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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Why Does Mounjaro Cause Wind and Burping?
Wind and burping are common side effects reported by people taking Mounjaro (tirzepatide) for weight management in the UK. These digestive symptoms happen because of how tirzepatide works in your body — it slows the rate at which food moves through your stomach and affects how your digestive system processes meals. Understanding why this happens and what you can do about it can help you manage the side effect more effectively. Most people find these symptoms improve over time as their body adjusts to the medication.
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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.
How Mounjaro Causes Wind and Burping
Delayed gastric emptying: Mounjaro slows how quickly food leaves your stomach and enters your small intestine. This slower digestion gives bacteria in your gut more time to ferment undigested food, which produces gas — leading to wind, bloating, and burping. This effect is part of how the medication helps reduce appetite, but it also causes these digestive symptoms.
- Gas builds up as food is digested more slowly than usual
- Burping occurs as your body tries to release trapped air
- Bloating and stomach discomfort are common alongside wind
- The effect is usually most noticeable in the first few weeks after starting or increasing your dose
As your body adapts to tirzepatide over several weeks, gastric emptying typically normalises and these symptoms usually improve. Your prescriber may also suggest practical dietary changes to reduce gas production.
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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.
Managing Wind and Burping on Mounjaro
Several practical strategies can help reduce wind and burping while taking Mounjaro:
- Eat slowly and chew thoroughly — smaller bites reduce the amount of air you swallow
- Avoid carbonated drinks — fizzy beverages add extra gas to your digestive system
- Limit foods known to produce gas — beans, lentils, cruciferous vegetables (broccoli, cabbage), and high-fat foods often cause bloating
- Stay hydrated with still water — helps digestion without adding gas
- Take short walks after meals — gentle movement can aid digestion
- Speak to your GP or prescriber — they can advise on over-the-counter remedies or dietary adjustments suited to you
If wind and burping are severe or persistent beyond 8–12 weeks, contact your prescriber — they may adjust your dose or suggest additional support.
- 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.
How long does wind and burping last on Mounjaro?
Wind and burping typically start within the first few days of taking Mounjaro and are usually most noticeable in the first 2–4 weeks. For most people, these symptoms improve significantly by weeks 8–12 as the body adjusts to tirzepatide. However, individual experience varies — some people notice improvement sooner, whilst others may have longer-lasting symptoms.
Is wind and burping a serious side effect of Mounjaro?
Wind and burping are common but not serious. They are your digestive system adjusting to how Mounjaro slows stomach emptying. Unless the symptoms are severe or accompanied by severe pain, they are not medically concerning. If you experience severe stomach pain, contact your GP immediately as this could indicate pancreatitis.
Will wind and burping happen every time I take Mounjaro?
Not necessarily. Many people find that wind and burping are worst after dose increases or during the first few weeks of starting Mounjaro. Once your body adjusts, symptoms often become minimal or disappear entirely. Dietary changes can also significantly reduce how much wind you experience.
Should I stop taking Mounjaro if I have wind and burping?
No — wind and burping alone are not a reason to stop Mounjaro. These are expected, temporary side effects that usually improve within weeks. Speak to your prescriber if symptoms are very uncomfortable. They can suggest management strategies or, in rare cases, discuss your options if side effects significantly affect your quality of life.
Does Mounjaro wind and burping mean it's working?
Not directly. Wind and burping are a side effect of how Mounjaro works (delayed gastric emptying), but they don't indicate how effective it is for weight loss. Some people experience minimal digestive symptoms yet still achieve good weight loss, whilst others have more noticeable wind. Your prescriber can assess effectiveness using our free GLP-1 weight loss calculator to project your results at your current dose, alongside your actual progress tracked with our progress tracker tool.
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.