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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High Protein Weight Loss Meals in the UK
High protein diets are popular for weight loss because protein helps you feel fuller for longer, supports muscle preservation during weight loss, and has a higher thermic effect than other nutrients. Combined with overall weight management strategies—including prescription options if eligible—high protein meals can be part of an effective approach. If you're looking at formal weight management in the UK, prescription medications like Mounjaro and Wegovy are available for eligible adults alongside dietary changes. Our free BMI calculator can help you understand if you might be eligible for prescription support, and our GLP-1 weight loss calculator shows potential outcomes with medication-supported approaches.
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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.
Prescription Weight Management Options in the UK
If you're pursuing weight loss through high protein nutrition, you may also qualify for prescription weight management medication in the UK. Three main options are licensed for weight loss:
- Mounjaro (tirzepatide) — a once-weekly injection that activates two hormone pathways (GIP and GLP-1) to reduce appetite and support weight management
- Wegovy (semaglutide) — a once-weekly GLP-1 injection that helps regulate hunger signals
- Saxenda (liraglutide) — a daily GLP-1 injection option
Clinical trials show that adults using these medications alongside dietary changes—including high protein meals—lose an average of 15–21% of body weight over 68 weeks, though individual results vary significantly. Eligibility typically requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. These are prescription-only medicines requiring clinical assessment from a GP or licensed prescriber.
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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: Finding Out If You're Eligible
In the UK, prescription weight loss medications are accessed through two routes. NHS access is through specialist tier 3 weight management services, typically following a GP referral. Availability and waiting times vary significantly by region. Private access is available through GPhC-registered online prescribers following a clinical assessment, without needing an NHS referral.
To find out if you might be eligible, start by calculating your BMI using our free BMI calculator on this page. If your BMI is 27 or above with health conditions, or 30 or above, medication may be an option. Book an appointment with your GP to discuss whether prescription weight management would suit your health situation, or explore private prescribing options online. Whatever route you choose, high protein nutrition should remain part of your overall approach alongside any 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.
Can I take weight loss medication if I just want to eat high protein meals?
Prescription weight loss medications like Mounjaro and Wegovy work best alongside dietary changes, including high protein eating plans. They're not a replacement for diet—they support appetite control alongside your nutritional choices. Your prescriber will assess whether medication is appropriate based on your BMI and health history, not just dietary preference.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are once-weekly injections. Mounjaro (tirzepatide) activates two hormone pathways (GIP and GLP-1), while Wegovy (semaglutide) activates one (GLP-1). Clinical trials show Mounjaro produced slightly higher average weight loss (up to 21% vs 15%), but results vary by individual. Your GP or prescriber will recommend the most suitable option for you.
Do I need to be referred to the NHS to get weight loss medication?
You can access prescription weight loss medication through the NHS by asking your GP for referral to a specialist weight management service, or through private online prescribing without an NHS referral. Private access is faster but involves payment. Both require a clinical assessment to confirm you're eligible.
How much weight can I lose combining high protein meals with weight loss medication?
Results vary by individual, medication dose, and adherence to dietary changes. Clinical trials show average weight loss of 15–21% of body weight over 68 weeks when medication is combined with reduced-calorie diets and increased physical activity. Use our free GLP-1 weight loss calculator to see projected outcomes at different doses based on your starting weight.
Is weight loss medication available on the NHS in my area?
Availability varies significantly by region and ICB (Integrated Care Board). Ask your GP whether specialist weight management services with medication are available in your area. If NHS access is limited or has long waiting lists, private prescribing is an alternative. Either route requires you to meet clinical eligibility criteria.
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.