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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Best Foods For Mounjaro — UK Nutrition Guide
When taking Mounjaro (tirzepatide) for weight management in the UK, eating the right foods can help reduce nausea, manage side effects, and support sustainable weight loss. This guide covers foods that work well with Mounjaro, NHS nutritional principles, and practical meal ideas to help you feel better while taking this prescription injection. Individual tolerance varies, so speak with your GP or registered dietitian for personalised advice aligned with your health needs.
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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 That Work Well With Mounjaro
Lean proteins are essential when taking Mounjaro. Opt for grilled chicken breast, turkey, fish (especially salmon and white fish), and eggs. These foods digest well, keep you satisfied with smaller portions, and support muscle maintenance during weight loss. Low-fat Greek yoghurt and cottage cheese are also excellent options.
- Oily fish like mackerel and sardines provide omega-3 fatty acids, which support heart health — particularly important if you're taking Mounjaro for weight-related cardiovascular conditions
- Lean beef and pork are acceptable but choose lower-fat cuts to avoid triggering nausea
- Plant-based proteins such as lentils, chickpeas, and tofu work well if tolerated — start small as legumes can cause bloating
Non-starchy vegetables should form the foundation of your meals. Broccoli, spinach, peppers, courgettes, green beans, and leafy greens are nutrient-dense and low-calorie. They're easy on the stomach and help you reach healthy weight targets without excess calories. Ginger-based dishes may specifically help ease nausea associated with GLP-1 receptor agonists like tirzepatide.
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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 NHS Guidance
High-fat and fried foods often trigger nausea and digestive discomfort when taking Mounjaro. Avoid takeaway meals, fried chips, fatty meats, and creamy sauces. Sugary foods — including sweets, cakes, and sugary drinks — may cause discomfort and work against your weight loss goals.
- Spicy foods can worsen nausea for some people; introduce them gradually and monitor your tolerance
- Alcohol should be limited or avoided entirely, as Mounjaro may increase sensitivity and it provides empty calories
- Very large portions trigger the side effects Mounjaro causes — eat slowly and stop when satisfied
- Processed foods high in salt and additives offer little nutrition and may cause bloating
The NHS recommends a balanced diet rich in whole foods, fibre, and water alongside any weight management medication. Use our free BMI calculator to track your progress, and consider our GLP-1 weight loss calculator to understand expected outcomes at your Mounjaro dose.
- 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?
Eat small, bland meals with lean protein, cooked vegetables, and whole grains. Ginger tea, bone broth, and simple soups are often well-tolerated. Avoid fatty, spicy, and rich foods. Nausea typically improves over time as your body adjusts. If severe nausea persists, contact your GP or the healthcare provider managing your Mounjaro kwikpen prescription.
Can I eat carbohydrates while taking Mounjaro?
Yes — focus on wholegrain carbohydrates like brown rice, oats, sweet potatoes, and wholemeal bread. These provide sustained energy and fibre, which helps manage blood sugar. Avoid refined carbohydrates and sugary foods, which offer little nutrition and may worsen nausea or cause rapid blood sugar spikes.
How much protein do I need daily on Mounjaro?
Aim for 25–30g protein per meal to preserve muscle during weight loss. This may feel like less food than before — Mounjaro reduces appetite, so smaller portions satisfy you. Your GP or a registered dietitian can advise on your specific protein needs based on your weight and activity level.
Is the Mounjaro vs Wegovy diet different?
Both are GLP-1 receptor agonists with similar dietary tolerances. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is GLP-1 only, but practical nutrition guidance is comparable. Eat small portions of lean protein and vegetables, avoid fatty foods, and stay hydrated. Your prescriber will give diet-specific advice.
Do I need special meals for Mounjaro dose titration?
During dose titration — when your Mounjaro dose increases from 2.5mg to 5mg, 7.5mg, and beyond — side effects may temporarily worsen. Continue with small, bland meals, stay hydrated, and avoid triggers. Most people adjust within a week per dose. If nausea severely affects eating, contact your GP immediately.
Ready to take control of your weight loss journey?
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