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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Why Am I Still Hungry on Mounjaro?
If you're on Mounjaro (tirzepatide) but still experiencing hunger or appetite control isn't improving as expected, you're not alone — and there are several reasons why this can happen. Mounjaro works differently for each person, and persistent hunger can be addressed through dose adjustment, lifestyle factors, or medical review with your prescriber. This guide explains what might be happening and what your NHS or private prescriber can do to help.
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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.
Why Mounjaro May Not Be Suppressing Hunger as Expected
Several factors can affect how well Mounjaro controls appetite. Dose timing is crucial — you may still be on an insufficient dose during the titration phase (doses start at 2.5 mg and increase every 4 weeks). Most people report significant appetite suppression at 10 mg or higher, though individual responses vary widely. Dietary habits also matter: if you're eating very quickly, not drinking enough water, or consuming high-calorie foods with little nutritional value, you may not feel full despite the medication. Additionally, stress, poor sleep, and hormonal factors can override the appetite-suppressing effects of tirzepatide. Some people find that their body adapts slightly over time, requiring either a dose increase or reinforced lifestyle changes. Your prescriber — whether through NHS tier 3 services or private prescription — should assess these factors before adjusting your dose.
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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 Your Prescriber Can Do & When to Seek Help
If hunger isn't being controlled, your prescriber can review several options. Dose escalation is the first step — if you're below 10 mg, increasing your dose may significantly improve appetite suppression. Each dose increase requires a minimum of 4 weeks before moving to the next level. Your prescriber may also explore whether other medications or medical conditions are interfering (such as diabetes medications or thyroid issues). Food intake monitoring, hydration, and meal timing adjustments can also make a meaningful difference. If you're on Mounjaro through an NHS specialist weight management service, discuss your experience at your next appointment. If you're using private prescription, contact your prescriber immediately — they can adjust your plan based on your feedback.
- 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 still feeling hungry on Mounjaro normal?
Yes, especially if you're still in the titration phase (below 10 mg) or within the first 8–12 weeks of starting. Mounjaro takes time to reach full appetite suppression, and responses vary. However, persistent hunger at maximum dose (15 mg) warrants a discussion with your prescriber about dose timing, lifestyle factors, or potential medication interactions.
Could I need a higher dose if Mounjaro isn't working?
Possibly. Mounjaro doses range from 2.5 mg to 15 mg, with most people experiencing significant appetite suppression at 10 mg or higher. Your prescriber will only increase your dose if you've been on your current dose for at least 4 weeks without adequate appetite control. Individual tolerance and response vary, so dose adjustment is personalised.
What lifestyle changes help if Mounjaro alone isn't suppressing hunger?
Eat slowly and mindfully — Mounjaro slows gastric emptying, so rushing defeats the medication's effect. Stay well-hydrated (often thirst is mistaken for hunger). Eat protein and fibre-rich foods, which enhance fullness. Avoid high-calorie, low-nutritional-value foods. Address sleep and stress, which can trigger hunger hormones. These changes complement medication, not replace it.
Should I switch to Wegovy if Mounjaro isn't controlling my hunger?
Not necessarily. Mounjaro is a dual GIP and GLP-1 agonist, while Wegovy is a GLP-1-only medication. Mounjaro often provides stronger appetite suppression at equivalent doses. Switching would only be considered if your prescriber determines it's appropriate, usually after optimising your current dose and lifestyle.
How long should I give Mounjaro before deciding it's not working?
Most people report noticeable appetite changes within 2–4 weeks, but full effect may take 8–12 weeks. If you're below your target dose, wait until you've reached an appropriate maintenance dose (typically 10–15 mg) before concluding it's ineffective. Discuss timing with your prescriber — they can advise based on your individual response.
Ready to take control of your weight loss journey?
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