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?
Feeling hungry while taking Mounjaro (tirzepatide) isn't uncommon — it can happen at lower doses, during the adjustment phase, or if your dose needs increasing. Mounjaro works by activating GIP and GLP-1 hormone pathways to help reduce appetite, but individual responses vary significantly. If you're experiencing persistent hunger, it's important to understand whether your dose is right for you and how to access Mounjaro affordably in the UK through both NHS and private routes.
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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 Hunger and Dose Titration in the UK
Feeling hungry on Mounjaro typically indicates one of two situations: you're still in the early adjustment phase (the first 4–8 weeks), or your current dose isn't optimal for your individual needs. Dose titration with Mounjaro is gradual — you start at 2.5 mg and increase every 4 weeks to 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg (the maximum dose). Many people experience the appetite-suppressing effects more strongly as they escalate doses.
It's also worth noting that hunger can be psychological rather than physiological — stress, boredom, or routine eating patterns may trigger the sensation even when your body doesn't need food. Additionally, if you're not eating a balanced, reduced-calorie diet alongside Mounjaro, the medication's effects may feel less pronounced. If persistent hunger continues after reaching a stable dose, discuss this with your prescriber — they may suggest dose optimisation or assess whether Mounjaro is the right choice for you.
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.
UK Cost & Access: NHS vs Private Mounjaro
NHS access: Mounjaro is approved by NICE for use within NHS specialist weight management services (tier 3), but access is limited and regional. You'll need a GP referral to a specialist service, and waiting lists can be very long in many areas — sometimes 6–12 months or longer depending on your local integrated care board (ICB). Cost to you: free at point of use if approved.
Private access: Available through GPhC-registered online prescribing services following an online clinical assessment. Costs typically range from £129–£200+ per month depending on dose — a 2.5 mg pen (4-week supply) costs approximately £129–£150, whilst a 15 mg pen costs £200–£250. Private prescriptions are faster (often approved within 48 hours) and don't require an NHS referral. No pharmacy name should influence your choice — compare prescriber credentials, support, and total cost per dose instead.
The online consultation process for private Mounjaro is straightforward: you complete a health questionnaire, have a video or phone consultation with a UK-licensed prescriber, and if approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. Before starting, ensure you meet UK eligibility criteria: BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. For those of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds apply. Our GLP-1 weight loss calculator can help you estimate potential results at different doses, and our BMI calculator confirms whether you meet eligibility criteria.
- 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 increasing my Mounjaro dose help if I'm still hungry?
Possibly. Most people experience stronger appetite suppression at higher doses — many notice a significant difference between 5 mg and 10 mg, or between 10 mg and 15 mg. However, individual responses vary, and some people plateau at their current effect level. Discuss dose escalation with your prescriber; they can assess whether increasing is appropriate for you.
Can I get Mounjaro on the NHS without a long wait?
NHS access through tier 3 specialist weight management services is available but limited by regional capacity and waiting lists. Some areas have shorter waits than others. Your GP can refer you to your local service to check availability. Private prescribing is typically faster (48 hours to approval) if you want quicker access.
What's the difference between Mounjaro and Wegovy for hunger?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, whilst Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials show Mounjaro may produce slightly greater average weight loss (~20.9% vs ~14.9%), though hunger suppression varies individually. Both require prescriptions and are available via NHS or private routes.
How much does a month's supply of Mounjaro cost privately in the UK?
Prices vary by dose and provider, typically ranging from £129–£250 per month. A 2.5 mg pen costs around £129–£150, whilst a 15 mg pen costs approximately £200–£250. Compare total cost per dose across providers rather than focusing on any single pharmacy name.
What happens if I stop Mounjaro — will hunger return immediately?
Appetite typically gradually returns over weeks to months after stopping Mounjaro, not immediately. Many people maintain some weight loss benefit and continue weight management through diet and exercise. Discuss any decision to stop with your prescriber, as they can advise on the safest approach for your individual circumstances.
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.