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
Free tracker included with every download this week
Why Am I Still Hungry on Mounjaro?
If you're still experiencing hunger on Mounjaro (tirzepatide), you're not alone — and it doesn't necessarily mean the medication isn't working for you. Appetite suppression on Mounjaro varies between individuals, and there are several reasons why you might still feel hungry, from being on a sub-optimal dose to individual variation in how your body responds. This guide explains what's normal, when to adjust your dose, and how to access Mounjaro in the UK with the right support to find your effective dose.
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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.
Understanding Appetite on Mounjaro and Dose Titration
Mounjaro works by activating GIP and GLP-1 receptor pathways, which naturally suppress appetite — but the degree of appetite reduction varies significantly between individuals. You may still feel hungry on Mounjaro if you're on a lower dose, haven't reached your maintenance dose yet, or if your body simply responds differently to the medication than average.
The dose titration schedule is designed gradually: starting at 2.5 mg weekly, increasing to 5 mg after 4 weeks, then escalating to 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg (the maximum). Many people don't experience full appetite suppression until they reach 10 mg or higher. If you're still hungry after 4 weeks on your current dose, your prescriber may recommend moving to the next dose level.
It's also worth noting that appetite suppression may reduce slightly over time as your body adapts — this is normal and doesn't mean the medication is failing. Your prescriber can assess whether a dose increase is appropriate or whether other factors (diet, activity, medication interactions) are affecting your hunger signals.
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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: NHS vs Private Routes
In the UK, you can access Mounjaro through two routes: NHS specialist services or private prescription via a licensed online prescriber. NHS access is through tier 3 or 4 weight management services (typically via GP referral), but availability varies significantly by region and waiting lists can be lengthy. Private prescriptions are available through GPhC-registered pharmacies after an online clinical assessment with a UK-licensed prescriber.
Costs vary by dose and provider, typically ranging from £120–£300 per month for private prescriptions. Your prescriber will guide dose adjustments based on your response — if you're still hungry, discuss this at your next appointment or during a follow-up consultation. Use our GLP-1 weight loss calculator to explore projected outcomes at different doses, and track your progress with our free progress tracker to monitor appetite changes alongside weight loss.
- 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.
Why is my appetite returning after a few weeks on Mounjaro?
Your body may be adapting to the medication — appetite suppression sometimes reduces slightly over time. This is normal. Alternatively, you may not yet be on your optimal dose. Most people reach peak appetite suppression at 10 mg or above. Discuss dose escalation with your prescriber if you've been on your current dose for 4+ weeks.
Can I jump to a higher Mounjaro dose if I'm hungry?
No — dose increases must follow the recommended titration schedule (4 weeks minimum between dose increases) to minimise side effects and allow your body to adapt safely. Skipping doses or self-escalating increases the risk of serious side effects. Always follow your prescriber's guidance.
What's the difference between Mounjaro and Wegovy for appetite control?
Mounjaro is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro's dual mechanism may provide stronger appetite suppression for some people. However, individual response varies — some people find Wegovy more effective and vice versa. This is a discussion to have with your prescriber.
How much does Mounjaro cost on private prescription in the UK?
Private Mounjaro prescriptions typically cost £120–£300 per month depending on dose (2.5 mg to 15 mg) and the provider. NHS access is free if you're eligible through specialist weight management services, though availability varies by region. Your prescriber can discuss costs and options with you.
Should I change my diet if I'm still hungry on Mounjaro?
Yes — Mounjaro works best alongside a reduced-calorie diet and increased physical activity. Even with appetite suppression, eating nutrient-dense, high-protein foods and staying hydrated can help you feel fuller for longer. Your prescriber or a dietitian can provide personalised dietary guidance tailored to your needs.
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.