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
What Makes a Good Weight Loss Lunch?
A good weight loss lunch balances protein, fibre, and healthy fats while keeping calories in check — typically 400–600 kcal for most adults following a weight management plan. The key is choosing whole foods that keep you satisfied until dinner, reducing the temptation to snack. Understanding what goes into a healthy lunch is essential whether you're managing your weight through NHS weight loss programmes, dietary changes, or alongside prescription weight loss medication. Use our free BMI calculator to check where you stand, and our GLP-1 weight loss calculator can help you understand how different approaches work together.
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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.
Nutritional Building Blocks for Weight Loss Lunches
A balanced weight loss lunch should contain three key components:
- Lean protein (25–35g): Chicken breast, turkey, fish, lentils, or tofu keep you full longer and preserve muscle during weight loss. Protein has the highest thermic effect, meaning your body burns calories digesting it.
- High-fibre carbohydrates (8–12g fibre): Whole grains, brown rice, sweet potatoes, and vegetables slow digestion and prevent blood sugar spikes that trigger hunger.
- Healthy fats (5–10g): Olive oil, nuts, seeds, or avocado support satiety and nutrient absorption without excess calories.
Research shows that portion control matters as much as food choice. A typical good weight loss lunch contains around 400–600 kcal. Using a smaller plate can naturally reduce portion sizes without feeling restrictive. If you're following prescription weight loss treatment like GLP-1 medication, your appetite may naturally adjust, making smaller portions feel appropriate.
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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 Weight Loss Lunch Examples for UK Adults
Simple lunch ideas that work:
- Grilled chicken salad: 150g chicken breast, mixed leaves, cherry tomatoes, olive oil dressing (~420 kcal)
- Lentil soup with wholemeal bread: Homemade or shop-bought lentil soup with one slice (~380 kcal)
- Tuna and vegetable wrap: Wholemeal wrap, tinned tuna in water, cucumber, lettuce (~450 kcal)
- Egg and vegetable stir-fry: Two eggs, broccoli, peppers, small portion brown rice (~400 kcal)
The NHS recommends tracking what you eat for a few days to understand your baseline. Our free progress tracker helps monitor both meals and weight over time. Consistency matters more than perfection — choosing good lunches most days creates the sustainable calorie deficit needed for gradual weight loss, typically 0.5–1 kg per week.
- 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 calories should a weight loss lunch contain?
For most UK adults, a weight loss lunch should contain 400–600 kcal, depending on your total daily target. A typical deficit for weight loss is around 500 kcal per day, which usually results in losing 0.5 kg per week. Your GP or a healthcare professional can advise on your personal calorie target based on your height, weight, and activity level.
What's the difference between a good weight loss lunch and just eating less?
Eating less without balancing nutrients leaves you hungry and fatigued. A good weight loss lunch includes adequate protein, fibre, and healthy fats, which keep you satisfied despite eating fewer calories. This approach is more sustainable long-term than simple calorie restriction and protects muscle mass during weight loss.
Can I eat the same lunch every day for weight loss?
Yes, meal repetition is an effective strategy and saves time and decision-making. However, varying your lunches slightly helps ensure you get different nutrients. If you eat the same lunch daily, include different vegetables, proteins, or whole grains across the week to maintain nutritional balance.
Do weight loss lunches work if I'm taking prescription weight loss medication?
Yes. Prescription weight loss treatments like GLP-1 medications support weight loss by reducing appetite and cravings, but they work best alongside healthy eating habits. A good weight loss lunch supports this by providing proper nutrition when your appetite is naturally reduced, helping you maintain energy and health.
How does lunch fit into a weight management plan with GLP-1 medication?
If you're taking medication for weight management, a balanced lunch helps prevent nutrient deficiencies and maintains energy. Many people on GLP-1 treatment find smaller portions feel satisfying due to how the medication works. A nutritious lunch — even if smaller than before — supports sustainable weight loss and overall health.
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.