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, Meals, and Eating in the UK: What You Need to Know
When taking Mounjaro (tirzepatide), many people experience significant changes to their eating habits and appetite. This guide explains how Mounjaro affects meals, meal planning strategies while on the injection, and the practical reality of accessing Mounjaro in the UK through both NHS and private routes. Whether you're considering Mounjaro or already prescribed, understanding how it influences food intake and what it costs will help you make informed decisions about this prescription weight loss injection.
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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 Changes Your Eating and Meal Patterns
Mounjaro is a dual GIP and GLP-1 receptor agonist — meaning it activates two natural hormone pathways that regulate appetite and fullness. Most people on Mounjaro experience reduced hunger, smaller portion sizes, and lower food cravings, especially in the first few weeks after starting or increasing their dose.
- Reduced appetite: Many users report needing significantly less food to feel satisfied
- Slower eating: Food passes through your stomach more slowly, creating a prolonged feeling of fullness
- Food aversions: Some people develop temporary aversions to certain foods, particularly high-fat or sugary items
- Nausea: In early weeks, some experience mild nausea which can further suppress appetite — this typically improves as your body adjusts
Meal planning on Mounjaro works best when you focus on nutrient-dense, lower-calorie foods (lean proteins, vegetables, whole grains) rather than high-calorie options, since portion sizes naturally decrease. Many people find eating smaller, more frequent meals suits them better than three large meals.
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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
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UK Access to Mounjaro: NHS vs Private Route and Costs
NHS access: Mounjaro is approved by NICE for weight management in specialist NHS tier 3 and tier 4 weight management services. However, NHS availability is extremely limited — most areas have significant waiting lists (sometimes 12–24 months) and strict criteria. You'll need a GP referral to your local integrated care board's specialist weight management service.
Private prescription route: Many UK adults access Mounjaro privately through online consultations with UK-licensed prescribers. Following a clinical assessment, prescribers can issue a prescription that you dispense at a GPhC-registered pharmacy. This route typically costs £129–£320 per month depending on your dose and the provider, with access usually available within days. Use our GLP-1 weight loss calculator to estimate potential results at different Mounjaro doses.
- 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.
Does Mounjaro affect how much I can eat?
Yes, significantly. Mounjaro reduces appetite and creates a stronger feeling of fullness after smaller portions. Most people naturally eat 30–50% less food within the first few weeks. This reduction is the primary mechanism supporting weight loss alongside a reduced-calorie diet.
What meals work best while taking Mounjaro?
Focus on protein-rich, nutrient-dense foods: chicken, fish, eggs, Greek yoghurt, beans, and plenty of vegetables. These keep you fuller longer on smaller portions. Avoid high-calorie, high-fat, and sugary foods, which can trigger nausea. Smaller, more frequent meals (3–4) often work better than three large ones.
Can I access Mounjaro through the NHS in the UK?
Yes, but availability is very limited. NICE approves tirzepatide (Mounjaro) through NHS specialist weight management services for adults meeting strict criteria (BMI ≥30 or BMI 27–29.9 with weight-related conditions). Most areas have lengthy waiting lists. Private prescription access is faster — typically available within days through online consultations with UK prescribers.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on your dose (2.5 mg to 15 mg) and the prescriber. Costs are highest at maximum doses. Check with multiple providers as prices vary. Many offer subscription models for ongoing prescriptions, and some provide support for NHS patients waiting for specialist services.
Will I be able to eat normal meals after stopping Mounjaro?
Yes. When you stop Mounjaro, appetite typically returns to baseline over 1–2 weeks. Returning to normal eating patterns is straightforward, though many people find they've developed better eating habits during treatment. Your GP can advise on maintaining weight loss after stopping, and our progress tracker helps you monitor changes long-term.
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.