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 Meal Prep: Planning Nutrition for Success
Meal prep is one of the most effective strategies for sustainable weight loss in the UK. By planning and preparing your meals in advance, you remove barriers to healthy eating, control portion sizes, and stay consistent with your nutrition goals. Whether you're managing your weight independently or alongside prescription weight loss medication, structured meal planning supports long-term success. This guide covers practical meal prep strategies aligned with NHS weight management guidance.
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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.
How Meal Prep Supports Weight Loss Goals
Meal prep creates a structured approach to eating that aligns with healthy weight management. When meals are planned and prepared ahead, you're less likely to reach for convenience foods high in calories and low in nutrition. This is particularly valuable if you're following a reduced-calorie diet, which the NHS recommends for sustainable weight loss of 0.5–1 kg per week.
Key benefits of meal prep for weight management:
- Portion control — pre-portioned meals prevent overeating and help create the calorie deficit needed for weight loss
- Consistency — having healthy meals ready supports adherence to your eating plan over weeks and months
- Cost savings — bulk cooking is more economical than daily takeaways and convenience meals
- Time efficiency — cooking once saves time throughout the week
- Nutritional balance — you can ensure each meal includes protein, fibre, and vegetables for sustained fullness
If you're taking prescription weight loss medication like GLP-1 injections, meal prep becomes even more valuable. These medications may reduce appetite, so having smaller, nutrient-dense meals ready supports your body's signals and prevents nausea from eating too quickly.
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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.
Practical Meal Prep Strategies for UK Weight Management
Start by choosing 2–3 lean protein sources (chicken, turkey, fish, lentils), 2–3 whole grains or starchy vegetables (brown rice, sweet potato, oats), and a variety of vegetables. Batch-cook proteins and grains on a Sunday, then combine them into different meals throughout the week to maintain variety and adherence. Use our free BMI calculator to establish your current weight baseline, then track your progress weekly using our progress tracker as you implement meal prep alongside your weight management plan.
Store meals in glass containers in the fridge (typically 3–4 days) or freezer (up to 3 months). Include snack options like Greek yoghurt, nuts, and fruit to prevent impulsive food choices between meals. The NHS weight loss programme emphasises that sustainable weight management combines healthy eating with gradual activity increases — meal prep is the eating foundation that makes this possible.
- 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 each week?
Most people find success prepping 3–5 days of meals at a time, typically on Sunday or a convenient day off. This prevents meals spoiling while maintaining freshness. Start with 3 days if you're new to meal prep, then increase as you develop a routine. Adjust based on your fridge space and how varied you want your meals to be throughout the week.
Can meal prep support weight loss alongside prescription medication?
Yes. If you're taking prescription weight loss injections like GLP-1 medication, meal prep is especially helpful. These medications reduce appetite and slow gastric emptying, so having smaller, nutrient-dense meals ready prevents overeating and manages potential nausea. Always combine medication with lifestyle changes including meal planning for best results.
What foods should I prioritise for weight loss meal prep?
Focus on high-protein foods (chicken, fish, eggs, legumes) for fullness, whole grains for sustained energy and fibre, and plenty of vegetables for volume with few calories. Include healthy fats like olive oil and avocado in moderation. Avoid ultra-processed foods, sugary sauces, and high-calorie oils. The NHS recommends a balanced approach rather than extreme restriction for sustainable weight management.
How does meal prep fit with NHS weight management guidance?
The NHS recommends a calorie deficit of approximately 500 kcal per day for 0.5 kg weekly weight loss. Meal prep makes this achievable by giving you full control over portion sizes and ingredients. When you prepare meals at home, you reduce hidden calories from restaurant cooking methods and can accurately track your intake to support your weight loss goals.
Can I meal prep if I'm doing intermittent fasting for weight loss?
Yes. Meal prep works well with intermittent fasting — you can prepare your eating-window meals in advance. This ensures you eat nutritious, balanced food during your eating period rather than grabbing processed options. Combine meal prep with the free progress tracker on MyWeightCheck to monitor whether intermittent fasting supports your weight loss and how your BMI changes over time.
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.