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
Does A High Protein Diet Help Weight Loss?
Yes, evidence suggests that eating more protein can support weight loss when combined with a reduced-calorie diet. Protein helps you feel fuller for longer, may preserve muscle during weight loss, and requires more energy to digest than other nutrients. In the UK, the NHS recommends balancing protein intake with other food groups as part of sustainable weight management. However, protein alone won't lead to weight loss — you still need a calorie deficit. Our free BMI calculator can help you understand your current weight health status, while our GLP-1 weight loss calculator shows how lifestyle changes and medical support might work together.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
How Protein Supports Weight Loss
Protein increases satiety. Protein is more satiating than carbohydrates or fat, meaning it keeps you feeling full longer. This naturally reduces calorie intake without conscious restriction. Studies show people eating higher protein diets consume fewer calories overall.
Protein preserves muscle mass. During weight loss, your body can lose both fat and muscle. Higher protein intake (around 1.6–2.2g per kg of body weight daily) helps preserve lean muscle tissue, which is important for maintaining metabolism and strength.
Protein has a higher thermic effect. Your body burns more calories digesting protein than carbohydrates or fat — approximately 20–30% of protein calories versus 5–10% for carbs. Over time, this contributes to a greater calorie deficit.
- Aim for protein at every meal and snack
- Good UK sources: chicken, fish, eggs, Greek yoghurt, beans, lentils, tofu
- Combine protein with whole grains and vegetables for balanced nutrition
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.
High Protein Diet in Weight Management Programmes
The NHS supports moderate protein intake as part of balanced weight management. For sustainable weight loss in the UK, the recommendation remains a calorie deficit of around 500 kcal daily, targeting 0.5–1 kg per week loss. High protein diets work best alongside physical activity and behaviour change.
For individuals using prescription weight loss medication through NHS weight management services or private prescribing, protein-rich foods are particularly helpful — they work synergistically with GLP-1 or GIP/GLP-1 medications to support fullness and reduce cravings. Track your weight loss progress with our free progress tracker while adjusting your diet. Always consult your GP before starting any significant dietary change, especially if you have kidney disease or take certain medications.
- 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 much protein do I need daily for weight loss?
The NHS suggests 0.8g protein per kg of body weight as a baseline. For weight loss with exercise, aim for 1.6–2.2g per kg daily. For example, a person weighing 70kg should target 112–154g daily. Spread protein across meals (25–40g per meal) for best satiety. Your GP can advise on your personal protein needs.
Is a high protein diet safe long-term?
Yes, for most healthy adults. Higher protein diets are safe and supported by evidence for weight loss. However, people with kidney disease or certain medical conditions should consult their GP before increasing protein significantly. Ensure you drink adequate water and eat a balanced diet with plenty of vegetables and whole grains.
Can protein alone help me lose weight without calorie restriction?
Protein helps by increasing fullness, which naturally reduces calories. However, weight loss fundamentally requires a calorie deficit. Protein supports this by making it easier to eat fewer calories, but you still need overall calorie reduction. Use our free BMI calculator to establish your current baseline, then work with your GP on a sustainable deficit.
Does high protein diet work with weight loss injections like Mounjaro or Wegovy?
Yes. High protein intake works well alongside GLP-1 medications (Wegovy, Saxenda) or dual GIP/GLP-1 medications (Mounjaro). Both support feeling fuller on smaller portions. Protein-rich foods prevent muscle loss during weight loss. Clinical trials show best results when medication is combined with healthy eating and activity. Consult your prescriber for personalised guidance.
What are the best protein sources for UK weight loss diets?
Lean chicken, fish, eggs, Greek yoghurt, cottage cheese, beans, lentils, and tofu are all excellent UK options. Plant-based proteins like beans and lentils also provide fibre, supporting digestive health. Vary your sources to get different nutrients. Our weight loss resources cover balanced meal planning approaches aligned with NHS guidance.
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.