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 Ideas When On Mounjaro — What to Eat and How to Manage Appetite
When taking Mounjaro (tirzepatide), your appetite naturally decreases, which can make eating feel different. This guide explains practical meal strategies for people on Mounjaro, how to manage common side effects like nausea, and why eating patterns change compared to other weight loss medications. Whether you're starting your Mounjaro KwikPen or adjusting to a higher dose, understanding how to eat well while on this treatment is important for both health and comfort. Use our free GLP-1 weight loss calculator to see how Mounjaro may support your weight loss journey alongside proper nutrition.
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Calculate Your BMI Instantly
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 Eating and Appetite
Mounjaro works as a dual GIP and GLP-1 receptor agonist, meaning it activates two natural hormone pathways that regulate appetite and satiety. This dual mechanism can create a more pronounced reduction in hunger than single-action medications like Wegovy, which is a GLP-1 agonist only. Many people report feeling fuller after smaller meals, experiencing less food cravings, and sometimes needing reminders to eat.
In clinical trials (SURMOUNT-1), people on Mounjaro reported significant changes in appetite within the first few weeks, particularly as their dose increased. However, these changes affect people differently — some notice reduced appetite immediately, while others experience gradual changes over several weeks. Early side effects like nausea, particularly common in weeks 1–4 on each new dose, may also affect meal timing and food preferences temporarily.
- Nausea typically improves within 5–7 days but can return when doses increase
- Feeling full quickly is normal and expected
- Food aversions (sudden dislikes) can develop temporarily
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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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Practical Meal Ideas and Eating Strategies On Mounjaro
Smaller, protein-rich meals work best when on Mounjaro. Because you'll feel full faster, focus on nutrient-dense foods rather than volume. Good meal options include grilled fish with roasted vegetables, Greek yoghurt with berries, eggs with wholemeal toast, and lean chicken with sweet potato. Stay hydrated — drinking water between (not during) meals can help manage nausea and support weight loss.
If nausea occurs, stick to bland foods: plain toast, crackers, rice, boiled potatoes, or broth-based soups. Avoid fatty, greasy, or spicy foods initially, as these can worsen nausea. As your body adjusts, you can reintroduce variety. Most people find their appetite stabilises after 1–2 weeks at each dose, making normal eating patterns easier. Track your progress using our free progress tracker to monitor how meals affect your energy and wellbeing alongside your weight loss journey.
- 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.
How does appetite reduction on Mounjaro compare to Wegovy?
Mounjaro's dual GIP+GLP-1 mechanism often produces more pronounced appetite reduction than Wegovy's single GLP-1 action. In SURMOUNT trials, Mounjaro showed stronger satiety signals, meaning many people eat smaller portions. However, individual responses vary significantly — some people experience similar appetite changes on both medications. Your prescriber can advise which suits you best after clinical assessment.
What should I eat if I feel nauseous on Mounjaro?
Nausea is common, especially when starting or increasing doses. Stick to bland, easy-to-digest foods: plain rice, toast, boiled potatoes, crackers, clear broths, and plain chicken. Avoid fatty, spicy, or overly sweet foods. Eat small amounts frequently rather than large meals. Most nausea resolves within 5–7 days, after which you can reintroduce normal foods gradually. If nausea persists beyond 2 weeks, contact your GP.
Can I still eat normally while on Mounjaro?
Yes, but in smaller portions. Mounjaro's mechanism makes you naturally feel fuller faster, so "normal" meals may feel too large. Focus on nutrient-dense foods — lean proteins, vegetables, whole grains, and healthy fats — so each meal provides sustained energy and nutrition despite smaller volumes. This supports healthy weight loss alongside the medication.
Should I take Mounjaro before or after meals?
Mounjaro is a once-weekly injection and timing relative to meals doesn't matter — you inject on the same day each week regardless of eating. However, some people prefer injecting when they know they'll be home, as early side effects (nausea, stomach discomfort) are most common in the first 24–48 hours after injection. Choose whatever time suits your routine.
How do Mounjaro and Wegovy differ in how they affect meal planning?
Both reduce appetite, but Mounjaro's dual GIP+GLP-1 mechanism often means more pronounced changes to portion sizes and food preferences. Wegovy (GLP-1 only) typically produces gentler appetite reduction. Both require smaller, protein-rich meals for best results. The choice between them depends on individual clinical assessment — your prescriber will recommend based on your health, BMI, and any comorbidities. Use our BMI calculator to check your starting point for discussion with your healthcare provider.
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.