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
Meal Prep Ideas for Weight Loss — UK Guide
Meal prepping is one of the most effective ways to support sustainable weight loss in the UK. By preparing healthy meals in advance, you reduce the temptation to reach for high-calorie convenience foods and maintain better portion control. Whether you're managing weight through diet alone or combining meal prep with prescription weight management medication like Mounjaro or Wegovy, having nutritious meals ready makes it easier to stay on track. This guide covers practical meal prep strategies alongside information about weight management options available to eligible UK adults.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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
Start with a simple framework: Choose a protein base (chicken, fish, eggs, legumes), add a complex carbohydrate (brown rice, sweet potato, oats), and include plenty of vegetables for volume and nutrients. This combination keeps you fuller for longer and supports a moderate calorie deficit—the foundation of sustainable weight loss.
Batch cooking tips:
- Prep 3–4 protein sources at the start of the week
- Cook grains in bulk and divide into containers
- Chop vegetables and store in airtight containers (typically last 3–5 days)
- Use portion-controlled containers to track intake accurately
- Label and date everything to avoid food waste
The NHS recommends losing 0.5–1 kg per week for sustainable results. Meal prepping makes this achievable by removing daily decision-making and keeping calorie intake consistent. Try our free BMI calculator to establish your baseline, then use our weight converter to track progress in stone and pounds.
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.
Prescription Weight Management Options Available in the UK
For eligible adults, prescription weight management medications can support meal prep efforts. Three options are currently licensed in the UK: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These work alongside reduced-calorie diet and increased physical activity.
Eligibility criteria: Adults with a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea, may be eligible. Access is available through NHS specialist tier 3 weight management services or private online prescribing following a clinical assessment. Your GP can refer you to specialist services, or you can explore private options directly. Our GLP-1 weight loss calculator can help you understand potential outcomes if you're considering medication alongside your meal prep routine.
- 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 much should I eat per day when meal prepping for weight loss?
A calorie deficit of around 500 kcal per day typically results in approximately 0.5 kg per week weight loss. For most UK adults, this equates to 1,500–1,800 kcal daily, but individual needs vary by age, activity level, and metabolism. Your GP or a registered dietitian can provide personalised guidance. If you're on prescription weight management medication, your prescriber will give specific dietary recommendations.
Can I meal prep if I'm taking Mounjaro or Wegovy for weight loss?
Yes, absolutely. Prescription weight loss medications work best when combined with dietary changes and increased physical activity. Meal prepping fits perfectly into this approach—having nutritious, controlled-portion meals ready means you're less likely to miss doses by forgetting to eat, and you maintain consistent, healthy food choices. Always follow your prescriber's dietary guidance.
What are the best proteins for weight loss meal prep?
Lean proteins are ideal: chicken breast, fish (salmon, cod, tuna), turkey, eggs, and plant-based options like lentils and tofu. These are high in protein, which keeps you fuller longer and supports muscle preservation during weight loss. Aim for 100–150g per meal depending on your calorie target. Batch cooking proteins on Sunday makes the week much easier.
How do I know if I'm eligible for prescription weight loss treatment in the UK?
You're potentially eligible if you have a BMI of 30 or above, or 27 or above with weight-related conditions. Start by speaking to your GP about your weight management goals—they can assess your suitability and refer you to specialist services if appropriate. Alternatively, private prescribers offer online consultations. Use our free BMI calculator to check your current BMI first.
How long should I meal prep for—a week or longer?
One week is standard for most meal prep, as food freshness and safety are important. Cooked proteins and vegetables typically last 3–5 days in the fridge. You can freeze portions for later in the week or prepare fresh batches mid-week. For longer prep, freeze individual portions in airtight containers—they'll last up to 3 months. Always label with the date and contents.
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.