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
What Does "Wind On Mounjaro" Mean?
"Wind on Mounjaro" refers to bloating, gas, and abdominal discomfort that some people experience when taking tirzepatide for weight management. This is a recognised side effect caused by how Mounjaro works — it slows stomach emptying and changes how your digestive system processes food. While uncomfortable, it's usually temporary and manageable with simple lifestyle adjustments. Understanding what to expect can help you stay on track with your treatment.
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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 Bloating and Gas
Mounjaro (tirzepatide) is a GIP and GLP-1 receptor agonist — it activates two natural hormone pathways that help regulate appetite and blood sugar. One key effect is slowing gastric emptying, meaning food moves through your stomach more slowly. This reduced digestion speed can trap gas and cause bloating, especially in the first few weeks of treatment or after dose increases.
- Gas builds up when food sits longer in your stomach and intestines
- Eating too quickly or consuming gas-producing foods worsens the effect
- This side effect typically improves within 4–8 weeks as your body adjusts
- High-fat or high-fibre meals eaten too fast increase discomfort
The good news: bloating and wind are not signs that Mounjaro isn't working — they're a common adjustment response.
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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 Bloating On Mounjaro
Practical tips to reduce gas and bloating:
- Eat slowly and chew thoroughly — aim for 20–30 minutes per meal
- Eat smaller, more frequent meals instead of three large ones
- Avoid carbonated drinks, beans, and cruciferous vegetables temporarily
- Stay hydrated with still water, not fizzy drinks
- Gentle walking after meals can help food move through your system
- Over-the-counter products like simethicone or peppermint tea may provide relief
If bloating persists beyond 8 weeks or worsens significantly, contact your GP or the prescriber who issued your Mounjaro prescription — dose adjustment or additional management strategies may help.
- 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.
Is wind and bloating a normal side effect of Mounjaro?
Yes, bloating and gas are very common side effects in the first 4–8 weeks of Mounjaro treatment. They occur because tirzepatide slows stomach emptying, allowing gas to build up. This is not a sign of an allergic reaction or serious problem — it's an adjustment response that usually improves over time.
How long does bloating last on Mounjaro?
Most people experience significant improvement within 4–8 weeks as their digestive system adjusts to the medication. However, individual timelines vary. If bloating persists beyond 8 weeks, discuss it with your GP or prescriber — they may suggest dietary adjustments or evaluate whether dose changes could help.
Can I reduce wind on Mounjaro by changing what I eat?
Yes. Eating slowly, choosing lower-fibre foods temporarily, avoiding carbonated drinks, and eating smaller meals can all reduce bloating. High-fat and high-fibre foods are common culprits. Keeping a food diary can help you identify which foods trigger the most discomfort for your body.
Should I stop taking Mounjaro if I have bad bloating?
No — speak to your GP or prescriber first. Bloating is usually temporary and manageable with dietary changes. Stopping treatment without medical guidance could affect your weight management and overall health. Your prescriber may suggest dose timing adjustments or other strategies to improve comfort.
Is bloating on Mounjaro the same as bloating on Wegovy?
Both Mounjaro and Wegovy slow stomach emptying, so bloating can occur with both. However, Mounjaro is a dual GIP and GLP-1 agonist while Wegovy is GLP-1 only, so individual experiences vary. Your prescriber can discuss which medication may suit your digestive tolerance better.
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.