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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Mounjaro Meal Plans: NHS Guidance for UK Users
When taking Mounjaro (tirzepatide) as a prescription weight management medicine in the UK, meal planning becomes an important part of your treatment. Since Mounjaro works by reducing appetite and helping you feel fuller after smaller meals, your eating patterns may change significantly. This guide explains practical meal planning strategies for Mounjaro users, NHS nutritional guidance, and how to support your weight loss journey with balanced eating. Understanding how to adjust your meals while taking this GLP-1 and GIP receptor agonist helps maximise your results and manage side effects like nausea.
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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 Changes Your Appetite and Eating Habits
Mounjaro works by activating GLP-1 and GIP hormone pathways in your body, which signals fullness to your brain and slows how quickly food leaves your stomach. This means most people eating on Mounjaro naturally eat smaller portions without feeling deprived. In clinical trials like SURMOUNT-1, participants achieved average weight loss of 15–21% body weight when combining Mounjaro with a reduced-calorie diet and increased physical activity.
Key appetite changes to expect:
- Reduced hunger and food cravings, especially for high-fat and high-sugar foods
- Feeling fuller after eating less food
- Loss of interest in foods you previously enjoyed
- Nausea (very common, especially at higher doses like 10mg or 15mg) — eating smaller, more frequent meals can help
- Changes typically develop within 1–2 weeks after starting or increasing your Mounjaro dose
These changes are temporary and normalise over time. Your GP or prescriber can provide personalised dietary advice based on your individual response. Use our free GLP-1 weight loss calculator to see projected outcomes at different Mounjaro doses.
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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.
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NHS-Aligned Meal Planning Strategies for Mounjaro
The NHS recommends a balanced approach to weight loss: focus on nutrient-dense foods rather than strict calorie counting. While taking Mounjaro, your reduced appetite naturally creates the calorie deficit needed for weight loss. Prioritise lean proteins (chicken, fish, eggs), vegetables, whole grains, and healthy fats to support satiety and nutrition. Eat slowly — Mounjaro slows gastric emptying, so eating fast may cause discomfort or nausea.
Practical meal planning tips:
- Eat 3 smaller meals plus 1–2 light snacks daily, rather than forcing full-size portions
- Include protein with every meal — it supports fullness and muscle preservation during weight loss
- Stay hydrated with water and herbal tea — sometimes thirst is mistaken for hunger
- Avoid high-fat, high-sugar, and spicy foods if experiencing nausea
- Track your meals using our free progress tracker to identify patterns and adjust as needed
- 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 when taking Mounjaro?
Focus on balanced meals with lean protein, vegetables, whole grains, and healthy fats. Since Mounjaro reduces appetite, you'll naturally eat smaller portions. Avoid high-fat and high-sugar foods if you experience nausea. NHS guidance recommends nutrient-dense foods over strict calorie restriction. Your GP can provide personalised dietary advice for your specific health needs.
Will Mounjaro suppress my appetite completely?
Mounjaro significantly reduces appetite in most people, but you won't lose the ability to eat. Instead, you'll feel satisfied with smaller portions and lose interest in less healthy foods. Appetite suppression typically develops within 1–2 weeks of starting or increasing your dose. Individual responses vary — some people experience stronger appetite reduction than others.
Can I eat normally while taking Mounjaro?
You can eat the same foods, but portion sizes will be much smaller due to Mounjaro's appetite-reducing effects. This is actually the benefit — you naturally eat less without feeling hungry or deprived. If nausea occurs (a common side effect), eat smaller meals more frequently and avoid high-fat or spicy foods until symptoms settle.
How does Mounjaro compare to Wegovy for meal planning?
Both Mounjaro and Wegovy are GLP-1-based weight loss injections available in the UK, and both reduce appetite similarly. Mounjaro is a dual GIP and GLP-1 agonist (versus Wegovy's single GLP-1 mechanism), and in trials showed slightly higher average weight loss. Meal planning strategies are essentially identical for both — eat smaller portions of nutritious foods. Your prescriber will advise which is more suitable for you.
Should I follow a specific diet while on Mounjaro?
There's no single "Mounjaro diet." The NHS recommends a balanced, reduced-calorie approach alongside lifestyle changes. Since Mounjaro naturally reduces your appetite, you'll create a calorie deficit without strict dieting. Focus on whole foods, adequate protein, and staying hydrated. Work with your GP or a registered dietitian for personalised meal planning based on your health conditions and weight loss goals.
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.