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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Two Week Weight Loss Meal Plan: UK Options & Prescription Support
Planning a two week weight loss meal plan in the UK? While meal planning and calorie control are key foundations, many people achieve better results when combining dietary changes with prescription weight loss support. This guide covers practical meal planning strategies alongside information about UK-licensed prescription options like Mounjaro and Wegovy that may help eligible adults manage their weight more effectively. Your GP can assess whether medication might support your weight management journey.
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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 Prescription Weight Loss Options for Weight Management
For eligible UK adults, prescription weight loss medications offer evidence-based support alongside meal planning. Three options are currently licensed in the UK:
- Mounjaro (tirzepatide) — dual GIP and GLP-1 receptor agonist. Clinical trials showed average weight loss of approximately 15–21% body weight at the maximum dose, alongside a reduced-calorie diet and physical activity.
- Wegovy (semaglutide) — GLP-1 receptor agonist. Once-weekly injection. Average weight loss around 14.9% body weight in clinical trials.
- Saxenda (liraglutide) — GLP-1 receptor agonist. Once-daily injection. Effective for weight management in eligible adults.
All three are prescription-only medicines requiring clinical assessment. Eligibility typically requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, or cardiovascular disease. Your GP can advise whether you might be eligible and refer you for specialist assessment.
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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.
Getting Started: NHS vs Private Prescription Routes
If you're interested in prescription weight loss support in the UK, two routes are available:
- NHS route: Speak to your GP who can refer you to your local tier 3 specialist weight management service. NHS access varies by region and may involve waiting lists.
- Private route: Licensed online prescribers can assess your eligibility following an online clinical consultation. Available without NHS referral, though you'll pay privately (typically £129–£320+ per month depending on medication and dose).
Either way, prescription weight loss medication works best alongside a reduced-calorie diet, increased physical activity, and behavioural support. This combination approach is far more effective than medication alone. Use our free BMI calculator to check your current BMI — this helps determine eligibility for prescription options.
- 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.
What should a two week weight loss meal plan include?
A sustainable two week meal plan should create a modest calorie deficit (around 500 kcal per day for 0.5 kg weekly loss), include plenty of vegetables, lean protein, whole grains, and healthy fats, and be realistic enough to follow long-term. The NHS recommends losing no more than 0.5–1 kg per week. Track your meals using our free progress tracker to monitor your weight loss and identify patterns.
Can I use a meal plan alone to lose weight, or do I need medication?
Meal planning and lifestyle changes are the foundation of sustainable weight loss. Prescription weight loss medication like Mounjaro or Wegovy is not required but may help if you're eligible and have tried diet and exercise without sufficient results. Medication works best combined with a reduced-calorie diet and physical activity, not instead of them.
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 BMI of 27–29.9 with a weight-related health condition (type 2 diabetes, high blood pressure, cardiovascular disease, or sleep apnoea). Lower BMI thresholds apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. Your GP can assess your individual eligibility.
How long should I follow a weight loss meal plan?
A two week meal plan is typically a starting point. Sustainable weight loss requires ongoing dietary changes, not just two weeks. Most health professionals recommend planning for at least 12 weeks of consistent effort. Use our GLP-1 weight loss calculator to estimate realistic timelines if you're considering prescription support.
What's the difference between NHS and private prescription weight loss options?
NHS weight loss medication is available through specialist tier 3 services (accessed via GP referral) but may have long waiting lists. Private prescription options are available through online prescribers without referral, but you'll pay privately. Both require clinical assessment and work best with lifestyle changes. Individual results vary considerably.
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.