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 Protein Smoothies Good For Weight Loss?
Protein smoothies can be a useful part of a weight loss plan, but they're most effective when combined with a calorie deficit and regular physical activity. Whilst protein helps keep you feeling fuller for longer, smoothies alone won't create the weight loss that many people hope for. If you're struggling to lose weight through diet and exercise alone, prescription weight management options are now available to eligible adults in the UK—both through the NHS and privately. Our GLP-1 weight loss calculator can help you explore what medication-supported weight loss might look like for you.
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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 Protein Smoothies Support Weight Loss
Protein is one of the most satiating macronutrients, meaning it helps you feel fuller for longer after eating. This can reduce overall calorie intake throughout the day, which is the foundation of weight loss. A smoothie with adequate protein—typically 20–30g per serving—can work well as a meal replacement or snack, particularly if it includes whole food ingredients like Greek yoghurt, protein powder, or nuts.
- Protein smoothies can reduce hunger between meals and support appetite control
- They're quick to prepare, making healthy eating more convenient
- Adding fibre from fruits, vegetables, or oats increases satiety further
- Homemade smoothies allow you to control sugar and calorie content—shop-bought versions often contain hidden sugars
However, smoothies are not a clinically supported solution. Weight loss still requires a sustained calorie deficit. If you're consuming a 300 kcal protein smoothie but still eating above your daily calorie needs elsewhere, you won't lose weight. The NHS recommends losing 0.5–1 kg per week for sustainable results, which typically requires a deficit of around 500 kcal per day through diet and exercise combined.
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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.
UK Prescription Weight Loss Options for Eligible Adults
If diet and lifestyle changes—including protein-rich foods and smoothies—haven't achieved your weight loss goals, prescription weight management medications are available to eligible adults in the UK. Three GLP-1 medications are currently licensed for weight management: Mounjaro (tirzepatide, once-weekly injection), Wegovy (semaglutide, once-weekly injection), and Saxenda (liraglutide, once-daily injection). Clinical trials have shown these can help adults lose an average of 14–21% of their body weight when used alongside lifestyle changes. Eligibility typically requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes or high blood pressure.
Access routes: NHS specialist weight management services offer prescription weight loss, though availability and waiting lists vary significantly by region. Private online prescribing services provide faster access following a clinical assessment. Your GP can discuss which route and medication might be appropriate for your individual circumstances.
- 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.
Do protein smoothies alone help you lose weight?
Protein smoothies can support weight loss by increasing satiety and reducing hunger, but they're not a standalone solution. Weight loss requires a calorie deficit—you still need to eat fewer calories overall. Smoothies are most effective when part of a broader healthy eating plan that includes regular physical activity.
How much protein should a weight loss smoothie contain?
Aim for 20–30g of protein per smoothie. This might come from Greek yoghurt, whey protein powder, plant-based protein powder, or natural sources like nuts and seeds. Combine protein with whole food ingredients and fibre (oats, berries, leafy greens) for maximum satiety and nutrition.
Can I lose weight with smoothies and no exercise?
Weight loss is possible with calorie deficit alone, but the NHS recommends combining dietary changes with increased physical activity. Exercise supports heart health, builds muscle, and makes weight loss more sustainable. Even modest activity like brisk walking 150 minutes per week helps.
What if protein smoothies and diet changes aren't working?
If you've followed a reduced-calorie diet and increased activity without success, speak to your GP. You may be eligible for prescription weight loss medication through NHS specialist services or private prescribing. Use our GLP-1 weight loss calculator to explore what medication-supported weight loss might achieve for you.
How do I know if I'm eligible for NHS weight loss medication?
NHS prescription weight management is typically available to adults with a BMI of 30 or above, or 27–29.9 with weight-related conditions. Eligibility varies by region and requires referral to specialist tier 3 weight management services. Ask your GP to discuss your options and whether a specialist referral 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.