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
Meal Ideas When On Mounjaro
When taking Mounjaro (tirzepatide), your appetite and food preferences may change significantly. This means meal planning needs to adapt to suit how your body responds to the medication. We've compiled practical meal ideas, portion guidance, and foods that work well for people using Mounjaro to support sustainable weight loss alongside reduced-calorie eating and increased physical activity. These suggestions are informational only — always consult your GP or prescriber for personalised dietary advice specific to your health needs.
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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.
Easy Meal Ideas for Mounjaro Users
When on Mounjaro, many people find they feel full more quickly and may experience nausea or changes in food preferences. Easy meals to try include:
- Grilled chicken or fish with steamed vegetables and a small portion of rice or sweet potato
- Vegetable-based soups or broths — often easier to tolerate when appetite is reduced
- Eggs (scrambled, poached, or omelettes) with toast and beans
- Cottage cheese or Greek yoghurt with berries and a small handful of granola
- Stir-fried vegetables with lean protein and minimal oil
- Baked white fish with asparagus and lemon
The key is choosing nutrient-dense foods in smaller portions. Your GLP-1 weight loss calculator can help you estimate projected outcomes at your Mounjaro dose, whilst maintaining balanced nutrition.
Clinically BackedWeight Loss
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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.
Foods to Avoid and Portion Tips
Foods that may be harder to tolerate: Fatty or greasy foods, spicy dishes, high-sugar items, and large portions often cause discomfort when on tirzepatide. Many people report that previously enjoyed foods taste different or less appealing.
Practical portion guidance: Start with smaller meals than you'd normally eat — your body will signal fullness sooner. Eat slowly, chew thoroughly, and stop when comfortably full, not stuffed. Drink water throughout the day but avoid large amounts of fluid with meals. Keep a food and symptom diary to identify which foods work best for you, and track your progress with our free progress tracker alongside your Mounjaro treatment plan.
- 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 I eat if Mounjaro makes me feel nauseous?
Smaller, blander meals often work better — try plain chicken, white rice, toast, or crackers. Ginger tea or lemon water may help settle nausea. Avoid strong spices, fatty foods, and alcohol. If nausea persists, contact your prescriber as dose adjustment may help.
How much should I eat on Mounjaro?
Portion sizes are very individual as Mounjaro affects appetite differently for each person. Start smaller than you normally would and listen to hunger cues. Most people naturally eat less due to increased fullness. Your GP can offer personalised guidance based on your calorie goals.
Are there foods I should definitely avoid on Mounjaro?
Greasy, fried, and high-fat foods are commonly reported as difficult to tolerate. High-sugar foods, very spicy dishes, and large meals may also cause stomach discomfort. However, tolerance varies between individuals — keep track of what works for you.
Can I eat normally again after starting Mounjaro?
Over time as your body adjusts, food preferences may normalise. However, many people find their appetite naturally remains lower than before treatment, which supports continued weight management. Work with your prescriber or a dietitian for long-term dietary planning.
Does meal timing matter when taking Mounjaro?
Mounjaro is injected once weekly and doesn't require timing meals around doses. However, eating regular, balanced meals at consistent times can help stabilise energy levels and prevent overeating. Avoid very large meals, which may cause discomfort due to the medication's gastric effects.
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.