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
Best Smoothie For Weight Loss
A well-designed smoothie can support weight loss when it fits into a calorie deficit — the foundation of sustainable weight management in the UK. Rather than a structured approach, smoothies work best alongside balanced nutrition, increased physical activity, and where appropriate, prescription weight loss medication. This guide explains how to build smoothies that genuinely support your weight management journey, using evidence-based principles and affordable UK ingredients. Whether you're exploring smoothies as part of NHS weight loss guidance or considering prescription options like GLP-1 medication, understanding nutrition fundamentals helps you make informed choices.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 to Build a Weight Loss Smoothie
A weight loss smoothie should prioritise three key elements: protein, fibre, and controlled calories. Protein helps you feel fuller for longer and preserves muscle during weight loss. Aim for 15–25g per serving using Greek yoghurt, protein powder, or milk-based options. Fibre from vegetables, oats, and seeds slows digestion and prevents blood sugar spikes. Aim for 5–10g per smoothie.
- Protein sources: Greek yoghurt (0% fat versions have 10g protein per 100g), whey protein powder, plant-based protein, cottage cheese, milk
- Fibre sources: Frozen berries, spinach, ground flaxseed, chia seeds, oats, avocado (use sparingly — high calorie)
- Liquid base: Unsweetened almond milk (30 kcal/100ml), water, or black coffee for a savoury smoothie
- Calorie target: 200–300 kcal per smoothie fits most calorie deficit diets
Avoid adding honey, agave, or fruit juices — these spike blood sugar and add empty calories. Whole fruit is fine; just limit to one portion per smoothie.
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.
Weight Loss Smoothie Recipes & Nutrition Context
High-protein berry smoothie (220 kcal): 150g Greek yoghurt, 80g frozen mixed berries, 30g oats, 200ml unsweetened almond milk, 1 tbsp ground flaxseed. Protein: 20g, Fibre: 6g.
Green spinach smoothie (185 kcal): 100g spinach, 150ml unsweetened almond milk, 30g whey protein powder, ½ frozen banana, 1 tbsp almond butter. Protein: 25g, Fibre: 4g.
Smoothies are most effective when part of a structured approach to weight loss. The NHS recommends a calorie deficit of around 500 kcal/day for sustainable loss of 0.5–1 kg weekly. Use our free BMI calculator to establish your baseline, then our GLP-1 weight loss calculator to explore how prescription options might complement dietary changes if appropriate. Track your progress with our free progress tracker to see what works for your body.
- 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 smoothies alone help me lose weight?
Smoothies alone won't cause weight loss — only a consistent calorie deficit does. A well-designed smoothie can support weight loss by keeping you fuller for longer and replacing high-calorie snacks, but it must fit into an overall reduced-calorie diet. NHS guidance emphasises that sustainable weight loss requires both dietary changes and increased activity.
How many calories should my weight loss smoothie contain?
Aim for 200–300 kcal per smoothie, depending on your total daily calorie target. A typical calorie deficit for weight loss is around 500 kcal/day, which translates to losing approximately 0.5 kg per week. A sensible breakfast smoothie should be no more than 25–30% of your daily calorie allowance.
What's the best protein powder for weight loss smoothies in the UK?
Whey protein isolate is effective and affordable in the UK — typically 25g protein per serving with minimal carbs. Plant-based options like pea or hemp protein work equally well if you prefer vegan options. Choose unsweetened versions and check labels: aim for at least 20g protein and less than 5g sugar per serving.
Should I include fruit in a weight loss smoothie?
Yes, but in moderation. One portion of whole fruit (80g berries or ½ banana) adds fibre, nutrients, and volume without excessive calories. Avoid fruit juices and smoothie bowls with granola and coconut — these add calories rapidly. Frozen berries are ideal: low calorie, high fibre, and accessible year-round across UK supermarkets.
Are smoothies suitable if I'm taking weight loss medication like Wegovy or Mounjaro?
Smoothies can work well alongside prescription weight loss medication, as they're easy to consume and can be tailored to your changing appetite. However, some people experience nausea or reduced appetite on GLP-1 medications like semaglutide (Wegovy) or tirzepatide (Mounjaro). Discuss any dietary changes with your prescriber, as medication may affect how much nutrition you need. Smoothies should complement, not replace, whole foods.
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.