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
Are Fruit Smoothies Good For Weight Loss?
Fruit smoothies can support weight loss, but only if they're part of a structured approach to weight management in the UK. While smoothies provide vitamins and fibre, many are high in natural sugars and calories — often 250–400 kcal per serving. For sustainable weight loss, you need a calorie deficit of around 500 kcal per day. Smoothies work best when portion-controlled, made with whole fruit rather than juice, and combined with physical activity. They're not a weight loss solution alone, but can be part of an NHS-aligned healthy eating plan.
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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.
How Smoothies Affect Your Weight Loss Goals
The key to weight loss success is understanding your total calorie intake. A typical fruit smoothie contains 150–400 kcal depending on ingredients. A banana and berry smoothie made with yoghurt and honey can easily exceed 300 kcal, which is a significant portion of a reduced-calorie diet. Smoothies made entirely from juice (rather than whole fruit) lose fibre and concentrate natural sugars, which can spike blood sugar and leave you feeling hungry sooner.
- High sugar content — Even "natural" fruit sugars can slow weight loss if calories aren't managed overall
- Liquid calories absorbed quickly — Drinking calories doesn't trigger the same satiety signals as eating whole fruit
- Portion control matters — A small smoothie (200–250 kcal) can fit into weight loss, a large one rarely does
- Fibre is protective — Whole fruit smoothies with seeds retain more fibre than blended juice
For weight management in the UK, use our free BMI calculator to establish your healthy weight range, then plan your daily calories accordingly. If you're considering prescription weight loss options, our GLP-1 weight loss calculator can help you understand potential outcomes alongside lifestyle changes.
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.
Making Smoothies Work for Weight Loss
To make smoothies weight-loss-friendly, prioritise whole fruit over juice, add protein, and keep portions under 250 kcal. Use Greek yoghurt or protein powder instead of regular yoghurt, include a handful of berries (low sugar), and avoid honey, syrups, or added sugars. A smart smoothie might contain: frozen berries (80 kcal), Greek yoghurt (100 kcal), spinach (10 kcal), and water or unsweetened almond milk (5 kcal) = 195 kcal total with good protein and fibre.
Smoothies are best a UK pharmacy as a meal replacement or snack within your daily calorie allowance, not an addition to it. For NHS-aligned weight management guidance, your GP can advise on the right approach for your circumstances. If you're tracking weight loss progress, try our free progress tracker to log your journey.
- 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 I lose weight drinking smoothies every day?
Yes, but only if the smoothie fits within your daily calorie deficit and replaces other foods rather than adding extra calories. A 200 kcal smoothie daily is fine; a 400 kcal smoothie on top of normal meals will not support weight loss. The NHS recommends a 500 kcal deficit per day for sustainable 0.5 kg weekly loss.
Are fruit smoothies better than whole fruit for weight loss?
No. Whole fruit is better because chewing triggers satiety signals and the fibre stays intact. Blended smoothies are absorbed quickly and don't satisfy hunger as well. If you choose smoothies, make them thick with whole fruit, not thin with juice.
What's the best fruit to use in a weight loss smoothie?
Berries are best — they're lower in natural sugars than bananas, mangoes, or grapes. A 100g serving of raspberries is only 32 kcal; a medium banana is 105 kcal. Mix berries with Greek yoghurt and spinach for a balanced, low-calorie option.
Can smoothies help with weight loss if I'm also taking Mounjaro or Wegovy?
Yes, smoothies can be part of weight management alongside GLP-1 medications. However, smoothies may trigger nausea or indigestion in some people using these injections. Stick to smaller portions (150–200 kcal), avoid very sweet recipes, and listen to your body's signals.
How do smoothies compare to other weight loss strategies?
Smoothies alone are not a weight loss strategy — they're a tool within a broader plan. For sustainable UK weight loss, combine portion-controlled eating, physical activity, and consistent calorie tracking. If you need additional support, your GP can discuss prescription weight loss options or refer you to NHS specialist services.
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.