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
Egg Diet For Weight Loss — How It Works In The UK
The egg diet is a low-calorie, high-protein eating plan that focuses on eggs as the primary source of nutrition, typically aiming for significant weight loss over a short period. Whilst eggs are nutritious and can support weight management when used as part of a balanced approach, this restrictive diet may not suit everyone. For UK adults looking at weight management options, it's worth understanding both dietary approaches like the egg diet and NHS-approved prescription weight loss medication available to eligible individuals.
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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
For adults struggling with sustainable weight loss through diet alone, the UK offers several prescription-only weight management medications available through NHS specialist services or private prescribing following clinical assessment.
Mounjaro (tirzepatide) is a once-weekly injection licensed for weight management in UK adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. Clinical trials showed participants lost an average of 15–21% body weight alongside dietary changes. Wegovy (semaglutide) is another once-weekly GLP-1 injection, with clinical evidence supporting approximately 15% average weight loss. Saxenda (liraglutide) is a daily injection option.
These medications work by helping regulate appetite and support feeling fuller after smaller meals. Individual results vary significantly, and all require a prescription from a licensed healthcare provider following a clinical assessment. They are prescribed alongside, not instead of, dietary and lifestyle changes.
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 Access, Private Options, And Eligibility In The UK
Access to prescription weight loss medication through the NHS is via referral to a specialist tier 3 weight management service. Availability and waiting times vary significantly by region. Private prescribing is available through UK-licensed online services following an online clinical assessment, with no NHS referral required.
To find out if you're eligible for prescription weight management treatment, discuss your BMI, health history, and weight loss goals with your GP. They can assess whether medication is appropriate for you or refer you to specialist services. Use our free BMI calculator above to check your personal BMI, then have an informed conversation with your healthcare provider about all available options—whether dietary approaches, weight loss programmes, or prescription medication.
- 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.
Is the egg diet safe for long-term weight loss?
The egg diet is very restrictive and not designed for long-term use. Whilst eggs are nutritious, relying on them almost exclusively can lack essential nutrients. Most health experts recommend balanced, sustainable approaches. NHS guidance supports gradual weight loss of 0.5–1 kg per week alongside varied nutrition. Speak to your GP about safe weight loss strategies.
How much weight can you lose on an egg diet?
Initial weight loss on the egg diet can be rapid—up to 5–6 kg in two weeks—largely due to water loss and severe calorie restriction. However, this is not typically sustainable. Most weight regain occurs after stopping the diet. Clinical evidence supports gradual, sustainable loss through consistent calorie deficit rather than extreme restriction.
What are UK prescription options for weight loss?
UK-licensed prescription weight loss medications include Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). All are prescription-only and available through NHS specialist services or private online prescribing. Eligibility requires clinical assessment. Try our GLP-1 weight loss calculator to understand potential outcomes with prescription medication.
How do I know if I'm eligible for NHS weight loss medication?
You may be eligible if your BMI is 30 or above, or 27–29.9 with weight-related health conditions like diabetes or high blood pressure. South Asian, Black African, Caribbean, and Chinese adults may have lower thresholds. Your GP can assess eligibility and refer you to specialist services where available, or discuss private prescribing options.
Should I try diet alone before considering medication?
Many people benefit from combining dietary changes with support programmes. If you've tried sustained diet and exercise changes without success, or if your weight significantly affects your health, prescription medication may be appropriate. Your GP can discuss what's best for your individual circumstances. Use our weight converter and BMI calculator to understand your current health status clearly.
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.