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 Breakfast Ideas For Weight Loss
A healthy low calorie breakfast can help support weight loss by controlling hunger throughout the morning and reducing overall daily calorie intake. The NHS recommends starting your day with balanced nutrition — combining protein, fibre, and complex carbohydrates — rather than skipping breakfast entirely. A typical low calorie breakfast contains 250–350 kcal and helps stabilise blood sugar, which may reduce cravings later in the day. Combined with lifestyle changes and, if appropriate, prescription weight loss medication, breakfast choices play an important role in sustainable weight management for UK adults.
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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.
Best Low Calorie Breakfast Options
Protein-rich breakfasts are particularly effective for weight loss because protein increases satiety and supports muscle preservation during weight loss. Aim for 20–25g of protein at breakfast.
- Scrambled eggs (2–3 eggs) with wholemeal toast: ~200 kcal, high protein
- Greek yoghurt (150g) with berries and granola (1 tbsp): ~180 kcal
- Cottage cheese (100g) with sliced tomatoes and black pepper: ~100 kcal
- Smoked salmon (50g) with cream cheese (1 tbsp) on wholemeal toast: ~220 kcal
High fibre options improve digestive health and sustain appetite control. Oatmeal (40g dry) with skimmed milk, cinnamon, and berries reaches approximately 180 kcal. Whole grain cereals paired with unsweetened almond milk provide filling breakfasts under 200 kcal. Avoid sugary cereals and sweetened yoghurts — these spike blood sugar and increase hunger within hours. When managing weight in the UK, checking food labels for hidden sugars is essential, as many "low fat" products contain added sugars to improve taste.
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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.
Breakfast and Sustainable Weight Loss
For effective weight management in the UK, the NHS advises that breakfast should contribute approximately 20–25% of your daily calorie intake. If you're following a reduced-calorie diet (typically 1,500–1,800 kcal daily for weight loss), this means breakfast should be 300–450 kcal. Skipping breakfast often leads to overeating later; research shows breakfast eaters tend to make healthier food choices throughout the day.
If you're exploring prescription weight loss options — such as GLP-1 weight loss medication like Mounjaro or Wegovy — breakfast becomes even more important. These medications may reduce appetite, so eating smaller, nutrient-dense meals helps prevent nutritional deficiencies. Use our free BMI calculator above to assess your current weight status, and consider our GLP-1 weight loss calculator to explore potential outcomes with prescription medication alongside dietary changes.
- 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.
What's a realistic low calorie breakfast for weight loss?
A realistic low calorie breakfast contains 250–350 kcal and includes protein (eggs, yoghurt, fish), fibre (wholemeal toast, oats, vegetables), and healthy fats (olive oil, nuts). This combination keeps you full until mid-morning and prevents overeating later. Aim for at least 15g protein per breakfast meal.
Should I skip breakfast to lose weight faster?
No — skipping breakfast often backfires. Breakfast skippers typically consume more calories during the day due to increased hunger and poor food choices. The NHS recommends eating a balanced breakfast as part of sustainable weight loss. A 200–300 kcal breakfast is far better than skipping and then overeating lunch.
Are low calorie breakfast bars a good option for weight loss?
Many commercial breakfast bars contain hidden sugars and lack protein, so they don't provide lasting fullness. Check nutrition labels carefully — aim for bars with at least 10g protein and less than 5g sugar. Whole foods like eggs, oats, and yoghurt are usually better choices, though a good breakfast bar can work occasionally.
How does breakfast fit with weight loss medication like Mounjaro or Wegovy?
Prescription weight loss medications like Mounjaro (tirzepatide) and Wegovy (semaglutide) reduce appetite, so you may naturally eat smaller breakfasts. It's still important to eat nutrient-dense foods to prevent nutritional deficiencies. These medications are prescription-only and require clinical assessment by a licensed prescriber.
Can I drink coffee or tea on a low calorie breakfast plan?
Yes — black tea and black coffee contain almost zero calories. However, add-ons increase calories quickly: a small milk and one sugar adds ~25 kcal, whilst a latte with full-fat milk and syrup can reach 150+ kcal. To keep breakfast low calorie, use skimmed milk, unsweetened almond milk, or oat milk alternatives.
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.