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
Food Prep Ideas For Weight Loss
Meal preparation is one of the most effective strategies for sustainable weight loss. By planning and preparing meals in advance, you can control portion sizes, reduce calorie intake naturally, and avoid impulsive high-calorie choices. Whether you're managing your weight through lifestyle changes alone or alongside prescription weight loss medication, smart food prep supports your goals. This guide covers practical, evidence-backed food prep ideas aligned with NHS weight management principles.
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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.
Smart Food Prep Strategies for Weight Loss
Portion control through prep: Pre-portioning meals into containers makes it easier to stick to calorie targets. A sustainable calorie deficit of around 500 kcal per day typically results in approximately 0.5 kg weight loss weekly — the NHS-recommended safe rate. When you prepare food ahead, you're less likely to overeat or reach for high-calorie alternatives.
Batch cooking basics: Cook large portions of lean proteins (chicken, fish, lentils), vegetables, and whole grains on one day. Store in the fridge (3–4 days) or freezer (up to 3 months). This approach saves time and ensures healthy options are always available.
Ingredient choices that support weight loss: Focus on protein-rich foods (keep you fuller longer), high-fibre vegetables (low calorie, high satiety), and whole grains instead of refined carbohydrates. Avoid ultra-processed foods, which are calorie-dense and less filling.
Hydration and seasoning: Prep plenty of water and use herbs and spices rather than high-calorie sauces and oils. This maximises flavour without excess calories.
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.
Food Prep for Weight Management Medication Users
If you're taking prescription weight loss medication such as GLP-1 injections (Mounjaro or Wegovy), food prep becomes even more valuable. These medications reduce appetite and help you feel fuller with smaller portions — but having nutritious, pre-portioned meals ready means you can eat when hungry without defaulting to convenience foods. This supports consistent weight loss results alongside the medication's effects.
Use our free GLP-1 weight loss calculator to see projected weight loss at different doses, then align your meal prep approach with those goals. Track your progress with our progress tracker to identify which food prep strategies work best for your individual weight loss journey.
Key tip: Prepare variety. Eating the same meals every day is unsustainable. Prep 2–3 protein options, 3–4 vegetable combinations, and 2 carbohydrate choices each week to stay motivated.
- 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 many meals should I prep per week for weight loss?
Most people find success prepping 5–7 breakfasts, lunches, and dinners. This covers most weekdays with flexibility for dining out or social meals on weekends. Start with 3–4 days of prep to build the habit, then expand. Use our BMI calculator to check your current starting point, then track progress weekly.
What's the best calorie range for weight loss?
NHS guidance recommends a calorie deficit of approximately 500 kcal per day for sustainable loss of 0.5–1 kg weekly. However, individual needs vary based on age, height, activity level, and metabolism. Your GP can advise on a safe calorie range for you personally.
Can I use food prep if I'm taking weight loss injections?
Yes, absolutely. Pre-portioned meals work particularly well with GLP-1 medications because you're likely to eat smaller portions anyway. Having healthy, prep options ready prevents you from choosing high-calorie alternatives when appetite is reduced. This supports consistent weight loss results.
How should I store prepped meals to keep them fresh?
Store in airtight containers in the fridge for 3–4 days, or freeze for up to 3 months. Label containers with the date. Proteins and vegetables freeze well; cooked grains last 4–5 days refrigerated. Thaw overnight in the fridge before reheating.
Does food prep help if I'm also tracking my weight loss?
Yes — meal prep is one of the most effective weight loss strategies because it removes guesswork from portion control and calorie intake. Combine it with our progress tracker to monitor weekly results and identify which meal prep approaches work best for your individual weight management goals.
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.