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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Does Inulin Help with Weight Loss?
Inulin is a type of dietary fibre found in plants like chicory and garlic that some people believe can support weight loss. While inulin may have some benefits for digestive health and blood sugar control, the evidence for direct weight loss is limited and modest. This guide explains what inulin is, how it might support weight management, and how it compares to evidence-based weight loss approaches used across the UK NHS. Understanding the science behind inulin can help you make informed decisions about your weight management strategy.
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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 Does Inulin Work for Weight Loss?
Inulin is a soluble fibre that passes largely undigested into the colon, where it's fermented by gut bacteria. This process may have several effects on weight management:
- Increased satiety: As a soluble fibre, inulin may help you feel fuller for longer, potentially reducing overall calorie intake.
- Blood sugar regulation: Inulin may help stabilise blood sugar levels, which could reduce cravings and energy crashes that lead to overeating.
- Gut health: Fermentation of inulin produces short-chain fatty acids that support beneficial gut bacteria, linked to better metabolic health.
- Modest calorie reduction: Some studies suggest inulin supplementation may reduce hunger signals and support a small calorie deficit.
However, the evidence for significant weight loss from inulin alone is limited. Most studies show modest effects — typically less than 1 kg over several months. Inulin works best as part of a broader weight management strategy, alongside a reduced-calorie diet and physical activity.
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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.
Inulin vs Evidence-Based Weight Loss in the UK
For sustainable weight loss across the UK, the NHS recommends a calorie deficit of approximately 500 kcal per day, which typically results in losing 0.5 to 1 kg per week. Prescription weight loss medications, including GLP-1 injections like Mounjaro and Wegovy, have much stronger clinical evidence for weight management. In the STEP trials, Wegovy helped people lose an average of around 15% of their body weight — far more substantial than inulin alone. Our free GLP-1 weight loss calculator can help you estimate potential outcomes with prescription medication. For most people, sustainable weight loss involves dietary changes, increased physical activity, and — where clinically appropriate — prescription support. Check your BMI using our free calculator to see whether you might benefit from additional weight management strategies.
- 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.
What is inulin and where does it come from?
Inulin is a naturally occurring soluble fibre found in plants including chicory root, garlic, onions, asparagus, and bananas. It's often extracted from chicory and sold as a dietary supplement or food additive. In the UK, it's commonly added to breakfast cereals, yoghurts, and protein bars to increase fibre content.
Can inulin alone help me lose weight?
Inulin alone is unlikely to produce significant weight loss. Clinical trials show modest effects — typically less than 1 kg over several months. It works best as part of a comprehensive weight management approach that includes a reduced-calorie diet and physical activity. For stronger evidence-based support, speak to your GP about prescription weight loss options.
How much inulin should I take for weight loss?
There's no established optimal dose for weight loss. Studies typically used 10–30 grams per day, but effects were modest. Always start with a small amount (5 grams) as inulin can cause bloating, gas, and digestive discomfort if introduced too quickly. Increase gradually over weeks. Consult your GP before taking inulin supplements, especially if you have digestive conditions.
Is inulin safe to take every day?
Inulin is generally safe for most people when taken in moderate amounts (up to 15 grams daily). However, it can cause bloating, gas, and diarrhoea, especially when starting. People with IBS or sensitive digestion may tolerate it poorly. If you have a history of digestive issues, consult your GP before supplementing. Inulin also contains small amounts of fructose — relevant for those with fructose intolerance.
How does inulin compare to weight loss injections like Mounjaro and Wegovy?
Inulin is a dietary fibre with modest, limited evidence for weight loss. Mounjaro and Wegovy are prescription-only GLP-1 injections with strong clinical evidence — participants in trials lost an average of 15–21% of body weight. They work through completely different mechanisms (activating hunger-regulating hormones rather than just adding fibre). Prescription weight loss medications require clinical assessment and a GP or prescriber prescription. Inulin may complement other strategies but isn't a substitute for evidence-based medical treatment.
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.