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
Easy Fruit Smoothie Recipes for Weight Loss
Fruit smoothies can be a practical part of a weight loss strategy when made with the right ingredients and portion sizes. Combined with a balanced diet and lifestyle changes, smoothies help you feel fuller for longer whilst keeping calories in check. For adults struggling with weight management in the UK, prescription options like Mounjaro and Wegovy are also available alongside healthier eating habits. Our free weight loss calculator can help you explore what medication support might mean for your goals.
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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.
Weight Loss Medication Available in the UK
For adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions, prescription weight management medications are available in the UK. Three main options are currently licensed:
- Mounjaro (tirzepatide) — once-weekly GIP and GLP-1 injection. Clinical trials showed average weight loss of 15–21% body weight alongside diet and exercise.
- Wegovy (semaglutide) — once-weekly GLP-1 injection. Average weight loss in trials was around 15% of body weight.
- Saxenda (liraglutide) — daily GLP-1 injection, an older option still available on the NHS and privately.
All three work by reducing appetite and supporting feeling fuller after smaller meals. Individual results vary significantly, and these medications work best combined with lifestyle changes, including healthier eating habits like incorporating balanced smoothies into your diet.
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.
How to Access Weight Loss Medication in the UK
The NHS provides weight loss medication through specialist tier 3 weight management services, though availability and waiting times vary significantly by region. Your GP can discuss whether you might be eligible and refer you if appropriate. Privately, prescription weight loss treatment is available through UK-licensed online prescribers following a clinical assessment — no NHS referral is needed.
Whether you choose medication or focus on lifestyle changes alone, combining healthy eating strategies like making low-calorie smoothies with increased physical activity gives the best results. Use our free BMI calculator to check your starting point, then speak with your GP about what options suit your 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.
Can fruit smoothies alone help me lose weight?
Fruit smoothies can support weight loss as part of a calorie-controlled diet, but they work best combined with overall lifestyle changes. Smoothies made with whole fruits, Greek yoghurt, and limited added sugar are more filling and nutritious. However, if you have a BMI over 30, prescription medication like Mounjaro or Wegovy may provide additional support alongside dietary changes.
What are the best fruits for weight loss smoothies?
Berries (blueberries, strawberries, raspberries), apples, and pears are excellent choices — they're high in fibre, lower in calories, and help you feel fuller longer. Avoid adding sugary fruit juices or sweetened yoghurt. Use unsweetened yoghurt, milk, or unsweetened almond milk as your base. Our weight loss calculator can help you see if medication might complement your smoothie and exercise routine.
Am I eligible for weight loss medication on the NHS?
You may be eligible if you have a BMI of 30 or above, or 25–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Eligibility varies by region and through specialist services. Your GP can assess whether you qualify and refer you to tier 3 weight management services if appropriate.
How does GLP-1 medication work alongside diet changes?
GLP-1 injections like Wegovy or Mounjaro work by reducing appetite and slowing digestion, making it easier to eat less and feel satisfied. They're designed to work alongside healthy eating habits — not replace them. Smoothies, balanced meals, and increased activity are still essential. Individual weight loss results vary based on personal factors.
What's the difference between NHS and private weight loss medication?
NHS access is through specialist tier 3 services (often with waiting lists), available at no cost if eligible. Private access is faster through online UK prescribers, typically costing £130–£320 monthly depending on dose. Both require clinical assessment and prescription. Your GP can discuss which route is suitable for your circumstances.
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.