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
Do You Still Feel Hungry On Mounjaro?
Yes, many people still feel hungry whilst taking Mounjaro, even at higher doses. Mounjaro (tirzepatide) is not an appetite eliminator — it's a medication that may help reduce appetite and support feeling fuller after smaller meals. How much hunger you experience varies significantly between individuals, and it often decreases over the first 8–12 weeks as your body adjusts to the medication. Understanding what to expect can help you work effectively with your prescriber and manage your weight loss journey.
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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 Hunger and Appetite
Mounjaro works as a dual GIP and GLP-1 receptor agonist, which means it activates two natural hormone pathways that regulate appetite and blood sugar control. Rather than eliminating hunger entirely, it typically works by:
- Reducing appetite signals — helping you feel less driven to eat
- Increasing fullness — making smaller portions feel more satisfying
- Slowing gastric emptying — food stays in your stomach longer, promoting satiety (though this effect often reduces over time)
- Supporting food cravings management — particularly for high-calorie or sweet foods
Clinical trial data showed that at the maximum dose of 15 mg, participants experienced an average weight loss of approximately 20.9% of their body weight. However, individual experiences vary widely. Some people report minimal hunger on Mounjaro; others continue to feel hungry and must rely on portion control and mindful eating. Your prescriber may adjust your tirzepatide dose based on your response and how you tolerate the medication.
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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.
Why Some People Still Feel Hungry On Mounjaro
Several factors influence how much hunger you experience on Mounjaro:
- Individual biology — some people's bodies respond more strongly to GIP and GLP-1 signalling than others
- Current dose — hunger often decreases as your dose increases, but not everyone reaches appetite suppression even at 15 mg
- Psychological hunger — Mounjaro addresses physical hunger signals, not emotional eating or habit-based eating patterns
- Underlying conditions — if you have a history of binge eating or disordered eating, medication alone may not address these patterns
- Lifestyle factors — stress, sleep quality, and physical activity all influence hunger and satiety
If you're still experiencing significant hunger after 8–12 weeks on your current dose, speak to your prescriber. They may increase your dose gradually or discuss whether Mounjaro is the right fit for your individual needs. Use our free weight loss calculator to explore projected outcomes at different doses.
- 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.
Is it normal to feel hungry on Mounjaro?
Yes, it's completely normal. Mounjaro is not designed to eliminate hunger entirely — it reduces appetite signals and supports feeling fuller after smaller meals. Most people experience some degree of hunger, and this varies widely between individuals. If hunger is severe or worsening, inform your prescriber.
How long does it take for Mounjaro to reduce hunger?
Most people notice reduced appetite within the first 2–4 weeks. However, the effect often continues to build over the first 8–12 weeks as your body adjusts and you titrate to higher doses. Individual timelines vary significantly. Keep a food and hunger diary to track changes.
Can I increase my Mounjaro dose if I'm still hungry?
Only your prescriber can adjust your dose. Standard protocol is to increase by 2.5 mg every 4 weeks, up to a maximum of 15 mg weekly. Higher doses typically produce stronger appetite suppression, but not everyone experiences significant hunger reduction even at maximum dose. Speak to your prescriber about your experience.
Does Mounjaro work differently than Wegovy for hunger?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, whilst Wegovy (semaglutide) activates GLP-1 alone. The dual mechanism may support stronger appetite suppression for some people, though clinical trial results show similar average weight loss. Individual responses vary — some find Mounjaro more effective, others prefer Wegovy.
What should I do if Mounjaro isn't reducing my hunger?
First, ensure you're at an adequate dose (typically 10 mg or higher for weight management) and have been on your current dose for at least 4 weeks. Consider whether emotional or habit-based eating may be involved — medication addresses physical hunger, not psychological triggers. Discuss with your prescriber whether continuing, adjusting dose, or trying an alternative approach is appropriate.
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.