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 Plan For Men: UK Prescription Options
A structured weight loss diet plan for men works best when combined with professional support. In the UK, eligible men can access prescription weight loss medication alongside dietary changes through the NHS or private prescribing services. This guide covers evidence-based approaches to weight management, including medication options, who qualifies, and how to get started. Understanding your BMI, calorie needs, and available medical support can significantly improve your chances of achieving sustainable weight loss.
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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 Medications For Men
Three prescription-only medications are currently licensed in the UK for weight management in men: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These are GLP-1 or dual GIP/GLP-1 receptor agonist medicines that work by helping regulate appetite and food cravings.
Mounjaro (once-weekly injection) showed average weight loss of 15–21% of body weight in clinical trials at maximum dose. Wegovy (once-weekly injection) demonstrated approximately 15% average body weight loss in trials. Saxenda (daily injection) typically supports 5–clinically studied weight loss.
Eligibility in the UK generally requires: BMI of 30 or above, OR BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Individual results vary significantly, and medication works most effectively when combined with reduced-calorie diet and increased physical activity. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses.
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
NHS route: Speak to your GP about referral to a tier 3 specialist weight management service. NHS prescription weight loss medication is available but access varies by region and waiting times can be lengthy. Your GP will assess your BMI and any weight-related health conditions.
Private route: Licensed online prescribing services provide consultations with UK-qualified prescribers. If clinically appropriate, you receive a prescription dispensed by a GPhC-registered pharmacy. This route is faster but involves private costs (typically £129–£320 monthly depending on dose).
Whichever route you choose, a prescriber will assess whether medication is suitable based on your personal health. Weight loss injections are not a substitute for diet and exercise — they work alongside lifestyle changes. Check your BMI using our BMI calculator to see if you meet the initial eligibility threshold, then discuss options with your GP.
- 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 best weight loss diet plan for men in the UK?
There is no single "best" diet — sustainable weight loss comes from a calorie deficit of around 500 kcal daily, combined with physical activity and behaviour change. The NHS recommends losing 0.5–1 kg per week. Mediterranean diet, intermittent fasting, and low-carb approaches all have evidence. A GP or registered dietitian can help tailor a plan to your preferences and health.
Can men get prescription weight loss medication on the NHS?
Yes, if eligible. Men with BMI 30+ (or 27+ with weight-related conditions like diabetes) can be referred to NHS specialist weight management services for prescription medication assessment. However, NHS availability varies significantly by region and waiting lists are common. Your GP can discuss local options.
How much weight can men lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% with Mounjaro and approximately 15% with Wegovy at maximum doses over 12–18 months. However, individual results vary widely — some men lose more, others less. Weight loss occurs alongside a reduced-calorie diet and increased physical activity, not through medication alone.
What is my BMI and should I consider weight loss medication?
Use our free BMI calculator on this page to determine your personal BMI. If it's 30 or above, or 27–29 with weight-related health conditions, you may be eligible for prescription weight loss medication. However, a GP or prescriber must assess your full health picture before recommending treatment.
How do I know if weight loss medication is right for me?
A licensed prescriber will evaluate your medical history, current medications, weight-related health conditions, and lifestyle. Prescription weight loss medication is not appropriate for everyone and works best when combined with dietary changes and exercise. Always have an honest conversation with your GP about your weight loss goals and 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.