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 for Men: Evidence-Based Strategies in the UK
Weight loss for men in the UK can be achieved through sustainable lifestyle changes, NHS support, and prescription medication where appropriate. Men typically carry weight differently than women, and understanding your personal BMI and health context is the first step toward lasting weight management. This guide covers evidence-based approaches available to UK men, from diet and exercise to GLP-1 weight loss injections and NHS services.
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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.
How Men Can Lose Weight Sustainably
The NHS recommends losing weight at a rate of 0.5 to 1 kg per week for sustainable results. This typically requires a calorie deficit of around 500 kcal per day, which can be achieved through reduced-calorie eating and increased physical activity. Research shows that men often respond well to structured, goal-focused approaches to weight loss.
- Calculate your personal BMI using our free BMI calculator to understand your starting point
- A calorie deficit of 500 kcal/day typically results in approximately 0.5 kg weekly loss
- Combine dietary changes with regular physical activity for best results
- NHS weight management programmes are available through your GP — access varies by region
- Track your progress consistently using our free progress tracker to stay motivated
Men with a BMI of 30 or above, or 25–29.9 with weight-related health conditions, may be eligible for prescription weight loss treatment through NHS specialist services or private prescribing.
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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.
Prescription Weight Loss Options for Men
GLP-1 weight loss injections are prescription-only medications that can support weight management when combined with lifestyle changes. Wegovy (semaglutide) is a once-weekly GLP-1 injection licensed in the UK for adults meeting NHS weight loss criteria. Clinical trials showed participants lost an average of around 15% of body weight, though individual results vary significantly.
Mounjaro (tirzepatide) is a dual GLP-1 and GIP receptor agonist also licensed for UK weight management, with SURMOUNT trial data showing average losses of 15–21% depending on dose. Both medications require a prescription following clinical assessment by a GP or licensed prescriber. Try our GLP-1 weight loss calculator to explore potential outcomes at different doses alongside your lifestyle changes.
Access to prescription weight loss treatment in the UK comes through two routes: NHS specialist tier 3/4 weight management services (referral through your GP, availability varies by region) or private online prescribing (following an online clinical assessment with a UK-licensed prescriber). Waiting lists for NHS services can be lengthy in many areas. Both routes require a thorough health assessment to ensure the medication is safe and appropriate for you personally.
- 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 healthiest rate of weight loss for men?
The NHS recommends losing 0.5 to 1 kg per week as a sustainable, safe rate. Faster weight loss risks muscle loss and is difficult to maintain long-term. This pace typically requires a calorie deficit of around 500 kcal daily through diet and exercise combined.
Can men use GLP-1 weight loss injections like Wegovy or Mounjaro?
Yes. Wegovy and Mounjaro are prescription-only medications available to both men and women in the UK who meet eligibility criteria (BMI 30+ or 27+ with weight-related health conditions). Both require a prescription and clinical assessment. Individual results vary.
How do I access NHS weight loss support in the UK?
Start by speaking with your GP, who can assess your health and refer you to tier 3 specialist weight management services if appropriate. Availability and waiting times vary significantly by region. Services typically include behaviour change support, dietitian advice, and consideration of prescription medication where indicated.
What is the difference between Wegovy and Mounjaro?
Both are once-weekly injections for weight management. Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist. Clinical trials showed both support weight loss when combined with diet and exercise; results vary between individuals.
Can I lose weight without medication?
Yes. Sustainable weight loss is possible through a balanced reduced-calorie diet and increased physical activity. The NHS recommends this approach first. Prescription medications are typically considered after lifestyle changes alone, or alongside them, based on individual health circumstances and GP assessment.
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.