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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Do You Still Get Hungry On Mounjaro?
Most people taking Mounjaro (tirzepatide) experience a significant reduction in appetite and hunger, particularly as their dose increases. However, the degree of appetite suppression varies between individuals, and some people may still experience normal hunger at lower doses or earlier in their treatment. This guide explains how Mounjaro affects hunger, what the clinical evidence shows, and what to realistically expect during your NHS or private prescription journey in the UK.
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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.
How Mounjaro Affects Appetite and Hunger
Mounjaro works as a dual GIP and GLP-1 receptor agonist, which means it activates two natural hormone pathways that regulate appetite and satiety. These hormones signal to your brain that you feel full, reducing the desire to eat and helping you feel satisfied with smaller meal portions.
The appetite-suppressing effect typically becomes more noticeable as your dose increases during the dose titration phase (weeks 1–20+). Most people experience:
- Week 1–4 (2.5 mg): minimal appetite change
- Week 5–8 (5 mg): noticeable reduction in hunger
- Week 9+ (7.5 mg and above): significant appetite suppression for many
However, hunger suppression is not assured at every dose, and some individuals experience stronger effects than others. Clinical trials showed that on average, people taking Mounjaro reported feeling fuller after smaller meals and having fewer food cravings—but individual responses vary significantly. Use our free GLP-1 weight loss calculator to explore how appetite changes might affect your projected weight loss at different 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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
What the Evidence Shows and What to Expect
In the SURMOUNT-1 clinical trial, participants on Mounjaro reported reduced hunger and increased fullness across all doses. However, complete appetite suppression is not the goal or expected outcome. You may still experience normal hunger at mealtimes, particularly at lower doses (2.5 mg or 5 mg) or if you've been on the same dose for several weeks as your body adapts.
Some people also experience appetite rebound as their body adjusts to the medication, meaning hunger may return to more normal levels over time. This is why Mounjaro is most effective when combined with lifestyle changes—reduced-calorie diet and increased physical activity—rather than relying on appetite suppression alone. If you're struggling with hunger or feel the medication isn't working, speak to your GP or prescriber, as your dose may need adjusting or a review of your individual treatment plan may be 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.
Will Mounjaro completely stop me from feeling hungry?
No. Most people experience reduced hunger and increased fullness, but not complete appetite suppression. You'll likely still feel normal hunger at mealtimes, especially at lower doses. The goal is to help you eat smaller portions and feel satisfied more easily, not to eliminate hunger entirely.
At what Mounjaro dose does hunger reduction become noticeable?
Most people notice appetite changes around the 5 mg dose (weeks 5–8), with more significant suppression at 7.5 mg and above. However, individual responses vary. Some people notice changes at 2.5 mg, whilst others may need higher doses. Your prescriber will adjust your dose gradually to find what works for you.
Does the appetite suppression from Mounjaro wear off over time?
Yes, for some people. Your body may adapt to the medication, and hunger can gradually return to more normal levels, particularly if you remain on the same dose for several months. This is normal and doesn't mean the medication has stopped working—your prescriber may adjust your dose if needed.
What should I do if I'm still very hungry on Mounjaro?
Speak to your GP or prescriber. You may benefit from a higher dose (if you're not yet at maximum), or they may review whether the medication is right for you. Remember that Mounjaro works best alongside calorie reduction and physical activity, not as a standalone solution for weight management.
Can I check my progress and projected appetite changes with Mounjaro?
Yes. Use our free GLP-1 weight loss calculator above to explore projected weight loss at different Mounjaro doses based on clinical trial data. For tracking actual weight loss and hunger changes over time, our free progress tracker can help you log your journey week by week.
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.