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
Is Pineapple Healthy For Weight Loss?
Pineapple can be part of a healthy weight loss diet, but it's not a weight loss solution on its own. This tropical fruit is low in calories (around 50 calories per 100g), high in fibre, and contains bromelain — an enzyme that may aid digestion. However, sustainable weight loss requires a calorie deficit, regular physical activity, and consistent lifestyle changes. For adults in the UK struggling with weight management, prescription options like GLP-1 weight loss injections may be worth discussing with your GP alongside dietary improvements.
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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.
UK Prescription Weight Loss Options
If you're exploring weight management in the UK and your BMI is 30 or above (or 27 or above with weight-related health conditions), your GP may refer you to specialist services that offer prescription weight loss medications. Three prescription weight loss options are currently available:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist, once-weekly injection. Clinical trials showed average weight loss of 15–21% body weight.
- Wegovy (semaglutide) — a GLP-1 weight loss injection, once-weekly. Average weight loss in trials was approximately 15% body weight.
- Saxenda (liraglutide) — a once-daily GLP-1 injection, approved for weight loss medication in the UK.
These work alongside dietary changes — pineapple and other whole foods remain part of a healthy approach. Use our free GLP-1 weight loss calculator to explore potential outcomes with prescription medication.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
NHS vs Private Weight Loss Support
NHS access to weight loss medication is through specialist tier 3 services, typically following a GP referral. Waiting times vary by region and availability can be limited. Private access is available through UK-licensed online prescribers, without requiring NHS referral — though you'll need to meet clinical eligibility criteria and costs apply.
Your first step: speak to your GP about NBS weight loss options available to you locally. They can assess whether prescription treatment is appropriate alongside your own lifestyle changes. Whether you choose dietary approaches like including nutrient-rich foods or explore medication options, individual results vary and sustainable change requires commitment to multiple factors — not diet alone.
- 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.
Does pineapple burn belly fat?
No, pineapple does not burn fat on its own. Its enzyme bromelain may aid protein digestion, but weight loss only happens through a calorie deficit. Pineapple is low in calories and fibre-rich, making it a good choice in a reduced-calorie diet, but it's not a fat-burning food.
What's the role of diet in weight loss if I'm considering prescription medication?
Diet is fundamental regardless of medication. Prescription weight loss injections work best alongside a reduced-calorie diet and increased physical activity. They're not replacements for lifestyle change — they're tools that support it by reducing appetite and food cravings. Your GP can explain how medication and diet work together.
Am I eligible for prescription weight loss treatment on the NHS?
You may be eligible if your BMI is 30 or above, or 27–29.9 with a weight-related health condition (diabetes, high blood pressure, heart disease, etc.). Eligibility is assessed by your GP or specialist weight management service. For South Asian, Black African, and Caribbean heritage adults, lower BMI thresholds apply.
How quickly can I lose weight with prescription weight loss medication?
Clinical trials show average weight loss of 15–21% body weight over several months, but individual results vary significantly. Most people lose 0.5–1 kg per week safely. Your GP will monitor your progress and adjust treatment as needed. Use our BMI calculator to track your baseline and set realistic goals.
Can I use diet alone instead of considering medication?
Yes, many people lose weight through diet and exercise alone. The NHS recommends a calorie deficit of around 500 kcal daily for gradual, sustainable loss. However, if you've struggled with diet alone or have comorbidities, your GP may suggest prescription support. The best approach depends on your individual circumstances.
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.