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 Prepared Meals Delivery and Prescription Options in the UK
Prepared meal services can be a helpful tool for weight management in the UK, but they work best alongside other approaches. For eligible adults, prescription weight loss medications—including Mounjaro (tirzepatide) and Wegovy (semaglutide)—may provide additional support. These GLP-1 and dual-action medications are licensed in the UK and available through NHS specialist services or private prescribing. This guide explains how prepared meals fit into a broader weight management strategy and what prescription options are available to you.
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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
If you're exploring weight management in the UK, prescription medications are now available alongside lifestyle changes like prepared meal delivery. Three main options are licensed for weight loss:
- Mounjaro (tirzepatide) — a once-weekly GLP-1 and GIP dual receptor agonist, average weight loss 15–21% of body weight in clinical trials
- Wegovy (semaglutide) — a once-weekly GLP-1 injection, average weight loss around 15% in clinical trials
- Saxenda (liraglutide) — a daily GLP-1 injection, lower average weight loss but an established option
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, high blood pressure, or sleep apnoea. Individual results vary significantly, and medications work best combined with reduced-calorie diet and increased physical activity—exactly where prepared meals can help. Calculate your personal BMI using our free BMI calculator above to see where you stand.
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.
Accessing Prescription Weight Loss: NHS vs Private
NHS access: Available through tier 3 specialist weight management services following a GP referral. Waiting times vary significantly by region (integrated care board), and availability is limited in some areas. Your GP can discuss eligibility and refer you if appropriate.
Private access: Available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. No NHS referral needed, though costs typically range from £129–£320 monthly depending on medication and dose.
Whichever route you choose, prescription medication should complement—not replace—lifestyle changes including healthy eating, portion control (where prepared meals help), and physical activity. Use our free GLP-1 weight loss calculator above to explore potential outcomes at different doses, and our progress tracker to monitor your journey.
- 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 prepared meal delivery alone help me lose weight?
Prepared meals can support weight loss by controlling portion sizes and calorie intake, but they're most effective combined with physical activity and behavioural changes. For some people, prescription medication alongside prepared meals may provide additional help. Your GP can advise what's right for your circumstances.
Am I eligible for prescription weight loss medication in the UK?
You may be eligible if you have a BMI of 30 or above, or 27 or above with weight-related health conditions (diabetes, high blood pressure, sleep apnoea). South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds. A prescriber will assess your individual health during consultation.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist with slightly higher average weight loss (15–21%) than Wegovy (semaglutide), which is a GLP-1 agonist only (average 15%). Both are once-weekly injections. Individual results vary, and your prescriber will recommend what's suitable for you.
How quickly will I lose weight on prescription medication?
Clinical trials show weight loss typically begins within weeks, with progressive loss over months. Average loss is 15–21% of body weight over 68–72 weeks on maximum doses, but individual results vary significantly. Combining medication with prepared meals, reduced calories overall, and activity maximises results.
How do I start the process of getting prescription weight loss medication?
Speak to your GP about your weight management goals. They can assess your eligibility and either refer you to NHS specialist services (tier 3) or discuss private options. Private consultations are available online through regulated pharmacies without NHS referral. Both routes require a clinical assessment before prescription.
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.