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
Overeating on Mounjaro — Managing Appetite Control
If you're experiencing increased hunger or overeating while taking Mounjaro (tirzepatide), you're not alone — appetite response varies significantly between individuals. This guide explains why appetite suppression may decrease, how dose titration works, and what to do if you're not seeing the expected appetite control benefits. We'll cover both NHS and private access routes so you understand your options in the UK.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Why Appetite Suppression May Decrease on Mounjaro
Mounjaro is a dual GIP and GLP-1 receptor agonist designed to reduce appetite and support feeling fuller after smaller meals. However, appetite suppression is not assured, and some individuals experience reduced effectiveness over time — a phenomenon sometimes called "appetite adaptation".
Common reasons for overeating on Mounjaro include:
- Early doses (2.5 mg–5 mg) may not provide sufficient appetite suppression for some individuals
- Your body may adapt to the medication over weeks or months
- Psychological eating habits and emotional triggers may override the medication's effects
- Underlying conditions affecting appetite regulation (PCOS, thyroid issues) may reduce effectiveness
- Medications you're taking may interact with appetite signals
- Individual metabolic differences mean some people respond less strongly to tirzepatide
The Mounjaro dose titration schedule allows for gradual increases (from 2.5 mg to 15 mg maximum) precisely to help find your optimal dose. If you're overeating at your current dose, discussing dose escalation with your prescriber may help.
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.
What to Do if Mounjaro Isn't Controlling Your Appetite
If you're experiencing overeating despite being on Mounjaro, contact your prescriber immediately — this is a legitimate clinical concern, not a personal failing. Your prescriber can assess whether you're at the right dose for your individual response and may recommend escalation to the next therapeutic level.
In the meantime, practical strategies include keeping a food diary (try our free progress tracker), eating more protein and fibre to enhance satiety, drinking water before meals, and eating slowly in distraction-free environments. These complement medication rather than replace it. It's also important to rule out emotional eating or boredom-driven eating, which medication cannot address alone. If overeating persists despite dose optimisation, your GP or prescriber may recommend additional support from a dietitian or behavioural health specialist.
- 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.
Can I increase my Mounjaro dose if I'm still overeating?
Yes — discuss with your prescriber. Mounjaro doses escalate every 4 weeks (2.5 mg → 5 mg → 7.5 mg → 10 mg → 12.5 mg → 15 mg maximum). If appetite control is inadequate at your current dose, moving to the next level may help. Each person's optimal dose differs. Your prescriber will assess your response and any side effects before escalating.
Is overeating on Mounjaro a sign the medication isn't working?
Not necessarily. Mounjaro supports appetite reduction, but it's not a assures. Individual response varies significantly. Some people need higher doses; others may require additional behavioural support. Talk to your prescriber if appetite control feels inadequate — they can review your dose and overall approach to weight management.
How long does it take for Mounjaro appetite suppression to kick in?
Most people notice reduced appetite within 2–4 weeks of starting. However, some experience effects as early as days 3–5, whilst others take 6–8 weeks. You're typically kept on each dose for a minimum of 4 weeks before escalating, allowing time to assess your individual response and tolerance.
What if overeating continues even at the maximum Mounjaro dose?
If appetite control remains poor at 15 mg (maximum dose), discuss with your prescriber. Options might include: ensuring you're following a structured reduced-calorie diet alongside the injection; assessment for underlying conditions affecting appetite; referral to a dietitian or psychologist; or, in some cases, exploring alternative treatments with your healthcare team.
Does emotional eating override Mounjaro's appetite suppression?
Yes. Mounjaro reduces physical hunger signals, but psychological eating (stress, boredom, habit) operates through different brain pathways. Medication alone cannot address emotional eating — behaviour change strategies, mindfulness, or cognitive behavioural therapy may be needed alongside pharmaceutical support.
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.