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 and Prescription Medication in the UK
Weight loss meal prep delivery services can support your nutrition goals, but they work best alongside other weight management approaches. For many UK adults, prescription weight management medication — including GLP-1 injections like Mounjaro and Wegovy — offers an evidence-based complement to dietary changes. This guide covers how meal planning fits into a comprehensive weight loss strategy, what prescription options are available in the UK, and how to find out if you're eligible.
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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 Options
If you're looking to lose weight in the UK, prescription medications can support your efforts alongside meal planning and physical activity. Mounjaro (tirzepatide) and Wegovy (semaglutide) are GLP-1 receptor agonist medications licensed in the UK for weight management. Mounjaro is a dual GIP and GLP-1 agonist, whilst Wegovy is a GLP-1 agonist only. Clinical trials showed that people using these medications alongside a reduced-calorie diet lost an average of 15–21% of their body weight over approximately one year — though individual results vary significantly.
Eligibility for prescription weight loss medication requires a BMI of 30 or above, or 27 or above if you have weight-related health conditions 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 due to higher health risks at lower weights. Both medications are prescription-only and require a clinical assessment before being prescribed. Calculate your personal BMI using our free BMI calculator above to understand where you sit on the NHS weight management scale.
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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.
NHS vs Private Access and How to Get Started
In the UK, you can access prescription weight loss medication through two routes. The NHS route involves referral to a specialist tier 3 weight management service through your GP. However, NHS availability varies significantly by region and waiting lists can be substantial. The private route is available through online consultations with UK-licensed prescribers and GPhC-registered pharmacies — no NHS referral required. Either way, a qualified healthcare professional will assess whether medication is suitable for your individual health situation.
If you're considering prescription weight loss medication, start by speaking with your GP about your weight management goals. They can assess your eligibility, discuss whether medication is appropriate alongside meal prep delivery services, and either refer you to NHS specialist services or signpost you to private options. Use our GLP-1 weight loss calculator to explore potential outcomes at different doses, and track progress with our free progress tracker once you start any intervention.
- 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 does GLP-1 weight loss medication work alongside meal prep?
GLP-1 medications reduce appetite and help you feel fuller after smaller meals — meal prep delivery services then make it easier to stick to appropriate portion sizes and nutritious choices. They work synergistically: the medication supports reduced calorie intake, and prepared meals remove the barrier of meal planning and cooking.
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 or above with weight-related health conditions like type 2 diabetes. Eligibility varies by region. Your GP can assess whether you meet criteria for NHS specialist services, or you can access private prescribing following an online clinical assessment.
What's the difference between Mounjaro and Wegovy?
Both are GLP-1-based medications licensed for weight management in the UK. Mounjaro is a dual GIP and GLP-1 agonist with doses up to 15mg; Wegovy is GLP-1 only with a maximum of 2.4mg. Clinical trials showed Mounjaro resulted in slightly higher average weight loss, but individual results vary and both are effective.
Can I use meal prep delivery instead of prescription medication?
Meal prep services are a helpful tool for weight management, but they work best as part of a comprehensive approach. Prescription medications can enhance results for eligible individuals. The most effective strategy combines dietary support (including meal prep), physical activity, and — where appropriate — evidence-based medication. Your GP can advise what's best for your situation.
How quickly will I lose weight with prescription medication?
Safe and sustainable weight loss is typically 0.5–1 kg per week. With GLP-1 medication and a reduced-calorie diet, clinical trial participants averaged 15–clinically studied weight loss over 52–72 weeks. However, results vary between individuals depending on starting weight, adherence, diet, and exercise. Track your personal progress with our free progress tracker.
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.