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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What Foods To Eat On Mounjaro: A UK Nutrition Guide
When taking Mounjaro (tirzepatide) for weight management, choosing the right foods can make a significant difference to how you feel and how well the medication works alongside your reduced-calorie diet. Mounjaro often causes nausea, reduced appetite, and digestive changes, especially when you first start or increase your dose. This guide explains which foods are gentler on your stomach, help you stay nourished, and support sustainable weight loss. As always, speak with your GP if you experience persistent side effects or have concerns about your diet.
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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.
Foods To Eat On Mounjaro: Practical Choices
Start with small, frequent meals rather than three large ones — this is one of the most important strategies when taking Mounjaro. Eat slowly and chew thoroughly, as the medication slows how quickly food leaves your stomach. Protein-rich foods should be your priority: lean chicken, turkey, fish, eggs, Greek yoghurt, and cottage cheese help you feel fuller for longer and preserve muscle during weight loss. Gentle carbohydrates include white rice, pasta, plain bread, and potatoes — avoid high-fibre cereals or wholemeal bread initially, as these can worsen nausea and bloating. Hydration is essential — sip water, herbal tea, or clear broths throughout the day rather than drinking large amounts at once. Foods to minimise include fatty or fried foods, spicy dishes, high-sugar items, and anything with strong flavours, as these can trigger nausea. Many people find that cold or room-temperature foods are better tolerated than hot meals. Keep a food diary to identify which specific foods work best for your body.
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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.
Accessing Mounjaro In The UK: Cost And Route
Mounjaro is available in the UK through two main routes: NHS specialist services and private prescription. NHS access is typically through tier 3 specialist weight management services following a GP referral, though availability and waiting times vary significantly by region. Private access is faster — you can obtain a prescription through an online consultation with a UK-licensed prescriber, usually within 24 hours, and collect from a GPhC-registered pharmacy. Private costs typically range from £129 to £320 per month depending on your dose — the Mounjaro KwikPen contains 4 weekly injections. Your eligibility, whether NHS or private, depends on your BMI, health conditions, and individual circumstances. Use our GLP-1 weight loss calculator to understand how Mounjaro might work for you, and consult your GP about which route is right for you.
- 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 normally when taking Mounjaro?
Not immediately. Most people find their appetite significantly reduced, especially in the first 4–8 weeks. You'll likely eat smaller portions automatically. Focus on nutrient-dense, easy-to-digest foods rather than trying to eat "normally." As you adjust to your dose, some appetite returns, but it typically stays lower than before Mounjaro.
What foods should I avoid on Mounjaro?
Avoid fatty, fried, and greasy foods (they worsen nausea), high-sugar items, spicy dishes, high-fibre foods initially, and anything with strong flavours. Alcohol can also trigger nausea and should be limited. Caffeine on an empty stomach may also cause discomfort. Keep a food diary to identify your personal triggers.
Will my nutritional needs change on Mounjaro?
Yes. Because you're eating less, it's critical to choose nutrient-dense foods: lean protein, vegetables, fruits, whole grains, and healthy fats in smaller amounts. Many people benefit from a multivitamin or nutritional support while on Mounjaro. Discuss this with your GP or a registered dietitian.
How long do food tolerances take to improve on Mounjaro?
Most people find nausea and digestive issues peak in weeks 1–2 of each dose increase, then gradually improve over 4–8 weeks as their body adjusts. By week 12 on a stable dose, many can tolerate a wider variety of foods. Individual timelines vary significantly.
Is there a connection between food choices and Mounjaro's weight loss effectiveness?
Yes. Mounjaro works best alongside a reduced-calorie, nutrient-dense diet and physical activity. Choosing protein-rich, high-satiety foods helps you maintain a calorie deficit without feeling deprived. Our GLP-1 weight loss calculator can show you projected outcomes based on realistic calorie reduction.
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.