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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Best Weight Loss Breakfast for Weight Management in the UK
A nutritious breakfast can support your weight management journey, but for many adults in the UK, diet alone isn't enough. If you're struggling with weight loss despite healthy eating, prescription weight loss medication may be an option worth discussing with your GP. This guide covers breakfast strategies alongside current prescription weight management options available through the NHS and private healthcare. Understanding what's available can help you make informed decisions about your health.
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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.
Prescription Weight Loss Options Available in the UK
Three prescription-only weight loss medications are currently licensed in the UK for adults with obesity or overweight with weight-related health conditions. Mounjaro (tirzepatide) is a once-weekly injection that activates two natural hormone pathways (GIP and GLP-1), helping reduce appetite and support feeling fuller after meals. Wegovy (semaglutide) is another once-weekly GLP-1 injection that works similarly. Saxenda (liraglutide) is a daily GLP-1 injection option. Clinical trials show these medications can help people lose 15–21% of body weight on average when combined with a reduced-calorie diet and increased physical activity. Individual results vary significantly.
- Mounjaro: escalates from 2.5 mg to 15 mg over several weeks
- Wegovy: escalates from 0.25 mg to 2.4 mg over several weeks
- Saxenda: escalates from 0.6 mg to 3 mg over several weeks
- All require a clinical assessment before prescription
- All work best alongside healthy eating and physical activity
A balanced breakfast supporting weight management typically includes protein (eggs, Greek yoghurt, cottage cheese), whole grains (oats, wholemeal toast), and healthy fats (avocado, nuts). These help keep you fuller longer. Using our BMI calculator can help you assess your current weight status and whether you might benefit from further support.
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
Access to prescription weight loss medication in the UK differs between NHS and private routes. Through the NHS, you would be referred by your GP to a tier 3 or tier 4 specialist weight management service if eligible. However, NHS waiting lists vary significantly by region and can be lengthy. Privately, prescription weight loss medication is available through GPhC-registered online prescribers following a remote clinical assessment, without an NHS referral.
To find out if you're eligible, book an appointment with your GP to discuss your weight management goals and health history. Your GP can assess your BMI, any weight-related health conditions (like type 2 diabetes, high blood pressure, or sleep apnoea), and whether prescription medication might be appropriate for you. You can also use our free GLP-1 weight loss calculator to explore potential outcomes at different dose levels, giving you helpful talking points for your GP conversation.
Eligibility criteria for prescription weight loss treatment in the UK include:
- BMI of 30 or above (obesity), OR
- BMI of 27–29.9 (overweight) with at least one weight-related health condition
- For South Asian, Chinese, Black African, or Black Caribbean adults, BMI thresholds may be lower (27.5 or above)
- Must be 18 years or older
- Not pregnant, planning pregnancy, or breastfeeding
Combining a healthy breakfast rich in protein and fibre with professional support—whether lifestyle coaching, NHS weight management services, or prescription medication—creates the best foundation for sustainable weight loss and improved health outcomes.
- 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's the best breakfast for weight loss?
A weight loss breakfast should combine protein (eggs, Greek yoghurt), whole grains (oats), and healthy fats (nuts, avocado) to keep you fuller longer and stabilize blood sugar. Aim for 25–30g protein and plenty of fibre. Avoid sugary cereals and pastries. This approach naturally reduces later snacking and calorie intake throughout the day.
Can I get prescription weight loss medication on the NHS in the UK?
Yes. If eligible, you can be referred to a specialist weight management service by your GP. Eligibility includes BMI 30+ or BMI 27–29.9 with weight-related health conditions. NHS availability varies by region and waiting lists can be long. Private prescription weight loss is also available through online clinical assessments.
How much weight can you lose with Mounjaro or Wegovy?
Clinical trials show people lose an average of 15–21% of body weight with these medications over 68–72 weeks, alongside a reduced-calorie diet and exercise. However, individual results vary significantly. Some lose more, some less. These medications work best combined with lifestyle changes, not as replacements for healthy eating.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist with a maximum dose of 15 mg weekly. Wegovy (semaglutide) is a GLP-1 agonist only with a maximum dose of 2.4 mg weekly. Clinical trial data suggests Mounjaro may produce slightly greater average weight loss, but both are effective. Choice depends on individual suitability and prescriber assessment.
Do I need to change my diet if I take weight loss medication?
Yes. Prescription weight loss medications work best alongside a reduced-calorie diet and increased physical activity. These medications help reduce appetite and support feeling fuller, but they're not replacements for healthy eating habits. Your prescriber will discuss dietary changes and can refer you to a dietitian for personalized guidance.
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.