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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Is Pineapple Good for Weight Loss?
Pineapple is often promoted as a weight loss superfood, but the reality is more nuanced. While pineapple contains bromelain (an enzyme) and is relatively low in calories, it's not a clinically supported solution for weight management. The truth is, sustainable weight loss in the UK depends on consistent calorie deficit, physical activity, and lifestyle changes. If you're exploring weight management options, prescription weight loss medication such as Mounjaro or Wegovy may be worth discussing with your GP—especially if you have a BMI of 30 or above, or 27 or above with weight-related health conditions.
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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.
Does Pineapple Actually Help You Lose Weight?
Pineapple is low in calories (around 50 calories per 100g) and high in fibre, which may help you feel fuller for longer. It also contains bromelain, an enzyme that some claim aids digestion and fat breakdown. However, scientific evidence supporting bromelain specifically for weight loss is limited. The enzyme is largely destroyed during digestion, and pineapple alone won't create the calorie deficit needed for meaningful weight loss.
- Pineapple's natural sugars are still calories—eating excessive amounts can hinder weight loss
- One medium pineapple contains roughly 450 calories
- Fibre content (about 1.4g per 100g) supports digestive health but isn't unique to pineapple
- The bromelain effect on fat metabolism lacks strong clinical evidence
For genuine weight management in the UK, combining dietary changes (like adding more vegetables and lean proteins) with regular physical activity is more effective than relying on any single food. If you're struggling with sustained weight loss, prescription options like GLP-1 weight loss injections are available through NHS specialist services or private prescribing.
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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.
Prescription Weight Loss Options Available in the UK
If you're interested in nhs weight loss support or prescription medication, the UK offers several licensed options. Mounjaro (tirzepatide) and Wegovy (semaglutide) are once-weekly injections approved for adults with a BMI of 30 or above, or 27 or above with health conditions like type 2 diabetes or high blood pressure.
- Mounjaro: dual GIP and GLP-1 agonist; average weight loss ~15–21% body weight in trials
- Wegovy: GLP-1 agonist; average weight loss ~15% body weight in trials
- Both are prescription-only and require clinical assessment
- Available through NHS tier 3 specialist services (variable waiting times) or private online prescribing
Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses. Your GP can assess eligibility and discuss whether prescription medication is right for you alongside diet and exercise changes.
- 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 pineapple good for weight loss on its own?
No. While pineapple is low in calories and contains fibre, it's not a weight loss solution by itself. Weight loss requires a consistent calorie deficit, physical activity, and lifestyle changes. Eating pineapple as part of a balanced diet may help, but the fruit alone won't create meaningful weight loss.
Does bromelain in pineapple burn fat?
Bromelain is an enzyme that aids protein digestion, but evidence that it specifically burns fat or boosts metabolism is weak. Most bromelain is destroyed during stomach digestion, so the amount reaching your gut is minimal. It's not a fat-burning compound.
How many calories are in pineapple?
One medium pineapple (about 900g) contains roughly 450 calories. Per 100g, pineapple has around 50 calories. While relatively low-calorie, pineapple's natural sugars still count toward your daily calorie intake and should be factored into a weight loss plan.
What's a better approach to weight loss than relying on pineapple?
Sustainable weight loss involves a calorie deficit of about 500 kcal per day (resulting in roughly 0.5kg per week loss), regular physical activity, and consistent habits. For eligible adults in the UK, prescription weight loss medication like Mounjaro or Wegovy may also support efforts alongside lifestyle changes.
How do I know if I'm eligible for prescription weight loss medication in the UK?
You may be eligible if you have a BMI of 30 or above, or BMI of 27–29 with a weight-related health condition (type 2 diabetes, high blood pressure, sleep apnoea, etc.). Speak to your GP about referral to NHS specialist services, or explore private prescribing options. Use our free BMI calculator to check your current BMI and discuss options with your healthcare provider.
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.