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 Diet For Men: UK Medication & NHS Options
Weight loss for men in the UK involves more than just diet — prescription medications can now support your efforts if you're eligible. This guide covers UK-licensed weight management options, how NHS weight loss services work, and what to expect if you're considering prescription treatment alongside lifestyle changes. We'll help you understand eligibility criteria and how to start a conversation with your GP.
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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.
UK-Licensed Prescription Weight Loss Options
Three prescription medications are licensed in the UK for weight management in adults, including men with a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea.
Mounjaro (tirzepatide) is a once-weekly injection that activates two hormone pathways (GIP and GLP-1), helping reduce appetite and support feeling fuller after meals. Clinical trials showed men using Mounjaro lost an average of 15–21% of their body weight over 72 weeks alongside a reduced-calorie diet and increased physical activity.
Wegovy (semaglutide) is another once-weekly GLP-1 injection with similar mechanisms. The STEP-1 trial reported average weight loss of approximately 15% body weight at the maximum dose. Both medications work best when combined with dietary changes and exercise, not as replacements for them.
Saxenda (liraglutide) is a daily injection option, though less commonly prescribed than Mounjaro or Wegovy in current UK practice.
All three are prescription-only medicines requiring clinical assessment before being prescribed. Individual results vary significantly.
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.
NHS vs Private Access: How to Get Started
In the UK, you can access prescription weight loss medication through two routes.
- NHS: Referral to a tier 3 specialist weight management service through your GP. Availability and waiting times vary significantly by region — some areas have months-long waiting lists. Your GP can discuss eligibility and local options.
- Private: Online consultation with a UK-licensed prescriber followed by prescription through a GPhC-registered pharmacy. No NHS referral needed, but you pay privately (typically £150–£300 per month depending on dose).
Regardless of route, a prescriber will assess your personal health, weight history, and any underlying conditions before prescribing. Use our free BMI calculator to check your BMI and understand where you fall relative to eligibility thresholds. If you're interested in projected outcomes, our GLP-1 weight loss calculator can show potential results at different doses.
- 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.
Can I use prescription weight loss medication without changing my diet?
No. Prescription medications like Mounjaro and Wegovy work most effectively alongside a reduced-calorie diet and increased physical activity. They support appetite control and feeling fuller, but sustainable weight loss requires dietary and lifestyle changes. Your GP or prescriber will discuss this.
What BMI do I need to be eligible for weight loss medication in the UK?
You're eligible if your BMI is 30 or above, or 27–29.9 with at least one weight-related health condition (type 2 diabetes, high blood pressure, sleep apnoea, or cardiovascular disease). For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds apply. Use our free BMI calculator to check your personal BMI.
How much weight can men realistically lose with prescription medication?
Clinical trials show average weight loss of 15–21% body weight over several months, but individual results vary significantly. Some men lose more, some less. Results depend on starting weight, dose, diet adherence, physical activity, and individual metabolism. Your prescriber can discuss realistic expectations for your situation.
How long do I need to take weight loss medication?
Duration varies. Some people use medication for several months as part of an intensive weight management programme. Others continue longer-term. Your prescriber will assess your progress and discuss how long treatment is appropriate for you, typically reviewing this every 3–6 months.
Is weight loss medication covered by the NHS for men?
NICE has approved tirzepatide (Mounjaro) and semaglutide (Wegovy) for NHS use within specialist weight management services. However, NHS access is through tier 3 services (not your GP directly), and availability varies significantly by region. Ask your GP about local NHS weight management services and waiting times.
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.