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: What To Eat While Taking Tirzepatide
If you're taking Mounjaro (tirzepatide), the right meal plan can make a significant difference to your experience and results. Mounjaro works by reducing appetite and helping you feel fuller after smaller meals, but this means adjusting what and how you eat is essential. This guide covers practical, evidence-based meal planning strategies for UK users taking Mounjaro at any dose, from 2.5 mg through to the maximum 15 mg weekly 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.
Meal Planning While Taking Mounjaro
When you start Mounjaro, your appetite naturally decreases — which means your calorie needs drop significantly. A successful meal plan focuses on nutrient density rather than volume. Choose foods packed with protein, fibre, and healthy fats that keep you satisfied on smaller portions.
- Protein at every meal: Aim for 25–30g per meal. Lean chicken, fish, eggs, Greek yoghurt, and plant-based options all work well. Protein helps preserve muscle during weight loss and keeps hunger at bay longer.
- Plenty of vegetables: Fibre-rich veg (broccoli, spinach, peppers, courgettes) help with fullness and digestion, especially important given that Mounjaro can cause constipation or diarrhoea.
- Healthy fats: Avocado, olive oil, nuts, and fatty fish provide satiety and nutrient absorption.
- Whole grains (in small amounts): Oats, brown rice, and wholemeal bread provide sustained energy without excessive calories.
Avoid ultra-processed foods, sugary drinks, and high-fat takeaways — these are often high in calories with minimal nutrition, making it easier to exceed your needs despite reduced appetite.
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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.
Managing Nausea And Mounjaro Side Effects With Food
Nausea is one of the most common side effects when starting Mounjaro or increasing your dose. Small, frequent meals work better than three large meals. Eat slowly, chew thoroughly, and stop when satisfied — not when your plate is empty. If nausea strikes, try ginger tea, crackers, or cold foods rather than hot meals. Stay hydrated with water and herbal teas throughout the day. Avoid greasy, spicy, or overly rich foods that can trigger nausea. Some people find that eating smaller portions every 3–4 hours, rather than traditional meal times, reduces side effects significantly. If nausea persists beyond the first few weeks or worsens, speak to your GP — your Mounjaro dose may need adjusting, or anti-nausea medication might help.
- 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.
What should a typical day of eating look like on Mounjaro?
Start with a small protein-rich breakfast (eggs, yoghurt, or oatmeal with berries). Mid-morning, have a small snack if hungry — nuts or fruit. Lunch should be lean protein with lots of vegetables and a small portion of whole grains. Afternoon snack optional. Dinner, again, should be protein and veg-focused. Most people find they eat 1,200–1,600 kcal daily on Mounjaro without feeling deprived. Use our free GLP-1 weight loss calculator to estimate your calorie needs based on your dose.
Can I eat normally on Mounjaro, or do I need to follow a strict diet?
You don't need a "diet" in the traditional sense, but you do need to eat mindfully. Mounjaro reduces appetite so dramatically that eating normally becomes difficult — and unnecessary. Focus on nutrient-dense foods in appropriate portions. Most people naturally eat less without strict calorie counting. Your GP or a dietitian can provide personalised guidance if you're unsure.
Does Mounjaro work without changing what I eat?
Mounjaro works best alongside dietary changes and physical activity. Clinical trials showed weight loss occurred when people combined the injection with a reduced-calorie diet and increased movement. Without any dietary adjustment, results will be significantly reduced. Mounjaro is a tool to help you succeed with lifestyle changes, not a replacement for them.
What foods should I avoid on Mounjaro?
Avoid high-fat, high-sugar, and ultra-processed foods — not because they're forbidden, but because they're calorie-dense with low nutritional value. They're also more likely to trigger nausea. Sugary drinks, fried foods, pastries, and full-fat processed meats are common triggers. Alcohol, especially on an empty stomach, can worsen nausea and dehydration.
Should I take a multivitamin while on Mounjaro?
Because you're eating significantly less, you may benefit from a multivitamin to cover nutritional gaps. Speak to your GP before starting supplements. Some people find B vitamins helpful for energy, and iron supplementation may be needed if you've experienced heavy periods. Your GP can order blood tests to check for deficiencies if you're concerned about nutrition.
Ready to take control of your weight loss journey?
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