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
Breakfasts for Weight Loss with UK Weight Management Support
Eating a nutritious breakfast is an important part of any weight loss plan, helping stabilise blood sugar and reduce cravings throughout the day. However, for many adults in the UK with excess weight, breakfast alone may not be enough—prescription weight management medications like Mounjaro and Wegovy, combined with healthy eating habits, offer additional support for those who are eligible. This guide explores how breakfast fits into a comprehensive approach to weight management and the NHS-approved medication options available to you.
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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 Prescription Weight Management Options
For UK adults struggling with weight loss, several prescription weight loss medications are now available through NHS specialist services and private prescribing. Mounjaro (tirzepatide) is a once-weekly injection licensed for weight management in adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. Wegovy (semaglutide) works in a similar way and is also once-weekly. Clinical trials showed that alongside a reduced-calorie diet and increased physical activity, these medications helped people lose an average of 15–21% of their body weight, though individual results vary significantly.
- Mounjaro may help reduce appetite and food cravings, making it easier to stick to healthy breakfast choices
- Eligibility depends on your BMI and health profile—use our free BMI calculator above to check where you stand
- Both medications are prescription-only and require clinical assessment before starting
- Weight loss works best when medication is combined with balanced nutrition, including a healthy breakfast
Your GP can discuss whether prescription weight management is suitable for you based on your individual circumstances.
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.
Getting Started: NHS and Private Access in the UK
If you're eligible for prescription weight loss medication in the UK, you have two main routes: referral to an NHS specialist weight management service (tier 3 services), or private prescribing through a licensed UK healthcare provider. NHS access varies significantly by region, and waiting times can be lengthy. Many people choose private online consultations, which offer faster access following a clinical assessment. Whichever route you take, weight loss medications are designed to work alongside lifestyle changes—healthy breakfasts, regular physical activity, and sustainable eating habits—not replace them. Tracking your progress alongside medication can help you stay motivated; our free progress tracker makes this simple. Always start by speaking with your GP about what's 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.
What should I eat for breakfast when taking weight loss medication like Mounjaro?
During weight loss treatment, aim for high-protein, fibre-rich breakfasts—eggs, Greek yogurt, oatmeal, or whole grain toast. These keep you fuller longer and support steady energy levels. Many people find smaller portions feel satisfying when taking GLP-1 medication due to reduced appetite. Avoid sugary cereals and pastries, which can spike blood sugar.
Are weight loss injections available on the NHS in the UK?
Yes, Mounjaro and Wegovy are available through NHS specialist weight management services for eligible adults. However, NHS access is through tier 3 specialist services (referral from your GP) and varies by region. Waiting times can be months to years in some areas. Private options are faster but require payment.
How do I know if I'm eligible for prescription weight loss medication?
Eligibility generally requires a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure. Use our free BMI calculator to check your personal BMI. Your GP or a licensed prescriber can formally assess whether medication is appropriate for you.
Can I use weight loss injections without changing my breakfast or diet?
Weight loss medications work best alongside dietary changes and increased physical activity. While these injections may naturally reduce appetite, studies showed the most significant weight loss occurred when medication was combined with a reduced-calorie diet and exercise. Sustainable results depend on overall lifestyle, not medication alone.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are once-weekly injections licensed for weight management in the UK. Mounjaro is a dual GIP and GLP-1 agonist; Wegovy is GLP-1 only. Clinical trials showed Mounjaro helped people lose an average of 15–21% body weight, and Wegovy around 15%, though individual results vary. Your prescriber can advise which suits you best.
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.