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
Fruits That Are Good for Weight Loss
Certain fruits can support your weight loss journey, particularly those high in fibre and low in calories. However, if you're looking for structured weight management in the UK, prescription options like Mounjaro and Wegovy are available for eligible adults. This guide covers both dietary approaches and the evidence-based medication options your GP can discuss with you.
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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.
Best Fruits for Weight Loss and Healthy Eating
When it comes to weight loss, some fruits stand out for their nutritional profile. Berries — including blueberries, raspberries, and strawberries — are excellent choices: they're high in fibre, low in calories (around 50–80 kcal per 100g), and contain polyphenols that support metabolic health. Apples (approximately 52 kcal per 100g) and pears provide soluble fibre that helps you feel fuller for longer, which can reduce overall calorie intake. Grapefruit has been studied for weight management benefits and pairs well with a reduced-calorie diet. Citrus fruits like oranges and lemons are nutrient-dense with minimal calories. The key is portion control — fruit still contains natural sugars, so aim for 2–3 portions daily as part of a balanced approach. When combined with increased physical activity and a calorie deficit of approximately 500 kcal per day, sustainable weight loss of around 0.5 kg per week is achievable. For more structured weight management, the NHS recommends consulting your GP about eligibility for prescription weight loss medication.
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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 dietary changes alone haven't worked, prescription weight loss medications are available through the NHS or private prescribing. Mounjaro (tirzepatide) and Wegovy (semaglutide) are GLP-1-based injections that work alongside diet and exercise — clinical trials showed average weight loss of 15–21% with Mounjaro and around 15% with Wegovy. You may be eligible if your BMI is 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. NHS access is through specialist tier 3 weight management services (referral from your GP), though private online prescribing is also available. Our free GLP-1 weight loss calculator can help you understand potential outcomes at different doses. Your GP is the best starting point to discuss whether prescription medication suits your circumstances.
- 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.
Which fruits are lowest in calories for weight loss?
Berries (raspberries, strawberries, blueberries) are among the lowest, at 30–80 kcal per 100g. Grapefruit, watermelon, and citrus fruits are also very low-calorie options. Pair them with protein and fibre to increase satiety and support a calorie deficit.
Can I eat unlimited fruit and still lose weight?
No — fruit contains natural sugars and calories. While nutritious, exceeding 2–3 portions daily can increase overall calorie intake. The NHS recommends balancing fruit intake with other food groups within a calorie deficit of approximately 500 kcal per day for sustainable loss.
What's the difference between diet alone and prescription weight loss medication?
Diet and exercise are foundational, but results plateau for many people. Prescription medications like Mounjaro and Wegovy work by reducing appetite and supporting fuller feeling. They're prescribed alongside lifestyle changes, not instead of them, and are only available to eligible adults.
How do I know if I'm eligible for prescription weight loss treatment in the UK?
You may be eligible if your BMI is 30 kg/m² or above, or 27–29.9 with weight-related health conditions. Start by discussing your situation with your GP, who can refer you to NHS specialist services or discuss private options available through licensed prescribers.
What's the safest rate of weight loss I should aim for?
The NHS recommends losing 0.5–1 kg (1–2 lbs) per week for sustainable results. A calorie deficit of roughly 500 kcal per day typically achieves this. Whether managing weight through diet, exercise, or prescription medication, this gradual approach helps preserve muscle and supports long-term success.
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.