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
Good Foods To Eat On Mounjaro
When taking Mounjaro (tirzepatide), eating the right foods can make a significant difference to how well the medication works and how you feel. Mounjaro helps reduce appetite and supports feeling fuller after meals, but choosing nutrient-dense, easily digestible foods helps manage side effects like nausea and stomach discomfort. This guide covers practical nutrition advice for people taking Mounjaro in the UK, alongside lifestyle changes and medical guidance from your prescriber.
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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.
Foods That Work Well With Mounjaro
When taking Mounjaro, focus on lean proteins, vegetables, and whole grains that are easy to digest and nutrient-rich. Good protein choices include chicken breast, fish, eggs, Greek yoghurt, and plant-based options like lentils and tofu. These support muscle preservation during weight loss and help you feel satisfied with smaller portions.
- Vegetables: Broccoli, spinach, carrots, peppers, and green beans are low-calorie, high-fibre options
- Whole grains: Brown rice, oats, and wholemeal bread provide sustained energy and fibre
- Healthy fats: Avocados, nuts, seeds, and olive oil in moderation support nutrient absorption
- Low-sugar fruits: Berries, apples, and citrus fruits provide vitamins without excess sugar
Eat slowly and chew thoroughly—Mounjaro slows how food moves through your stomach, so eating quickly can worsen nausea. Smaller, more frequent meals often work better than three large meals. Our GLP-1 weight loss calculator can help you understand how nutrition supports your projected results with Mounjaro.
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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 Side Effect Management
Avoid high-fat, greasy, and heavily processed foods as these commonly trigger nausea and stomach upset on Mounjaro. Spicy foods, excessive caffeine, and sugary drinks should also be limited. Many people find that rich desserts, fried foods, and takeaways cause digestive discomfort during the first few weeks of treatment.
If nausea is bothersome, try ginger tea, plain crackers, or bland broths. Stay hydrated—aim for at least 2 litres of water daily, as Mounjaro can cause constipation or diarrhoea. Keep a food diary if certain foods trigger side effects. Your prescriber or a registered dietitian can give personalised nutrition advice based on your dose and individual tolerance. Remember that dietary changes work best alongside Mounjaro, not instead of it.
- 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 in the first week of taking Mounjaro?
Start with bland, easily digestible foods like plain chicken, white rice, toast, and vegetables. Small meals every 3–4 hours often work better than large meals. Avoid fatty and spicy foods. Ginger tea and clear broths can help with nausea. Most people find appetite naturally decreases, so portion control becomes easier.
Will I need to count calories while taking Mounjaro?
Mounjaro naturally reduces appetite, so many people eat less without strict calorie counting. However, weight loss still requires a calorie deficit, so being aware of portion sizes helps. Your prescriber or a dietitian can advise on whether detailed calorie tracking suits your approach.
Can I drink alcohol while taking Mounjaro?
Alcohol is not contraindicated with Mounjaro, but it may worsen nausea or low blood sugar risk (particularly if you also take diabetes medication). Alcohol is also calorie-dense, which can slow weight loss. If you drink, limit intake and check with your prescriber about what's safe for you personally.
How does Mounjaro affect my need for nutritional supplements?
Mounjaro doesn't directly cause nutrient deficiency, but eating smaller portions means you need to choose nutrient-dense foods carefully. Some people benefit from a multivitamin, particularly if nausea limits food intake. Discuss supplements with your GP or prescriber, especially if you're on other medications.
What's the difference between Mounjaro and Wegovy when it comes to diet?
Both are GLP-1-based medications (Mounjaro is dual GIP/GLP-1, Wegovy is GLP-1 only) and require similar dietary approaches—lean proteins, vegetables, whole grains, and smaller portions. Mounjaro may allow slightly larger portions due to its dual mechanism, but individual response varies. Your prescriber can advise on what suits you.
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.