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 Still Feel Hungry On Mounjaro?
Yes, many people still experience some hunger while taking Mounjaro, though it's typically reduced compared to before treatment. Mounjaro (tirzepatide) works by activating GIP and GLP-1 hormone pathways, which signal fullness to your brain and slow stomach emptying — but individual responses vary significantly. Some users report near-complete appetite suppression, while others feel moderately reduced hunger. Your personal experience depends on your starting dose, how your body responds, and your individual metabolism. This guide explains what to expect and how to access Mounjaro affordably in the UK through 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.
How Mounjaro Affects Hunger — And UK Prescription Costs
Mounjaro's appetite-suppressing effect builds gradually as your dose increases. Starting at 2.5 mg, most people notice mild appetite reduction by weeks 3–4. By the time you reach your maintenance dose (typically 10 mg or 15 mg), the hunger-suppressing effect is usually most pronounced — though complete loss of appetite is not assured. Individual variation is significant: some people report eating only small portions and forgetting meals, whilst others still feel regular hunger cues but find portion control easier.
- NHS access: Free through specialist tier 3/4 weight management services (but waiting lists vary by region)
- Private prescription cost: Typically £129–£320 per month depending on dose, with some variation between GPhC-registered online providers
- NHS vs private: NHS availability is extremely variable — some regions have long waiting lists (6–12+ months), making private prescription a faster alternative
The tirzepatide KwikPen is delivered monthly as pre-filled pens. Private online consultations take 24–48 hours, and prescriptions are dispensed by regulated UK pharmacies. Most private providers require a repeat online assessment every 3 months.
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.
Accessing Mounjaro In The UK: NHS And Private Routes
NHS route: Request a referral from your GP to a specialist weight management service (tier 3). Your local Integrated Care Board determines eligibility and waiting time — this can range from immediate assessment to 12+ months depending on demand and resources. Once approved, Mounjaro is free on prescription.
Private route: Online consultation with a UK-licensed prescriber (takes 24–48 hours), followed by prescription dispensing by a GPhC-registered pharmacy. Cost typically ranges from £129–£320 monthly depending on your dose. No NHS referral needed. Use our GLP-1 weight loss calculator to estimate potential outcomes and help decide if prescription treatment is right for you.
Whichever route you choose, eligibility requires a BMI of 30 or above, or BMI 27–29.9 with a weight-related health condition. Your prescriber will assess suitability based on your individual health profile.
- 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 Mounjaro make me lose my appetite completely?
Not necessarily. Mounjaro reduces appetite for many people, but individual responses vary. Some experience near-total appetite suppression, whilst others feel moderately reduced hunger that makes portion control easier. Hunger typically decreases more as your dose increases. Always use our BMI calculator to track progress alongside appetite changes.
How quickly does hunger reduction happen on Mounjaro?
Appetite suppression typically begins within the first 2–4 weeks at the starting dose (2.5 mg), becoming more pronounced as you titrate upwards. Most people notice the strongest effect by weeks 9–12 when approaching their maintenance dose (10 mg or 15 mg).
What's the difference between NHS and private Mounjaro access in the UK?
NHS Mounjaro is free but requires a GP referral to specialist services and can involve long waiting lists (varies by region). Private prescription is faster (24–48 hours) and doesn't require an NHS referral, but costs around £129–£320 monthly. Both require clinical assessment and a valid prescription.
How does Mounjaro compare to Wegovy for hunger suppression?
Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist, whilst Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials suggest Mounjaro may produce slightly greater weight loss on average, but individual hunger suppression varies similarly between both medications. Your prescriber can discuss which suits you best.
Can I still eat normally if I take Mounjaro?
Mounjaro reduces appetite, making smaller portions feel more satisfying. However, you're not prevented from eating normally — you'll likely feel full sooner and have fewer cravings. Many users find they naturally eat less without struggling, though hunger varies between individuals and doses.
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.