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, Boiled Eggs, and Prescription Medication Options in the UK
Boiled eggs are a popular choice for people managing their weight in the UK — they're protein-rich, affordable, and convenient. However, food choices alone often aren't enough for significant weight loss. This guide explains why boiled eggs can support a healthy diet, and introduces prescription weight management options available to eligible UK adults through the NHS and private prescribing. If you're looking at weight loss approaches, your GP can discuss both dietary strategies and medication that may help.
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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 Medication
For eligible adults, the NHS and private prescribers in the UK offer three prescription-only weight management medications:
- Mounjaro (tirzepatide) — a once-weekly injection that activates two hormone pathways (GIP and GLP-1). Clinical trials showed participants lost an average of 15–21% of their body weight over 72 weeks alongside lifestyle changes.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. STEP trial data showed average weight loss of approximately 15% body weight at maximum dose.
- Saxenda (liraglutide) — a once-daily GLP-1 injection with similar effectiveness to Wegovy.
All three medications work best when combined with a balanced diet — including protein-rich foods like boiled eggs — and increased physical activity. Individual results vary significantly. These are prescription-only medicines requiring clinical assessment before being prescribed.
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.
Eligibility and Next Steps in the UK
You may be eligible for prescription weight loss medication if you have a BMI of 30 or above, or BMI 27–29.9 with a weight-related health condition such as type 2 diabetes, high blood pressure, or cardiovascular disease. Lower thresholds apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage.
How to find out: Speak to your GP about NHS specialist weight management services in your area, or explore private prescribing through a GPhC-registered online pharmacy. Try our free BMI calculator and GLP-1 weight loss calculator to understand your starting point and projected outcomes. A licensed prescriber will assess whether medication is right for you.
- 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 boiled eggs alone help me lose weight?
Boiled eggs are high in protein and low in calories, so they can support a balanced diet. However, sustainable weight loss typically requires a calorie deficit achieved through overall dietary changes and increased activity. For many people, lifestyle alone isn't enough — prescription medication may help if you're eligible.
Is prescription weight loss medication available on the NHS in the UK?
Yes. Mounjaro, Wegovy, and Saxenda are available through NHS tier 3 specialist weight management services, though availability and waiting times vary by region. Your GP can refer you if you meet eligibility criteria. Private prescribing is also available through online pharmacies.
How much weight can I expect to lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% body weight (Mounjaro) and approximately 15% (Wegovy) over several months, alongside diet and exercise. Individual results vary significantly — some people lose more, some less. A prescriber can discuss realistic expectations for your situation.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) activates two hormone pathways (GIP and GLP-1), while Wegovy (semaglutide) activates one (GLP-1 only). Both are once-weekly injections. Mounjaro showed slightly higher average weight loss in trials, but both are effective. Your prescriber will advise which is more suitable.
How do I know if I'm eligible for prescription weight loss treatment?
Generally, eligibility starts at BMI 30 or above, or BMI 27–29.9 with a weight-related health condition. Use our free BMI calculator to check your starting point. Your GP or a licensed online prescriber can assess your individual eligibility during a consultation.
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.