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
Best Weight Loss Breakfast Foods in the UK
Starting your day with the right breakfast can support sustainable weight management. In the UK, evidence-based options include high-protein foods, whole grains, and fibre-rich choices that help you feel fuller longer. However, breakfast alone won't create the weight loss you need — a calorie deficit, consistent physical activity, and sometimes medical support are essential. If you're struggling with weight management, prescription options are available in the UK for eligible adults. This guide covers both dietary strategies and the medication options your GP can discuss with 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 Loss Options Available
If you're overweight or obese, prescription weight loss medication is available in the UK for eligible adults. The three main options are Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These are GLP-1 medications (or GIP/GLP-1 in the case of Mounjaro) that may help reduce appetite and support weight management alongside diet and exercise.
Eligibility: You may be eligible if your BMI is 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. Check your BMI using our free BMI calculator to see if you fall into the eligible range.
Clinical trials showed average weight loss of 15–21% of body weight with these medications, though individual results vary significantly. These are prescription-only medicines requiring assessment by a licensed prescriber.
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
In the UK, weight loss medication is available through two routes. NHS access is through specialist tier 3 weight management services — you'll need a GP referral, and availability varies by region. Private access is through UK-licensed online prescribers and GPhC-registered pharmacies, without requiring an NHS referral.
Whichever route you choose, a prescriber will assess whether medication is suitable based on your health history. Start by speaking to your GP about weight loss options, or use our GLP-1 weight loss calculator to explore projected outcomes with prescription medication. Your GP can advise on NHS availability in your area and discuss 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.
What makes a breakfast good for weight loss?
High-protein breakfasts (eggs, Greek yoghurt, protein pancakes) and fibre-rich foods (oats, berries, whole grain toast) help you feel fuller longer and reduce mid-morning cravings. Aim for 25–30g of protein and at least 5g of fibre. Avoid sugary cereals and pastries, which cause blood sugar spikes and hunger.
Can breakfast foods alone help me lose weight?
No. Weight loss requires a calorie deficit across the whole day, regular physical activity, and often long-term lifestyle change. Breakfast is just one meal. If you're struggling despite healthy eating, prescription weight loss medication may help — speak to your GP about eligibility.
How do GLP-1 medications like Wegovy and Mounjaro work?
These prescription medications activate hormones that reduce appetite, help you feel fuller after smaller meals, and slow stomach emptying. Clinical trials showed average weight loss of 15–21% of body weight over 68+ weeks, alongside diet and exercise. Individual results vary significantly.
Am I eligible for prescription weight loss medication in the UK?
You may be eligible if your BMI is 30 or above, or 27 or above with weight-related conditions like diabetes, high blood pressure, or sleep apnoea. Use our free BMI calculator to check your BMI, then speak to your GP about whether medication is appropriate for you.
How do I access weight loss medication — NHS or private?
NHS access requires a GP referral to specialist services (availability varies by region and waiting lists can be long). Private access is through online prescribing services without a referral. Either way, a prescriber must assess your eligibility. Your GP can advise on NHS options in your area.
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.