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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Low Calorie Lunches for Weight Loss
A calorie deficit is essential for weight loss, and lunch is a perfect opportunity to support your goals. The NHS recommends losing weight at a sustainable rate of 0.5 to 1 kg per week, which typically requires a daily calorie deficit of around 500 kcal. Low calorie lunches don't mean restrictive or bland meals — they're about choosing nutrient-dense foods that keep you satisfied whilst supporting your weight management in the UK. This guide covers practical lunch ideas, portion control, and how to track progress alongside other weight loss approaches.
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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.
Practical Low Calorie Lunch Ideas and Portion Control
Balanced low calorie lunches combine lean protein, vegetables, and healthy fats to keep you feeling full without excess calories. Aim for 400–600 kcal at lunch for most adults, depending on your overall daily target and activity level. Popular low calorie lunch options include:
- Grilled chicken breast with roasted vegetables and brown rice — approximately 450 kcal, high in protein and fibre
- Salmon salad with mixed leaves, olive oil dressing, and chickpeas — approximately 420 kcal, provides omega-3 fats and sustained energy
- Turkey and vegetable soup — approximately 300 kcal, naturally filling and hydrating
- Lentil-based curry with cauliflower rice — approximately 380 kcal, plant-based protein alternative
- Tuna sandwich on wholemeal bread with lettuce and tomato — approximately 400 kcal, portable and balanced
The key is prioritising protein (which supports satiety and muscle preservation during weight loss) and vegetables (which are calorie-light but nutrient-dense). Avoid sugary dressings and fried preparations — instead use olive oil, lemon juice, or vinegar-based dressings. If you're following weight loss medication uk approaches such as GLP-1 weight loss injections alongside dietary changes, smaller portions may feel naturally adequate as these medications reduce appetite.
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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.
Tracking Your Lunch Calories and Weight Management
Consistent calorie awareness is crucial for sustainable weight loss. Use a food tracking app to log your lunches and identify patterns — many people discover they're underestimating portion sizes or hidden calories in dressings and cooking oils. If your BMI indicates you'd benefit from weight loss support, calculate your personal BMI using our free BMI calculator to understand your health baseline and set realistic targets.
Remember that nhs weight loss guidance emphasizes dietary change alongside increased physical activity — lunch is just one meal. Our free progress tracker helps you log weight changes over time and stay motivated. If considering prescription weight loss medication, your GP can assess eligibility based on your BMI and health profile. Sustainable weight loss combines nutrition, movement, and sometimes medical support depending on individual circumstances.
- 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 low calorie lunch contain?
For most UK adults aiming for weight loss, a lunch of 400–600 kcal is appropriate, depending on your daily target and activity level. The NHS recommends a calorie deficit of around 500 kcal per day for 0.5 kg weekly loss. If you're unsure about your personal target, your GP or a registered dietitian can advise based on your BMI and health goals.
Can I eat low calorie lunches if I'm taking GLP-1 weight loss medication?
Yes. Low calorie lunches work alongside GLP-1 medications like Wegovy or Mounjaro, which reduce appetite naturally. Many people find smaller portions feel adequate when taking these medications. Always combine medication with balanced nutrition — don't restrict calories excessively. Your prescriber can provide personalised guidance.
What's the difference between low calorie and very low calorie diets?
Low calorie diets are typically 1200–1500 kcal per day and can be followed long-term. Very low calorie diets (under 800 kcal per day) should only be undertaken under medical supervision, as they risk nutrient deficiencies and muscle loss. The NHS recommends sustainable, moderate calorie reduction for most people.
Are low calorie lunches suitable for long-term weight management?
Yes, if you focus on nutritionally balanced meals rather than restriction. The goal is building sustainable eating habits you can maintain. Combine low calorie lunches with regular activity and use our free progress tracker to monitor results. If weight loss plateaus, your GP can discuss additional support options, including prescription weight loss medication if eligible.
How does lunch fit into overall weight loss strategy?
Lunch is one of three main meals and typically accounts for 25–35% of daily calories. Consistent, balanced lunches prevent mid-afternoon hunger and overeating later. Use our GLP-1 weight loss calculator if exploring medication options, and our BMI calculator to track your health metrics alongside dietary changes for comprehensive weight management support.
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.