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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Meal Plans for Mounjaro — UK Guidance
If you're taking Mounjaro (tirzepatide) as prescribed by your NHS specialist service or private prescriber, meal planning becomes an important part of your weight management journey. Mounjaro works by reducing appetite and helping you feel fuller after smaller meals, but pairing it with a structured eating approach can optimise results. This guide covers practical meal planning strategies, managing side effects through nutrition, and working alongside your Mounjaro dose titration schedule in the UK.
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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 Affects Your Eating and Meal Structure
Mounjaro is a dual GIP and GLP-1 receptor agonist that changes how your body signals hunger and fullness. Most people on Mounjaro notice reduced appetite within the first few weeks, particularly as their dose increases from the starting 2.5 mg through to their maintenance dose (typically 5–15 mg once weekly). This means traditional three large meals often feel uncomfortable — smaller, more frequent eating patterns typically work better.
Key nutritional strategies while on Mounjaro include:
- Prioritise protein at every meal — helps prevent muscle loss during weight loss and supports satiety longer. Aim for 20–30g per meal.
- Include plenty of vegetables — low calorie, high fibre, help manage any constipation (a common Mounjaro side effect).
- Avoid high-fat and greasy foods — these can trigger nausea in the first weeks, particularly at higher doses.
- Stay hydrated — drink water throughout the day; dehydration can worsen dizziness or fatigue.
- Choose softer textures initially — if you experience nausea, softer foods like yoghurt, soup, and scrambled eggs are often better tolerated than dense proteins.
Your GP or NHS tier 3 weight management service can refer you to a dietitian for personalised meal planning guidance.
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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.
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Building a Sustainable Meal Plan Alongside Mounjaro Treatment
A successful meal plan works with your Mounjaro dose schedule, not against it. In the first 4 weeks at 2.5 mg, many people manage standard three meals but with smaller portions. Once you move to 5 mg and higher doses, grazing with smaller meals (breakfast, light lunch, dinner, and optional snacks) often feels more natural.
Practical weekly planning tips: Prepare simple proteins in bulk (grilled chicken, lean mince, tofu), cook extra vegetables, and keep healthy grab-and-go options available (hard-boiled eggs, Greek yoghurt, nuts). Track your intake using our free progress tracker to monitor what works for your body as your dose increases. A sustainable approach combines Mounjaro with a calorie deficit of roughly 500 kcal/day, which supports steady weight loss of around 0.5–1 kg per week. Always discuss major dietary changes with your prescriber or NHS specialist team.
- 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 eat normally while taking Mounjaro?
Many people feel full more quickly on Mounjaro, so portion sizes naturally reduce. You can eat most foods, but meal frequency often changes to smaller, more frequent eating. Nausea in early weeks may mean avoiding high-fat foods temporarily. Your appetite typically stabilises after a few weeks at each dose level.
What foods should I avoid with Mounjaro?
No foods are strictly forbidden, but greasy, very fatty, or heavy foods can trigger nausea, particularly in the first weeks or after dose increases. Spicy foods may also cause discomfort for some people. Focus on lean proteins, vegetables, and whole grains. If you experience side effects, keeping a food diary helps identify triggers.
Will Mounjaro work better with a specific diet plan?
Mounjaro works alongside any healthy eating pattern. The NHS recommends using Mounjaro with a calorie deficit and increased physical activity for best results. Mediterranean-style eating or low-carb diets both work well for many people. A dietitian through your NHS tier 3 service can create a personalised plan matching your preferences.
How should I manage constipation from Mounjaro through diet?
Increase fibre gradually through vegetables, wholegrain cereals, and pulses. Drink plenty of water — at least 6–8 glasses daily. Add prune juice or ground flaxseed if needed. If constipation persists beyond 3 weeks, contact your GP or prescriber; they may recommend a stool softener alongside dietary changes.
Can I use a meal delivery service or SlimFast-type plans with Mounjaro?
Yes, many people use structured meal plans or replacement shakes alongside Mounjaro. Ensure any plan you choose includes adequate protein (20–30g per meal), doesn't rely solely on ultra-processed foods, and supports a sustainable calorie deficit. Always check with your prescriber if combining Mounjaro with any commercial weight loss programme.
Ready to take control of your weight loss journey?
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