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 Plan: NHS Support and Dietary Guidance for UK Adults
If you're taking Mounjaro (tirzepatide) or considering it through the NHS, understanding how to structure your meals is an essential part of successful weight management. Mounjaro is a prescription-only GIP and GLP-1 receptor agonist injection that works alongside dietary changes and increased physical activity—not instead of them. This guide explains meal planning support available through NHS tier 3 weight management services, how Mounjaro affects appetite and food intake, and practical steps to get the most from treatment 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.
NHS Support for Mounjaro Meal Planning and Dietary Changes
When you access Mounjaro through an NHS specialist weight management service (tier 3), you'll typically receive support from a multidisciplinary team that includes dietitians, behavioural coaches, and doctors. These professionals help you create a personalised meal plan suited to your health goals and lifestyle.
Mounjaro works by activating GIP and GLP-1 hormone pathways, which reduce hunger signals and help you feel fuller after smaller meals. This means your meal plan will naturally shift towards smaller portions and reduced calorie intake. NHS dietitians can guide you through:
- Identifying foods that satisfy you with smaller quantities
- Managing nausea or appetite loss during dose titration (as you progress through 2.5mg to 15mg)
- Ensuring adequate nutrition despite reduced food intake
- Building sustainable eating habits that continue after treatment
- Monitoring blood sugar and managing any diabetes-related dietary needs
Unlike private weight loss consultations, NHS-supported meal planning is integrated with your entire treatment pathway and monitored by your 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.
Key Nutritional Considerations When Taking Mounjaro
Mounjaro slows how quickly food leaves your stomach, which can cause nausea, particularly in the first weeks and during dose titration (when your dose increases every 4 weeks from 2.5mg to your maintenance level). Your meal plan should prioritise protein-rich, nutrient-dense foods in small portions rather than large meals.
Common dietary adjustments include eating protein at every meal, staying hydrated, avoiding high-fat or very sweet foods that may worsen nausea, and spacing meals evenly throughout the day. If you're accessing Mounjaro through the NHS, your dietitian will tailor recommendations to any existing health conditions—such as type 2 diabetes or high blood pressure—ensuring your meal plan supports both weight loss and overall health.
Use our free BMI calculator to track your baseline, and our GLP-1 weight loss calculator to see projected outcomes at different doses—both tools help inform realistic meal planning goals alongside your NHS 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 get meal plan support from the NHS when taking Mounjaro?
Yes. If you're prescribed Mounjaro through an NHS tier 3 specialist weight management service, you'll have access to a dietitian and behavioural support team who create a personalised meal plan. Private prescribing may not include this level of support—always check what's included with your provider.
What foods should I avoid when taking Mounjaro?
High-fat, very sugary, and spicy foods may worsen nausea, especially during dose titration. Focus on lean protein, vegetables, whole grains, and low-fat options. Your NHS dietitian will give you a tailored food list based on your health conditions and preferences.
How does Mounjaro change how much I should eat?
Mounjaro reduces hunger and makes you feel fuller on smaller portions. Your meal plan should reflect this by reducing portion sizes rather than cutting entire food groups. NHS support helps you navigate this transition safely without nutrient deficiencies.
Will I need to follow a low-calorie diet to see results with Mounjaro?
Mounjaro supports weight loss through reduced appetite, so you naturally eat fewer calories—a formal low-calorie diet isn't always necessary. NHS guidance recommends a moderate calorie deficit (around 500 kcal/day) for safe, sustainable loss of 0.5–1kg per week.
How long does it take to adjust to eating smaller meals on Mounjaro?
Most people adapt within 2–4 weeks per dose increase. Your NHS team monitors this during your treatment and adjusts your meal plan as needed. If nausea persists beyond a few weeks, tell your GP—they may adjust your dose or timeline.
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.