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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Fruit Smoothies for Weight Loss in the UK
Fruit smoothies can be a nutritious part of a weight management plan when made with the right ingredients and portion sizes. However, many shop-bought and homemade smoothies are surprisingly high in sugar and calories, which can work against weight loss goals. This guide covers how to make smoothies that genuinely support your weight loss journey, plus information about prescription weight management options available to UK adults. The NHS recommends combining dietary changes with increased physical activity for sustainable results — and knowing whether prescription support might be right for you is an important part of planning your approach.
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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.
Making Weight-Loss-Friendly Fruit Smoothies
Fruit smoothies can support weight loss, but the ingredients matter enormously. A high-sugar smoothie can contain 300–400 kcal and 40g+ of sugar — equivalent to a dessert. To make smoothies genuinely helpful for weight management in the UK:
- Use protein — add Greek yoghurt, protein powder, or silken tofu to increase satiety and muscle preservation during weight loss
- Include fibre — berries (especially blackcurrants and raspberries) contain more fibre than tropical fruits like mango or pineapple, which helps you feel fuller longer
- Limit added sugars — avoid fruit juice, honey, or syrups; use whole fruit instead. One medium banana plus a handful of berries is plenty
- Control portions — aim for 200–250 kcal smoothies, not 500+ kcal meal replacements
- Add healthy fats — a small amount of almond butter or seeds slows digestion and improves satisfaction
A sustainable smoothie recipe for weight loss might include: 150ml unsweetened almond milk, 100g Greek yoghurt, half a banana, 80g mixed berries, 1 tablespoon almond butter, and a handful of spinach (under 250 kcal, ~12g protein). Track your progress using our free progress tracker to see how smoothies fit into your overall calorie intake.
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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 Management Options in the UK
Whilst dietary changes like optimising smoothies are important, prescription weight management medication is available in the UK for eligible adults. Three main GLP-1 weight loss injections are licensed here: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These work by reducing appetite and supporting satiety — meaning smaller portions and fewer cravings. In clinical trials, Mounjaro helped participants lose an average of 15–21% of body weight, and Wegovy around 15%, alongside diet and exercise. Eligibility typically requires a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure. You can use our free BMI calculator above to check your personal BMI instantly. Access is available through NHS specialist weight management services (often with waiting lists) or private prescribing following an online clinical assessment.
If you're considering fruit smoothies as part of your weight loss strategy, it's worth having a conversation with your GP about whether prescription support might also help. Your GP can assess whether you're eligible for weight loss medication based on your BMI and health circumstances. Our GLP-1 weight loss calculator can help you estimate potential outcomes if medication is prescribed, giving you a clearer picture of what prescription support might achieve alongside your lifestyle changes. The NHS recommends a combined approach — dietary changes like making healthier smoothies, increased physical activity, behaviour change, and (where appropriate) prescription medication all work together for the best results.
- 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.
Are fruit smoothies good for weight loss?
Fruit smoothies can support weight loss if made carefully — but many are too high in sugar and calories. Use whole fruit rather than juice, add protein (Greek yoghurt, protein powder), include fibre-rich berries, and keep portions around 200–250 kcal. A smoothie should aid satiety, not replace it with liquid calories.
How many calories should a weight-loss smoothie have?
Aim for 200–250 kcal per smoothie if it's replacing a snack, or up to 300 kcal if it's a light meal. This depends on your overall calorie deficit — the NHS recommends a 500 kcal daily deficit for sustainable loss of around 0.5 kg per week. Use our weight converter and BMI calculator to understand your personal targets.
What prescription weight loss options are available in the UK?
Three GLP-1 medications are licensed for weight management: Mounjaro (tirzepatide, once-weekly), Wegovy (semaglutide, once-weekly), and Saxenda (liraglutide, daily). All are prescription-only and require clinical assessment. Eligibility typically requires BMI 30+ or BMI 27+ with weight-related health conditions.
Can I combine smoothies with prescription weight loss medication?
Yes. Prescription medications like Mounjaro or Wegovy work best alongside lifestyle changes including a balanced diet and increased physical activity. Healthier smoothies can be part of this approach. Your prescriber will discuss how to combine dietary changes with medication for optimal results.
How do I find out if I'm eligible for weight loss medication in the UK?
Check your BMI using our free BMI calculator on this page — eligibility typically starts at BMI 30, or 27 with weight-related conditions. Book an appointment with your GP to discuss weight management options, including whether prescription support is appropriate for you.
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.