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
Free tracker included with every download this week
Understanding Obesity in Men — UK Health Context
If you've been told you're obese or your BMI falls above 30, understanding what this means for your health is an important first step. Obesity in men increases the risk of several serious health conditions, but the good news is that even modest weight loss can significantly improve health outcomes. This guide explains the health context, NHS support available, and evidence-based options for men looking to manage their weight in the UK.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Health Conditions Linked to Excess Weight in Men
Men with obesity face increased risk of several significant health conditions. Type 2 diabetes is one of the most common — men with severe obesity are up to 80 times more likely to develop type 2 diabetes than men at a healthy weight. Cardiovascular disease including heart attack and stroke is also substantially elevated, as excess weight increases blood pressure and affects cholesterol levels. Research shows an obese BMI UK threshold (30 and above) correlates with higher heart disease risk.
Other weight-related health risks include sleep apnoea (pauses in breathing during sleep), non-alcoholic fatty liver disease, and increased risk of certain cancers including prostate, bowel, and liver cancer. Waist measurement health risk is also important — men with a waist circumference over 102cm (40 inches) face significantly elevated cardiovascular risk, independent of BMI alone. The good news: losing even 5–10% of body weight can meaningfully reduce these risks.
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.
Support and Options Available to You
The NHS offers a structured weight management pathway. If you're concerned about your weight or have related health conditions, your GP can refer you to local weight management services, which provide diet advice, activity support, and behavioural coaching. For eligible men with overweight BMI or obesity plus health conditions like type 2 diabetes or high blood pressure, prescription weight loss treatment may be available through NHS specialist services, though waiting lists vary significantly by region.
You can start immediately by using our free BMI calculator above to confirm your personal BMI, then speak with your GP about next steps. Many men also find success with supported lifestyle changes — a reduced-calorie diet (approximately 500 kcal deficit daily) combined with increased physical activity can result in sustainable weight loss of around 0.5–1 kg per week. Track your progress using our free progress tracker to stay motivated.
- 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 BMI counts as obese for men in the UK?
According to NHS guidelines, a BMI of 30 and above is classified as obese. Use our free BMI calculator to find your personal BMI instantly. For men of South Asian, Chinese, or Black African heritage, the NHS recommends slightly lower thresholds (27.5+) due to higher health risk at lower BMI levels.
Can I check if I'm overweight without calculating BMI?
Yes — waist measurement is also important. Men with a waist circumference over 80cm face increased risk; over 94cm indicates substantially elevated cardiovascular risk. However, our BMI calculator and weight converter tools provide complete context for understanding your personal health profile.
What's the difference between obese and am I overweight?
The NHS overweight threshold is a BMI of 25–29.9, while obesity starts at 30. "Am I overweight" is a broader question — use our BMI calculator to check your specific category. Weight, height, age, ethnicity, and fitness level all affect health risk.
Are there prescription options for obese men in the NHS?
Yes — men with obesity (BMI 30+) or overweight with weight-related health conditions may be eligible for prescription weight loss injections like Mounjaro or Wegovy through NHS specialist tier 3 weight management services. Eligibility and availability vary significantly by region; ask your GP about referral options.
How much weight loss makes a real health difference?
Research shows that losing just 5–10% of body weight can reduce diabetes risk, lower blood pressure, and improve cardiovascular health. A 10kg loss for a man weighing 100kg is meaningful and achievable with lifestyle changes or, for eligible men, prescription support alongside diet and activity.
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.