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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Prepared Weight Loss Meal Delivery and Prescription Options in the UK
Prepared weight loss meal delivery services can be a useful tool for weight management in the UK, offering portion-controlled meals that support a reduced-calorie diet. However, for eligible adults, prescription weight loss medications such as Mounjaro and Wegovy may also help. This guide covers what prepared meal delivery involves, the UK-licensed prescription options available, and how to find out if you're eligible for medication-based weight management support.
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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 Prescription Weight Loss Medications
For adults with excess weight, the NHS offers several pathways to support. The most commonly prescribed UK-licensed weight loss medications include:
- Mounjaro (tirzepatide) — a once-weekly dual GIP and GLP-1 receptor agonist injection. Clinical trials showed participants lost an average of 15–21% of their body weight, though individual results vary significantly.
- Wegovy (semaglutide) — a once-weekly GLP-1 receptor agonist. In clinical trials, users lost approximately 15% of body weight on average alongside lifestyle changes.
- Saxenda (liraglutide) — a once-daily GLP-1 injection, available through NHS specialist weight loss services and privately.
All three are prescription-only medicines requiring clinical assessment before prescription. Use our free GLP-1 weight loss calculator to estimate potential weight loss outcomes at different medication doses.
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 Finding Out If You're Eligible
In the UK, weight management medication is available through two routes. NHS access: Referral to a tier 3 specialist weight management service through your GP. Availability and waiting times vary significantly by region. Private access: Through GPhC-registered online prescribers following an online clinical assessment—available without NHS referral.
You're likely 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. Check your personal BMI using our free BMI calculator above, then discuss prescription weight management options with your GP alongside prepared meal delivery as part of a comprehensive approach to weight loss.
- 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.
How do prepared weight loss meals work alongside prescription weight loss medication?
Prepared meal services provide portion-controlled, calorie-counted meals that support the reduced-calorie diet recommended when taking GLP-1 medications. The medication may help reduce appetite, while the meals ensure you're consuming appropriate calories for sustainable weight loss. Together, they create a structured approach to weight management.
Is Mounjaro or Wegovy available on the NHS for weight loss?
Yes, both Mounjaro and Wegovy are available through NHS tier 3 specialist weight management services for eligible adults. However, NHS availability varies by region and waiting lists can be lengthy. Private prescribing is also available through UK-licensed online prescribers.
What BMI do I need to be eligible for weight loss medication in the UK?
You're typically eligible if your BMI is 30 or above, or 27–29.9 with at least one weight-related health condition (such as type 2 diabetes, hypertension, or sleep apnoea). For South Asian, Chinese, Black African, or Black Caribbean adults, eligibility may begin at a lower BMI. Your GP can assess your individual eligibility.
Can prepared meal delivery alone help me lose weight without medication?
Yes, prepared meal services can support weight loss by providing portion control and reducing decision fatigue around meals. However, sustainable weight loss also requires a calorie deficit of approximately 500 kcal per day. Prescription weight loss medication is optional—your GP can discuss all available options based on your individual health and circumstances.
How quickly can I expect to lose weight with GLP-1 medication and meal delivery?
The NHS recommends a sustainable weight loss rate of 0.5–1 kg per week. With GLP-1 medication combined with a reduced-calorie diet and meal delivery, results vary based on individual factors. Use our GLP-1 weight loss calculator and track your progress with our free progress tracker to monitor your journey.
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.