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 Meal Prep Delivery in the UK — Plus Medication Options
Meal prep delivery services are popular for weight management in the UK, but prescription weight loss medication may also support your goals if you're eligible. This guide covers UK-licensed options including Mounjaro and Wegovy, how they work alongside diet changes, and whether you might qualify. Weight management works best when you combine healthy eating habits with other approaches — whether that's structured meal prep, increased physical activity, or prescription medication prescribed by a healthcare professional. Understanding all your options helps you make informed choices with your GP.
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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-Licensed Weight Loss Medications for Eligible Adults
Three prescription-only medications are licensed in the UK specifically for weight management: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These are not alternatives to meal prep delivery — they're prescription medicines that work by helping regulate appetite and reduce food cravings, typically used alongside a reduced-calorie diet and increased physical activity.
- Mounjaro is a dual GIP and GLP-1 receptor agonist, injected once weekly. Clinical trials showed participants lost an average of 15–21% of their body weight over 72 weeks, though individual results vary significantly.
- Wegovy is a GLP-1 receptor agonist, also injected once weekly. In clinical trials, participants lost an average of approximately 15% of their body weight.
- Saxenda is a daily GLP-1 injection, often used when weekly injections aren't suitable.
All require a prescription from a UK-licensed prescriber following a clinical assessment. They're not available over the counter or through standard GP prescription — access is typically through NHS specialist weight management services or private online prescribing.
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.
Eligibility and How to Access Weight Loss Medication in the UK
You may be eligible for prescription weight loss medication if you have a BMI of 30 or above, or 27–29.9 with at least one weight-related health condition (such as type 2 diabetes, high blood pressure, or sleep apnoea). For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds may apply.
On the NHS, access is through specialist tier 3 weight management services — speak to your GP about a referral. Waiting times vary by region. Alternatively, private prescribing is available through GPhC-registered online services following a clinical assessment. Calculate your BMI using our free BMI calculator above to check where you fall. Whether you use meal prep delivery, a weight loss calculator to track potential outcomes, or prescription medication, combining approaches often gives the best results.
- 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 use meal prep delivery services and weight loss medication together?
Yes. Prescription weight loss medications like Mounjaro and Wegovy work best alongside a reduced-calorie diet and increased physical activity. Structured meal prep services can support this by providing portion-controlled, balanced meals. Always inform your prescriber about any dietary changes or supplements you're using.
How do I know if I'm eligible for weight loss medication on the NHS?
Generally, you need a BMI of 30 or above, or 27–29.9 with weight-related health conditions. Speak to your GP, who can assess you and refer you to a specialist weight management service if appropriate. Our free BMI calculator can help you check your current BMI first.
What's the difference between Mounjaro and Wegovy?
Both are GLP-1 medications injected once weekly, but Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro showed slightly higher average weight loss in trials, but individual results vary. Your prescriber will discuss which is more suitable for you.
How much does weight loss medication cost privately in the UK?
Prices vary by provider and dose, typically ranging from approximately £129–£320 per month. NHS availability depends on your region and local ICB funding. Ask your GP about NHS options in your area, as waiting lists and eligibility vary significantly.
Will weight loss medication work without changing my diet?
Prescription weight loss medications are designed to be used alongside dietary changes and increased physical activity — not as a replacement for them. The medication helps reduce appetite and cravings, but sustainable weight loss requires a combined approach including calorie deficit and lifestyle changes.
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.