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 — A Practical UK Health Guide
Weight loss for men in the UK starts with understanding your personal health baseline. Whether you're looking to improve your health, manage a weight-related condition, or simply feel better, sustainable weight loss requires a combination of realistic goals, lifestyle changes, and sometimes medical support. The NHS recommends losing weight gradually at a rate of 0.5 to 1 kg per week, and offers several evidence-based approaches to help. Start by checking your BMI using our free BMI calculator above to understand where you currently stand against NHS healthy weight guidelines.
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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
Sustainable weight loss for men involves creating a modest calorie deficit alongside increased physical activity. The NHS weight management pathway begins at Tier 1 with self-help tools and community support, progressing to specialist services if needed. A deficit of around 500 kcal per day typically results in losing approximately 0.5 kg per week — this is considered safe and sustainable for most men.
- Dietary changes: reduce processed foods, increase protein and fibre, control portion sizes
- Physical activity: combine aerobic exercise (brisk walking, cycling) with resistance training to preserve muscle mass during weight loss
- Behavioural support: many men benefit from structured programmes or accountability methods
- Medical support: if self-directed approaches haven't worked, your GP can refer you to NHS Tier 2 or Tier 3 services
For men with a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes or high blood pressure, prescription weight loss medication may be an option alongside lifestyle changes. GLP-1 weight loss injections like Wegovy are available through both NHS specialist services and private prescription in the UK.
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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.
Weight Loss Medication for Men in the UK
If diet and exercise alone haven't achieved results, men may be eligible for prescription weight loss medication through NHS specialist weight management services or private prescribing. Wegovy (semaglutide) is a once-weekly GLP-1 injection licensed for weight management in UK adults — clinical trials showed average weight loss of around 15% of body weight, though individual results vary significantly.
Other options include Mounjaro (tirzepatide), a dual GIP and GLP-1 injection, which showed average weight loss of 15–21% in clinical trials. Both are prescription-only and require a clinical assessment to confirm eligibility and suitability. Try our free GLP-1 weight loss calculator to understand how these medications might support your weight loss goals. Weight loss medications work best alongside continued dietary improvements and increased activity — they are not replacements for lifestyle change.
- 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 a realistic weight loss target for men?
The NHS recommends losing 0.5 to 1 kg per week for sustainable, healthy weight loss. Losing faster can result in muscle loss and is harder to maintain long-term. A 5–10% reduction in body weight produces meaningful health benefits even before reaching a "healthy" BMI.
Can I get weight loss medication on the NHS?
Yes. Men with a BMI of 30 or above, or 27–29.9 with weight-related conditions, may be eligible through NHS Tier 3 specialist weight management services. Availability and waiting times vary by region. Ask your GP for a referral to local services.
What's the difference between Wegovy and Mounjaro?
Both are prescription-only weekly injections licensed for weight management in the UK. Wegovy (semaglutide) is a GLP-1 agonist; Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist. Average weight loss is slightly higher with Mounjaro (15–21% vs 15%), but individual results vary. A prescriber will assess which is suitable for you.
Do I need to exercise to lose weight with medication?
Weight loss medications work best alongside lifestyle changes. Clinical trials combined medication with reduced-calorie diet and increased physical activity. Exercise helps preserve muscle mass during weight loss and provides independent health benefits beyond weight reduction.
How do I know if I'm overweight?
Use our free BMI calculator above to check your personal BMI instantly. For men, a BMI under 25 is considered healthy weight, 25–29.9 is overweight, and 30 or above is obese according to NHS guidelines. Your GP can discuss what your BMI means for your individual health.
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.