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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Mounjaro Meal Plans — Cost and Access in the UK
If you're considering Mounjaro (tirzepatide) for weight management, understanding both the medication itself and how to structure your eating around it is essential. Mounjaro works best when combined with a reduced-calorie diet and increased physical activity — not as a standalone solution. This guide explains what meal planning looks like on Mounjaro, how much it costs in the UK, and how to access it through NHS or private routes. Individual results vary, and a prescriber will assess your eligibility based on your personal health profile.
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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.
How Mounjaro Works With Your Diet
Mounjaro is a dual GIP and GLP-1 receptor agonist — a prescription-only injection that works alongside dietary changes, not instead of them. The medication helps regulate appetite and may support feeling fuller after smaller meals, but you still need to actively make healthier food choices. Most people taking Mounjaro find they naturally eat smaller portions and experience reduced cravings, particularly for high-calorie or sugary foods.
When starting Mounjaro, many people experience nausea, diarrhoea, or constipation — adjusting your meal composition can help manage these side effects. A typical approach involves eating smaller, more frequent meals and focusing on protein-rich foods, vegetables, and whole grains. You'll want to avoid very fatty or greasy foods during the first weeks of treatment, as these can trigger digestive discomfort. The exact meal plan depends on your individual tolerance, preferences, and any other health conditions you have.
Clinical trials showed Mounjaro helped participants lose an average of 15–21% of their body weight when combined with a reduced-calorie diet — though your personal weight loss will depend on your starting weight, dose, and adherence to dietary changes. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses.
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.
Mounjaro Cost and Access Routes in the UK
NHS Access: Mounjaro is approved by NICE for use within NHS specialist weight management services (tier 3 and 4). However, NHS access is limited by regional availability and waiting lists, which can be several months to years in some areas. Your GP must refer you to a specialist service, and eligibility is assessed based on your BMI and weight-related health conditions. Check your local Integrated Care Board (ICB) website to see if Mounjaro is available in your region.
Private Access: Mounjaro is available through private online prescribing services following a clinical assessment. Private costs typically range from £150–£300 per month depending on your dose. The KwikPen device (containing 4 weeks of injections) is dispensed by a GPhC-registered pharmacy after a prescriber confirms it's clinically suitable for you. Private access offers faster availability without NHS waiting lists, but comes at out-of-pocket expense.
The dose titration schedule typically starts at 2.5 mg and increases every 4 weeks to 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg — though many people stabilise at lower doses. Each step-up may involve different costs depending on your provider. An online consultation with a UK-licensed prescriber involves completing a health questionnaire, providing your medical history, and confirming your eligibility. If approved, your prescription is sent to a pharmacy for dispensing. Some private providers also offer ongoing check-ins to monitor your progress and adjust your plan.
- 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.
Do I need a prescription to get Mounjaro in the UK?
Yes, Mounjaro is prescription-only. You cannot buy it over-the-counter. Access is through either NHS specialist weight management services (with a GP referral) or private online prescribing services (following a clinical assessment with a UK-licensed prescriber).
How much does Mounjaro cost on the NHS?
Mounjaro is free on the NHS if you're prescribed it through a specialist tier 3 or 4 weight management service. However, NHS availability varies significantly by region, and waiting lists can be lengthy. Contact your GP or local ICB to check availability in your area.
What's the typical monthly cost for private Mounjaro?
Private Mounjaro typically costs £150–£300 per month depending on your dose. Starting doses (2.5 mg and 5 mg) are usually cheaper, whilst higher maintenance doses (10 mg to 15 mg) cost more. Compare providers carefully, as prices and included services vary.
What should I eat when taking Mounjaro?
Focus on protein-rich foods, vegetables, and whole grains in smaller portions. Avoid very fatty or greasy foods if you experience nausea or digestive issues. Mounjaro works best alongside a reduced-calorie diet and increased physical activity — it's not a replacement for dietary changes.
How quickly can I access private Mounjaro?
Private online consultations typically take 24–48 hours for assessment. If approved, your prescription is sent to a pharmacy within 1–2 days, and delivery usually follows within 2–5 working days. NHS access through specialist services can take several months to over a year depending on your region.
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.