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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I'm Still Hungry on Mounjaro — What This Means
If you're still experiencing significant hunger while taking Mounjaro, you're not alone — and this doesn't automatically mean the medication isn't working. Appetite suppression is one of Mounjaro's mechanisms, but individual responses vary considerably. This guide explains why some people continue to feel hungry, what this might indicate about your treatment, and what steps to take with your NHS or private prescriber to optimise your dose or approach.
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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 Hunger Persists on Mounjaro — Common Reasons
Not all hunger is the same. Some people on Mounjaro experience reduced appetite from day one, while others notice minimal change in how hungry they feel — yet still lose weight. This happens because Mounjaro works through multiple mechanisms: it doesn't just suppress appetite, it also affects how quickly your stomach empties, influences blood sugar stability, and changes how your brain responds to fullness signals.
Common reasons you might still feel hungry include: you're on a sub-optimal dose (appetite suppression often increases with higher doses during titration), you're in the early weeks (full effects can take 4+ weeks to develop), you're eating too quickly (Mounjaro works best when you eat slowly and mindfully), you're consuming high-calorie foods (liquid calories, oils, and dense foods bypass some satiety signals), or you're experiencing psychological hunger rather than physical hunger (cravings, boredom, habit eating). Your GP or prescriber should explore these factors during your clinical review.
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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.
Next Steps — Dose Adjustment and NHS Guidance
If you're experiencing persistent hunger, contact your prescriber before the next scheduled dose — do not increase your dose yourself. Your GP or the specialist team prescribing your Mounjaro through an NHS tier 3 weight management service can review your response and consider whether a dose increase is appropriate. The standard titration schedule moves to a higher dose every 4 weeks, but individual timing may vary. If you're on a maintenance dose and still struggling with hunger, your team might suggest behavioural strategies (mindful eating, structured meal timing, protein-focused meals), or in some cases, a switch to an alternative medication like tirzepatide or Wegovy if clinically suitable.
Track your weight loss progress using our free progress tracker alongside detailed hunger and mood notes — this gives your prescriber valuable information about whether the medication is working even if appetite suppression feels minimal.
NHS vs Private Mounjaro Prescribing in the UKAccess to Mounjaro in the UK depends on your route: NHS prescribing is through specialist tier 3 weight management services (typically in hospital outpatient clinics), where your prescriber will conduct regular clinical reviews and manage any side effects or concerns including ongoing hunger. Private prescribing through GPhC-registered online services involves initial online consultation followed by follow-up reviews. In both cases, you can and should raise concerns about hunger, appetite control, or lack of weight loss at your clinical reviews. Your prescriber may also recommend using our GLP-1 weight loss calculator to project potential outcomes at different doses, which can help guide decisions about dose escalation.
- 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.
Why does Mounjaro work for some people's appetite but not mine?
Individual response to Mounjaro varies due to genetics, baseline gut hormone levels, how quickly you absorb the medication, your current diet, and psychological eating patterns. Some people experience dramatic appetite suppression; others experience modest changes in satiety but still lose weight through slower gastric emptying and improved blood sugar control. Neither response is "wrong" — it's individual variation.
Should I increase my Mounjaro dose because I'm still hungry?
No — never adjust your dose yourself. Contact your prescriber if hunger is persistent. They will assess whether you're on a sub-optimal dose, whether you've been on your current dose long enough for full effects to develop, or whether a different medication might suit you better. Dose increases are done under clinical supervision.
Can I combine Mounjaro with another appetite suppressant if I'm still hungry?
Combining medications requires clinical assessment and is not routine. Discuss this explicitly with your GP or specialist prescriber. In some cases, addressing eating behaviours, meal timing, or food choices may be more effective than additional medication. Your prescriber will advise based on your individual situation.
Does continuing hunger mean Mounjaro isn't working for weight loss?
No — appetite suppression is not the only mechanism of Mounjaro. Even without dramatic hunger reduction, the medication can slow gastric emptying, improve blood sugar stability, and reduce overall calorie intake. Check your actual weight loss using our BMI calculator and weight converter to track real progress rather than relying on hunger levels alone.
What should I tell my NHS or private prescriber about my ongoing hunger?
Describe: when you feel hungry (between meals, during meals, specific times of day), whether it feels like physical hunger or cravings, how long you've been on your current dose, what foods trigger the most hunger, and whether you're losing weight despite the hunger. Bring food diary notes if possible. This information helps your prescriber decide whether to adjust your dose, modify your approach, or consider alternatives.
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.