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
Free tracker included with every download this week
Best Weight Loss Meal Prep for UK Adults
Meal prep is a proven strategy for sustainable weight management in the UK, helping you control portions, reduce impulse eating, and stay consistent with a reduced-calorie diet. This guide covers practical meal prep approaches alongside information on prescription weight loss options available through the NHS and private prescribers. For eligible adults, combining meal planning with medication support like Mounjaro or Wegovy may enhance results. Use our BMI calculator to check where you currently stand, and our GLP-1 weight loss calculator to explore how prescription options might fit into your weight management plan.
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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.
Effective Meal Prep Strategies for Weight Loss
Successful weight loss meal prep starts with planning your weekly meals to avoid unplanned takeaways and high-calorie choices. Batch-cook proteins like chicken, fish, and lentils on Sundays, and prepare vegetables in bulk to mix throughout the week. Aim for meals around 500–600 calories with balanced macronutrients: lean protein, whole grains, and plenty of vegetables.
- Portion control: Use containers of consistent sizes to maintain awareness of portion sizes and hit your calorie targets
- Prep vegetables early: Chop and store raw vegetables to make healthy choices quick and accessible
- Choose sustainable options: Prepare foods you genuinely enjoy — if your meal prep feels like a chore, you won't stick with it
- Freeze in batches: Make multiple portions and freeze for weeks when busy — this supports consistent calorie intake for sustainable weight loss
Evidence shows that structured meal prep supports consistent adherence to a reduced-calorie diet, which is essential for achieving and maintaining weight loss results.
Clinically BackedWeight Loss
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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.
UK Prescription Weight Management Options
For eligible adults, prescription weight loss injections like Mounjaro (tirzepatide) and Wegovy (semaglutide) are available through the NHS and private prescribers. These GLP-1 and dual GIP/GLP-1 medications help reduce appetite and support feeling fuller after meals — complementing your meal prep efforts. Eligibility typically requires a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure.
NHS access is through specialist tier 3 weight management services, though waiting times vary by region. Private prescribing is available without NHS referral following an online clinical assessment. Whether you choose meal prep alone or combine it with prescription weight management, your GP can advise what's appropriate for your individual health situation.
- 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 meal prep alone help me lose weight without medication?
Yes — meal prep supports sustainable weight loss through portion control and consistent calorie intake. The NHS recommends losing 0.5–1 kg per week, which is achievable with meal planning and increased physical activity. However, some people benefit from prescription medication alongside lifestyle changes. Your GP can discuss what approach suits your circumstances.
What is a realistic calorie target for weight loss meal prep?
A calorie deficit of approximately 500 kcal per day typically results in losing around 0.5 kg per week. For most UK adults, this means aiming for 1,500–1,800 calories daily, depending on your current weight and activity level. Use our BMI calculator to establish your baseline, then consult your GP or a registered dietitian for personalised targets.
How do Mounjaro and Wegovy support weight loss alongside meal prep?
Both medications are GLP-1 receptor agonists (Mounjaro is also a GIP agonist) that reduce appetite and help you feel fuller after smaller meals — making it easier to stick to your meal prep calorie targets. Clinical trials showed participants lost 15–21% of body weight on average, though individual results vary. They work best combined with meal prep and physical activity, not instead of it.
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. NHS access is through specialist weight management services — ask your GP for a referral. Alternatively, private prescribing is available without NHS referral for eligible adults. Your GP can assess your individual eligibility.
Should I start meal prep or medication first?
Most UK health services recommend starting with meal prep and lifestyle changes. If these alone don't achieve your goals after 12 weeks, or if you're eligible and interested, prescription medication can be added alongside continued meal prep. This combined approach typically produces the best results. Discuss with your GP what's appropriate for your health situation.
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.