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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Meal Prep Delivery and Weight Loss Medication in the UK
Meal prep delivery services can support weight management by removing meal planning stress, but prescription weight management medication may also be available to eligible UK adults. This guide explains how meal prep fits alongside UK-licensed weight loss options like Mounjaro and Wegovy, NHS eligibility criteria, and how to find out if prescription support is right for you. Whether you choose to use a meal prep service alone or combine it with clinical treatment, understanding all your options helps you make an informed decision about your weight management journey.
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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 Options
For eligible UK adults, prescription weight loss medications offer clinical evidence of effectiveness alongside lifestyle changes like meal prep delivery. Three main options are licensed in the UK: Mounjaro (tirzepatide), a once-weekly injection that activates dual GIP and GLP-1 pathways; Wegovy (semaglutide), a once-weekly GLP-1 injection; and Saxenda (liraglutide), a daily GLP-1 injection. In clinical trials, Mounjaro helped participants lose an average of 15–21% of their body weight, while Wegovy showed average weight loss of around 15% — though individual results vary significantly.
These medications work best when combined with a reduced-calorie diet and increased physical activity, which is where meal prep services excel. Eligibility typically requires a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Adults of South Asian, Chinese, Black African, or Black Caribbean heritage may qualify at lower BMI thresholds due to higher cardiovascular risk at those levels.
All prescription weight loss medications require a clinical assessment from a licensed prescriber before dispensing. You can use our free GLP-1 weight loss calculator above to estimate potential outcomes at different doses, and our BMI calculator to check your starting point.
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 and Private Access Routes in the UK
NHS access: Weight loss medication is available through specialist tier 3 weight management services following GP referral. Availability varies significantly by region, and waiting lists can be lengthy. Your GP can advise whether your local integrated care board offers these services and whether you meet clinical thresholds.
Private access: Prescription weight loss treatment is available through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. This route does not require NHS referral and is often faster, though costs vary by medication and dose. Combined with a meal prep delivery service, this integrated approach gives you structured nutrition support plus clinical medication management. Start by discussing your weight management goals with your GP, who can advise on NHS eligibility and refer you to specialist services if appropriate.
- 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 with weight loss injections?
Yes. Prescription weight loss medications like Mounjaro and Wegovy work alongside dietary changes. Meal prep delivery can support this by providing portion-controlled, nutritious meals that fit within the calorie deficit needed for weight loss. Discuss your meal plan with your prescriber to ensure it aligns with your medication.
Who is eligible for weight loss medication in the UK?
Adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, sleep apnoea), may be eligible. South Asian, Chinese, Black African, or Black Caribbean adults may qualify at lower BMI thresholds. Your GP or a prescriber will assess individual eligibility following a clinical consultation.
What's the difference between Mounjaro and Wegovy for weight loss?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist only. In trials, Mounjaro showed slightly higher average weight loss (15–21% vs 15%), though results vary. Both are once-weekly injections. Your prescriber will recommend the most appropriate option based on your health.
How do I access weight loss medication through the NHS?
Ask your GP to refer you to your local specialist weight management service (tier 3). Eligibility and availability vary by region. Waiting times can be significant in some areas. Your GP will advise whether NHS provision is available in your area and whether you meet clinical criteria.
Can I get weight loss medication privately without an NHS referral?
Yes. Private online pharmacies dispensing prescriptions from UK-licensed prescribers can provide weight loss medications like Mounjaro and Wegovy following an online clinical assessment. This route does not require NHS referral, though you'll need to pay privately. Costs typically range from £129–£320 per month depending on medication and dose.
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.