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
Free tracker included with every download this week
What Do People Eat On Mounjaro?
When taking Mounjaro (tirzepatide), many people naturally eat smaller portions and feel satisfied more quickly due to how the medication works. This doesn't mean eating nothing — it means adjusting to reduced appetite and making nutritious choices that work with the medication's effects. Understanding typical eating patterns while on Mounjaro can help you plan meals and support sustainable weight loss alongside your prescription.
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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 Appetite And Food Choices
Mounjaro is a dual GIP and GLP-1 receptor agonist that reduces hunger signals and slows how food moves through your stomach. This means most people experience significantly reduced appetite — not through restriction, but through genuine biological changes. You may find you feel full after smaller meals, lose interest in previously enjoyed foods, and experience fewer cravings.
- Portion sizes typically decrease: What was a normal meal may now feel like too much
- Nausea can affect food choice: Rich, fatty, or highly spiced foods often trigger nausea — many people naturally avoid them
- Protein becomes important: To preserve muscle during weight loss, adequate protein intake matters, though appetite reduction means smaller amounts of protein-rich foods
- Hydration is crucial: With reduced food intake, drinking enough water prevents constipation (a common side effect)
- Individual experiences vary: Some people tolerate most foods; others find certain textures or flavours problematic
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Practical Eating Patterns On Mounjaro
Most people on Mounjaro eat three smaller meals daily rather than grazing or skipping meals. Typical choices include protein-focused meals (chicken, fish, eggs), non-starchy vegetables, and complex carbohydrates in reduced quantities. Some people find soft or easily digestible foods easier during early weeks. Tracking your intake using our free GLP-1 weight loss calculator can help you understand how your food choices align with your health goals. It's essential to eat enough calories — severely restricting food leads to muscle loss and nutritional deficiency. Your GP or prescriber can advise on minimum daily intake and nutritional needs during treatment.
- 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 normal foods while taking Mounjaro?
Yes — Mounjaro doesn't restrict food types. However, your appetite will be significantly reduced, and nausea may make certain foods unappealing. Most people find they naturally eat smaller portions of the foods they normally enjoy. Fatty, spicy, or very sweet foods commonly trigger nausea. Work with your body's signals rather than forcing foods you no longer want.
Will I feel hungry on Mounjaro?
Most people report dramatically reduced hunger — this is how the medication works. However, true hunger can still occur, particularly between doses. The difference is that the urgent, all-consuming hunger many people experience before Mounjaro is typically replaced by mild, manageable appetite. Some people describe feeling "satisfied" rather than "full".
What happens if I don't eat enough on Mounjaro?
Eating too little while on Mounjaro can lead to muscle loss, nutritional deficiency, fatigue, and slower metabolism. The medication reduces appetite; it doesn't mean you should severely restrict calories. Aim for balanced meals with adequate protein and nutrients. Your GP can advise on minimum daily intake. Use our BMI calculator to track progress and discuss healthy eating patterns with your prescriber.
Do Mounjaro side effects affect what people can eat?
Yes — nausea, constipation, and indigestion are common side effects that influence food choices. Many people avoid fatty or very sweet foods because they worsen nausea. Increased water intake, fibre from vegetables, and smaller meals help manage constipation. Side effects usually improve as your body adjusts and you find your optimal dose.
How is Mounjaro different from Wegovy for eating patterns?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) activates GLP-1 only. Clinical data suggests Mounjaro may produce slightly greater appetite suppression. However, individual responses vary significantly — some people tolerate eating better on one than the other. Both medications support weight loss through reduced appetite rather than restriction.
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.