and weight loss goals.
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.