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
Can You Feel Hungry On Mounjaro? Appetite Changes Explained
Yes, you can still feel hungry while taking Mounjaro, though most people experience reduced appetite. Mounjaro (tirzepatide) works by activating GLP-1 and GIP receptors, which help signal fullness to your brain — but hunger isn't completely eliminated. How much appetite changes varies between individuals. Some people report minimal hunger on higher doses, whilst others notice only modest suppression. Understanding what to expect, and how Mounjaro compares to alternatives like Wegovy, helps you decide if this medication might suit your goals. Your prescriber can discuss individual suitability during a clinical assessment.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Mounjaro vs Wegovy: Hunger and Appetite Suppression
Both Mounjaro and Wegovy reduce appetite, but through slightly different mechanisms. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — it activates two appetite-regulating pathways. Wegovy (semaglutide) is a GLP-1 agonist only, activating a single pathway. In the SURMOUNT-1 clinical trial, Mounjaro participants on the 15 mg dose reported significant appetite reduction. In the STEP-1 trial, Wegovy (semaglutide) at 2.4 mg also showed strong appetite suppression. However, neither medication eliminates hunger completely — you can still feel hungry, especially in the early weeks of treatment or on lower doses.
- Mounjaro: dual mechanism may provide stronger appetite suppression for some people
- Wegovy: single GLP-1 mechanism still effective, but may produce slightly less appetite reduction on average
- Individual response varies — genetics, dose, and baseline metabolism all play a role
- Hunger typically decreases as doses increase during titration
Trial data shows both medications help people feel fuller after smaller meals, but neither makes hunger disappear entirely. Many people still enjoy food and social eating — the change is in portion size and frequency of hunger signals.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 Affects Hunger Levels on These Medications
Several factors influence how much hunger you feel on either medication. Dose level is the strongest factor — higher doses (10–15 mg Mounjaro, 1.7–2.4 mg Wegovy) typically produce more appetite suppression than starting doses. Individual metabolism varies — some people are naturally more sensitive to GLP-1 signalling. Diet quality matters too; protein-rich foods help maintain satiety longer. Timing of food affects hunger — eating smaller, frequent meals works better than skipping meals then eating large portions.
Your GP or prescriber can discuss dose titration and dietary strategies during your clinical assessment. Using our free GLP-1 weight loss calculator can help you explore projected outcomes at different doses, which your prescriber may reference when personalising your treatment plan.
- 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.
Does Mounjaro completely stop you feeling hungry?
No. Mounjaro reduces appetite and helps you feel fuller after smaller meals, but you can still experience hunger — especially on lower doses or early in treatment. Complete appetite elimination is not typical and would not be healthy. Most people report feeling less interested in food and satisfied with smaller portions rather than no hunger at all.
Is Wegovy or Mounjaro better for appetite suppression?
Both are effective, but individual response varies. Mounjaro's dual GIP+GLP-1 mechanism may produce slightly stronger appetite suppression for some people, while Wegovy's single GLP-1 mechanism is also proven effective. Your prescriber will assess which is more suitable based on your health profile and medical history. Results differ from person to person.
When does appetite suppression start on Mounjaro?
Many people notice reduced appetite within 1–2 weeks of starting Mounjaro, though it typically increases as you progress through dose titration. The 2.5 mg starting dose produces modest appetite reduction; most significant changes occur at 7.5 mg and above. Appetite suppression may stabilise or slightly decrease after several months on a stable dose.
Can you feel hungry again after being on Mounjaro?
Yes. Some people report that appetite suppression plateaus or slightly reduces after months on a stable dose. This is sometimes called "tolerance" though it's not a true pharmacological tolerance — your body adjusts to the medication. Your prescriber may adjust your dose if appetite increases or weight loss plateaus.
What should I eat if I'm still hungry on Mounjaro?
Focus on protein-rich foods (chicken, fish, eggs, legumes), fibre (vegetables, whole grains), and water. These support satiety longer than simple carbohydrates. Eating smaller, frequent meals helps some people. Your GP or a dietitian can provide personalised advice. Staying hydrated and managing eating pace (eating slower) also helps maximise fullness signals.
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.