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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Weight Loss Smoothie Drinks and UK Weight Management Options
Smoothie drinks can be a convenient way to support weight loss when made with the right ingredients—but they work best alongside other lifestyle changes. For adults in the UK looking to manage their weight, there are both dietary strategies and prescription weight management options available, depending on your individual circumstances. This guide explains how smoothies fit into a broader weight loss approach, and explores what prescription medications might be suitable for you. If you're interested in your overall weight health, try our free BMI calculator above to see where you currently stand, and our GLP-1 weight loss calculator to explore what different approaches might achieve.
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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.
UK Prescription Weight Loss Options
For adults in the UK with a BMI of 30 or above—or 27 or above with weight-related health conditions—prescription weight management medications are now available through both NHS specialist services and private prescribing.
Three main options are licensed in the UK:
- Mounjaro (tirzepatide) — a once-weekly injection that activates two hormone pathways; clinical trials showed an average weight loss of 15–21% of body weight alongside diet and exercise changes
- Wegovy (semaglutide) — a once-weekly GLP-1 injection; trials showed approximately 15% average weight loss over 68 weeks
- Saxenda (liraglutide) — a daily GLP-1 injection, an alternative for those who prefer a different dosing schedule
All three are prescription-only medicines requiring assessment by a licensed prescriber to confirm suitability. Weight loss medications work best when combined with reduced-calorie diet and increased physical activity—similar to the lifestyle support that smoothies can provide.
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.
NHS vs Private Access and Next Steps
On the NHS: Weight loss medications are available through specialist tier 3 weight management services. You'll need a referral from your GP, though waiting lists vary significantly by region and can be lengthy in some areas. Contact your local NHS integrated care board for current availability.
Privately: You can access prescription weight loss medication through a GPhC-registered online pharmacy following an online clinical assessment—without needing an NHS referral. The first step is always to speak with your GP about whether prescription weight management might be right for you, or to have a consultation with a licensed prescriber. Use our free weight converter and progress tracker to monitor your current weight and track any changes over time as you explore your options.
- 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 can support weight loss if made with whole fruits, vegetables, protein, and healthy fats while keeping calories moderate. However, sustainable weight loss typically requires a calorie deficit of around 500 kcal per day, combined with physical activity. Smoothies work best as part of a broader dietary strategy rather than as a standalone solution. For significant weight loss, many people also benefit from professional support or prescription medications if eligible.
What is the difference between Mounjaro and Wegovy for weight loss?
Both are prescription-only once-weekly injections licensed in the UK for weight management. Mounjaro (tirzepatide) activates two hormone pathways and showed average weight loss of 15–21% in trials. Wegovy (semaglutide) activates one pathway and showed approximately 15% average weight loss. Individual results vary significantly. Your prescriber will assess which is more suitable based on your health profile, medical history, and any other medications you take.
Am I eligible for prescription weight loss medication on the NHS?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea). Lower BMI thresholds apply to adults of South Asian, Chinese, Black African, or Black Caribbean heritage. Ask your GP about referral to your local specialist weight management service, as NHS access varies by region.
How do I find out if prescription weight loss medication is right for me?
Start by speaking with your GP, who can assess your health history, current medications, and weight management goals. They can refer you to NHS specialist services or discuss private options. A licensed prescriber will conduct a full clinical assessment before any prescription is issued. It's important that any medication is combined with lifestyle changes including diet and physical activity for best results.
What should I do if I'm waiting for NHS weight management services?
While waiting, focus on sustainable dietary changes—smoothies made with whole foods can be part of this—and increase physical activity where possible. Track your progress using our free progress tracker to monitor changes over time. Discuss with your GP whether private prescribing options might be available to you in the meantime, and ask for an estimated timeframe for NHS services in your area.
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.