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
Breakfast Weight Loss Meals and UK Weight Management Medication
Starting your day with a balanced breakfast can support weight loss goals, but for eligible adults in the UK, prescription weight management medication may also help. If you're aiming to lose weight, understanding both dietary strategies and available medical options is important. This guide covers breakfast nutrition, UK-licensed weight loss injections, and how to find out if prescription treatment is right for you alongside lifestyle changes.
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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 Loss Options
Several prescription weight loss medications are now available in the UK for adults with a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions. The three main options are Mounjaro (tirzepatide), a once-weekly dual GIP and GLP-1 injection; Wegovy (semaglutide), a once-weekly GLP-1 injection; and Saxenda (liraglutide), a daily injection. Clinical trials show these medications can support significant weight loss alongside dietary changes and physical activity. Mounjaro clinical data showed average weight loss of 15–21% of body weight, while Wegovy demonstrated approximately 15% average loss. Individual results vary considerably. All three are prescription-only medicines requiring clinical assessment by a licensed prescriber. Our free GLP-1 weight loss calculator can help you estimate potential outcomes at different doses. These medications work best when combined with balanced meals—including a nutritious breakfast—and increased activity.
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 vs Private Routes
In the UK, you can access prescription weight loss medication through two routes. NHS access is via specialist tier 3 weight management services; your GP can refer you, though waiting lists vary significantly by region and availability is limited. Private access is available through GPhC-registered online pharmacies following an online clinical assessment—no NHS referral needed. Before starting any medication, discuss your weight management goals with your GP. They can assess your BMI, review weight-related health conditions, and advise whether prescription treatment is suitable for you. Calculate your personal BMI using our free BMI calculator to understand your starting point. A balanced breakfast—such as eggs, porridge, or Greek yogurt with fruit—combined with medication and lifestyle changes offers the best chance of sustainable weight loss.
- 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 if I'm trying to lose weight?
Include protein (eggs, Greek yogurt, or lean ham), whole grains (oats or wholemeal toast), and fibre-rich vegetables or fruit. These keep you fuller longer and support steady energy. Avoid sugary cereals and pastries. Aim for 20–30g protein and under 400 kcal for a balanced breakfast that supports weight loss.
Am I eligible for weight loss medication in the UK?
Eligibility depends on your BMI and health. You may be eligible if you have a BMI of 30+, or 27–29.9 with weight-related conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Your GP or a licensed prescriber can assess you. Use our free BMI calculator to check your starting point.
What's the difference between Mounjaro and Wegovy?
Both are once-weekly injections, but Mounjaro is a dual GIP/GLP-1 agonist (15mg max) and Wegovy is GLP-1 only (2.4mg max). Mounjaro showed slightly higher average weight loss in trials (15–21% vs 15%), but individual results vary. Your prescriber will recommend which is most suitable.
How quickly will I lose weight with medication?
Weight loss typically takes 2–4 weeks to become noticeable. Most people lose 0.5–1kg weekly on average, though this varies. Clinical trials ran for 68–72 weeks to show full effects. Medication works best alongside a reduced-calorie diet and increased physical activity—a healthy breakfast is part of this.
Can I get weight loss injections on the NHS?
Yes, but access is limited. You need referral to a tier 3 specialist weight management service through your GP. Waiting lists vary by region and can be long. Private access is faster via GPhC-registered pharmacies following online clinical assessment. Either route requires a prescription and clinical eligibility check. ```
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.