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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How Much Protein Should You Eat Daily On Mounjaro?
When taking Mounjaro (tirzepatide), appetite changes mean many people naturally eat smaller portions — but protein intake remains just as important. There's no single "Mounjaro protein amount" because individual needs depend on your weight, activity level, and muscle preservation goals. This guide explains how to maintain adequate protein intake while using this prescription-only weight management injection, and how to balance nutrition alongside reduced appetite. Always consult your GP or prescriber about your personal dietary needs, especially if you're on other medications or have specific health conditions.
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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.
Protein Requirements While Taking Mounjaro
General protein recommendation: UK health guidelines suggest approximately 0.8g of protein per kilogram of body weight as a baseline for sedentary adults, but this increases significantly if you're exercising or want to preserve muscle during weight loss.
When taking Mounjaro, many people report reduced appetite and smaller meal portions — this makes hitting protein targets harder if you're not strategic. A practical target for weight loss: aim for 25–35g of protein per meal, or 1.2–1.6g per kg of body weight daily if you're exercising regularly. This helps preserve lean muscle mass, which is crucial during gradual weight management.
- Sedentary: 0.8g per kg body weight
- Light exercise: 1.2g per kg body weight
- Regular strength training: 1.6–2.0g per kg body weight
Example: A 70kg adult doing regular exercise would aim for 84–112g protein daily. With Mounjaro-induced appetite reduction, this means choosing protein-rich foods strategically — eggs, Greek yoghurt, lean meat, fish, lentils, tofu — rather than relying on volume.
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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.
Managing Nutrition With Mounjaro's Appetite Changes
Mounjaro works as a dual GIP and GLP-1 receptor agonist, which means it reduces hunger signals and slows stomach emptying — helping you feel fuller longer. This is beneficial for weight loss, but it can make meeting nutritional targets harder if you're not eating enough.
Practical nutrition tips: Prioritise nutrient-dense foods over volume. A smaller portion of salmon with vegetables provides more protein and micronutrients than a larger portion of less nutritious food. Consider protein supplements — a shake or powder can help you reach daily targets without feeling overfull. Track your intake for the first few weeks using MyFitnessPal or similar apps to understand your actual consumption versus your target.
If you're experiencing severe nausea, constipation, or difficulty eating enough protein, speak to your GP or the prescriber who issued your Mounjaro prescription. They may adjust your dose or suggest alternative strategies.
- 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 take Mounjaro without eating enough protein?
No — inadequate protein during weight loss leads to muscle loss alongside fat loss, which slows your metabolism and makes long-term weight maintenance harder. Mounjaro reduces appetite, but this makes strategic protein intake even more important, not less. Aim to prioritise protein in whatever you do eat.
Does tirzepatide affect how your body uses protein?
Mounjaro doesn't directly affect protein metabolism, but it slows gastric emptying (how quickly food leaves your stomach), which may slightly delay protein digestion. This shouldn't significantly impact your overall protein utilisation, but spacing protein intake across meals helps rather than consuming large amounts in one sitting.
Is 30g of protein per meal enough on Mounjaro?
For most adults, yes — 25–35g per meal is a practical target and achieves daily protein goals if spread across three meals. If you're doing regular strength training or are a heavier individual, aim toward the higher end. Use our free GLP-1 weight loss calculator to estimate your weight loss projections and speak to your prescriber about personalised nutrition guidance.
Should I use protein shakes on Mounjaro?
Protein shakes can be very helpful when appetite is suppressed — they provide protein without requiring you to eat large volumes. Choose shakes with minimal added sugar, and sip rather than gulp to avoid nausea. Some people find protein shakes easier to tolerate than solid food while on tirzepatide.
What if I feel too full to eat enough protein?
Contact your prescriber — persistent difficulty eating may indicate your Mounjaro dose is too high, and a dose adjustment might help. In the meantime, focus on smaller, more frequent protein-rich snacks: Greek yoghurt, cheese, nuts, boiled eggs, or protein shakes rather than trying to eat large protein portions.
Ready to take control of your weight loss journey?
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