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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5 Fruits to Avoid for Weight Loss
Certain fruits are higher in natural sugars and calories, making them less ideal during weight loss efforts. While fruit is nutritious, understanding which varieties to moderate can support your weight management strategy. In the UK, many people combine dietary approaches with prescription weight loss medication — options like Mounjaro and Wegovy are available for eligible adults. This guide explains which fruits to be mindful of and how prescription weight management in the UK works alongside healthy eating habits.
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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.
High-Sugar Fruits to Limit During Weight Loss
When losing weight, portion control and sugar intake matter. Some fruits are naturally higher in calories and simple sugars, which can affect blood sugar levels and slow progress. The five fruits to be mindful of include:
- Dried fruits (raisins, dried mango, dates) — concentrated sugars and calories; a small handful can equal one fresh fruit's sugar content
- Grapes — high sugar density; easy to overconsume, often containing 17g sugar per 150g serving
- Mango — tropical fruit with approximately 46g carbohydrates and 41g sugar per whole fruit
- Banana — moderate-to-high carbohydrate content (27g per medium banana); useful for energy but can limit progress if portion-controlled
- Fruit juice and smoothies — concentrated sugars without fibre; lack satiety compared to whole fruit
Lower-sugar alternatives include berries (blueberries, strawberries), watermelon, and grapefruit. Pairing any fruit with protein or fat slows sugar absorption. For personalised dietary guidance during weight loss, your GP can refer you to a dietitian, or you can use our free BMI calculator and GLP-1 weight loss calculator to explore your current health metrics and potential weight management pathways.
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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.
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Prescription Weight Management Options Available in the UK
For eligible adults seeking weight management support in the UK, prescription medications are available through NHS specialist services or private prescribing. Mounjaro (tirzepatide) and Wegovy (semaglutide) are the most commonly accessed GLP-1 and dual-action weight loss injections. Both work alongside dietary changes, not instead of them. Adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, may be eligible. Clinical trials show Mounjaro helped participants lose an average of 15–21% body weight, while Wegovy achieved approximately 15% average reduction — though individual results vary. Prescription weight loss medication NHS guidance emphasises combining treatment with lifestyle modifications including balanced nutrition and physical activity for sustainable outcomes.
- 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 have the most sugar content?
Dried fruits, grapes, mangoes, and bananas rank highest in natural sugars. A single mango contains approximately 41g of sugar, while a cup of grapes contains around 23g. Dried fruit is particularly concentrated — three dried dates contain as much sugar as a whole fresh orange. Fresh berries like strawberries and raspberries are lower-sugar alternatives, typically containing 7–12g sugar per cup.
Can I eat fruit while losing weight?
Yes, absolutely. Whole fruits are nutritious and contain fibre, which supports digestion and satiety. During weight loss, focus on lower-sugar varieties like berries, apples with skin, and citrus fruits. Pair fruit with protein or healthy fat (e.g. almonds with an apple) to slow sugar absorption and improve fullness. Portion control matters more than avoidance.
How does prescription weight loss medication help with dietary changes?
GLP-1 medications like Mounjaro and Wegovy reduce appetite and food cravings, making it easier to maintain a reduced-calorie diet naturally. They don't replace healthy eating — instead, they support the dietary discipline needed for sustainable weight loss. Many people find they naturally gravitate toward smaller portions and healthier food choices when using these medications, alongside their own dietary efforts.
Am I eligible for prescription weight loss treatment in the UK?
Adults with a BMI of 30 kg/m² or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, heart disease), may be eligible. To find out, speak to your GP about referral to NHS weight management services, or contact a private prescriber for a clinical assessment. Use our free BMI calculator to check your current BMI and start the conversation with your healthcare provider.
What's the difference between NHS and private weight loss medication access in the UK?
NHS access requires GP referral to tier 3 specialist weight management services; availability varies by region and waiting times can be lengthy. Private access is through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber — faster but involves private cost. Both routes provide prescription-only medications and require appropriate clinical oversight.
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.