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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Which fruits are good for weight loss?
Certain fruits can support weight loss as part of a healthy diet, but for many UK adults, combining dietary changes with prescription weight management medication delivers stronger results. Berries, apples, and citrus fruits are lower in calories and high in fibre, helping you feel fuller longer. However, if you have a BMI of 30 or above—or 27 or above with weight-related health conditions—you may be eligible for GLP-1 weight loss medication through the NHS or private prescribing. This guide explains which fruits help with weight management and how prescription options work in the UK.
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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.
Prescription weight loss medication available in the UK
For eligible UK adults, prescription weight loss injections offer evidence-based support alongside dietary changes. Three main options are licensed in the UK:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist; clinical trials showed an average weight loss of 15–21% of body weight at maximum dose
- Wegovy (semaglutide) — a GLP-1 receptor agonist; evidence suggests approximately 15% average weight loss in clinical trials
- Saxenda (liraglutide) — a GLP-1 receptor agonist delivered as a daily injection; similar efficacy to Wegovy
All three are prescription-only medicines and require a clinical assessment to determine eligibility. Our free GLP-1 weight loss calculator can help you estimate potential weight loss at different doses, giving you a sense of what might be achievable with medication support. These medications work best when combined with reduced-calorie diet and increased physical activity—fruits like berries and apples fit naturally into this approach.
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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.
NHS vs private access: how to get prescription weight loss treatment
In the UK, you can access prescription weight loss medication through two routes:
- NHS route: Referral to a tier 3 specialist weight management service through your GP; availability and waiting times vary significantly by region (ICB)
- Private route: Online consultation with a UK-licensed prescriber; assessment and prescription issued if clinically suitable; dispensed by a GPhC-registered pharmacy
To find out if you're eligible, speak to your GP or use our free BMI calculator to check your personal BMI. Adults with a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea, may qualify. Your prescriber will assess your individual health before recommending treatment. Prescription medication is most effective alongside lifestyle changes—including a balanced diet with whole fruits—and regular physical activity.
- 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.
Can eating fruit alone help me lose weight?
Whole fruits are nutrient-dense and can support weight loss when part of a calorie-controlled diet. Berries, apples, and citrus are particularly beneficial due to high fibre content and lower calorie density. However, for significant or sustained weight loss, many UK adults benefit from combining diet changes with prescription medication if eligible.
Which fruits are best for weight loss?
Low-calorie, high-fibre fruits are most helpful: berries (blueberries, raspberries, strawberries), apples, oranges, grapefruits, and pears. These promote satiety and provide vitamins and minerals. Avoid high-sugar fruits in large quantities like dried fruits, tropical fruits, and fruit juices.
Am I eligible for prescription weight loss medication in the UK?
If you have a BMI of 30 or above, or 27 or above with weight-related health conditions (diabetes, high blood pressure, sleep apnoea), you may be eligible. Use our free BMI calculator to check your BMI, then speak to your GP to discuss NHS specialist services or private prescribing options.
How much weight can I expect to lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% of body weight with Mounjaro and approximately 15% with Wegovy—though individual results vary significantly. Weight loss depends on dose, adherence, and lifestyle changes including diet and physical activity. Use our GLP-1 weight loss calculator for a personalised estimate.
Can I combine fruit-based dieting with prescription weight loss injections?
Yes—prescription medication works best alongside a reduced-calorie diet and increased physical activity. Whole fruits fit naturally into a healthy eating plan. Your prescriber or dietitian will provide guidance on dietary changes to complement your medication. Track your progress with our free progress tracker tool.
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.