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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Mounjaro Cravings Coming Back — How It Compares to Wegovy
If you're experiencing cravings returning while on Mounjaro, you're not alone — appetite control can vary between individuals, and this is an important conversation to have with your prescriber. Mounjaro and Wegovy work through different mechanisms: Mounjaro is a dual GIP and GLP-1 receptor agonist, while Wegovy activates only the GLP-1 pathway. Understanding these differences can help explain why cravings may return at certain doses or times, and whether a dose adjustment or medication switch might be suitable for your situation. This guide compares how both medications address appetite regulation and what the clinical evidence shows about managing returning cravings.
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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.
Mechanism Differences: Why Cravings May Return
Mounjaro (tirzepatide) and Wegovy (semaglutide) use different biological pathways to reduce appetite. Mounjaro activates two hormone receptors: GIP (glucose-dependent insulinotropic polypeptide) and GLP-1 (glucagon-like peptide-1). This dual mechanism may provide stronger appetite suppression initially. Wegovy activates only GLP-1, which also reduces hunger but through a single pathway.
In clinical trials, SURMOUNT (Mounjaro) showed average weight loss of 15–21% at maximum dose, while STEP (Wegovy) showed approximately 15% at 2.4mg. However, individual responses vary significantly. Cravings returning can occur with either medication if your body adapts to the dose, if you're not at the optimal dose for you personally, or if lifestyle factors have shifted. Your prescriber may recommend a dose increase, dietary adjustments, or exploring an alternative tirzepatide if appetite control has diminished.
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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.
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When Cravings Return: Assessment and Options
Returning cravings often signal that a dose adjustment may be needed. If you're on a lower Mounjaro dose (5mg or 7.5mg), your prescriber may increase to 10mg, 12.5mg, or the maximum 15mg. Timing matters: each dose typically takes 4–6 weeks to reach full effect, so premature cravings during dose escalation are common and usually temporary.
If appetite control has plateaued at your current maximum dose, this is worth discussing with your prescriber. Options include continuing at the current dose with increased focus on nutrition and activity, or exploring whether a switch to Wegovy or another approach suits your circumstances better. Use our free GLP-1 weight loss calculator to track your progress and identify patterns—this data is valuable for your prescriber conversation. Weight loss medications work best alongside dietary consistency and physical activity; returning cravings may also reflect lifestyle changes that need reinforcing.
- 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 are my cravings coming back on Mounjaro when they weren't before?
Appetite suppression can diminish as your body adapts to the medication, or you may not yet be at your optimal dose. Each person responds differently. Returning cravings are common during dose escalation, and they typically settle as the new dose takes full effect over 4–6 weeks. If cravings persist at your current dose, a dose increase or lifestyle review with your prescriber is advisable.
Is Wegovy better than Mounjaro for appetite control?
Clinical trials show similar appetite-reducing effects, with average weight loss comparable between the two (Mounjaro ~15–21%, Wegovy ~15%). The difference is individual—some people respond better to Mounjaro's dual GIP+GLP-1 mechanism, others to Wegovy's single GLP-1 pathway. Your prescriber assesses which is most suitable based on your health profile and response.
Should I switch from Mounjaro to Wegovy if cravings are returning?
Not necessarily—a dose increase or dietary adjustment is often the first step. However, if you're at maximum Mounjaro (15mg) and appetite control is inadequate, switching to Wegovy is a valid option your prescriber may consider. Any medication change requires clinical assessment and should be managed by your prescriber.
Can I use MyWeightCheck tools to track if my cravings are worsening?
Yes. Our free progress tracker lets you log your weight weekly and note patterns like appetite levels or cravings. This data helps you and your prescriber identify whether cravings are truly returning or influenced by lifestyle factors like stress, sleep, or activity level. Tracking also shows whether dose increases are helping.
How long does it take for a Mounjaro dose increase to reduce cravings again?
Each dose increase typically takes 4–6 weeks to reach full effect. You may notice appetite suppression returning within 1–2 weeks, but full benefit is usually evident by week 6. Keep consistent with diet and activity during this window—the medication works best alongside lifestyle adherence, not as a substitute for it.
Ready to take control of your weight loss journey?
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