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 With Weight Loss?
Yes, evidence suggests that a high protein diet may help with weight loss by increasing satiety, boosting metabolism, and preserving muscle mass during weight loss. However, protein alone won't lead to weight loss without a calorie deficit. The NHS emphasises that sustainable weight management in the UK requires both dietary changes and increased physical activity. Protein can be a valuable tool as part of a balanced approach, particularly when combined with lifestyle changes or prescription weight loss medication under clinical guidance.
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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 you feel fuller for longer after eating. This can naturally reduce overall calorie intake without strict calorie counting.
Boosts metabolic rate: Protein has a higher thermic effect than other macronutrients — your body burns more calories digesting protein. This process, called diet-induced thermogenesis, may increase daily energy expenditure by 10–30%.
Preserves muscle during weight loss: When losing weight, muscle loss is a concern. Adequate protein intake helps preserve lean muscle mass, which is important for maintaining a healthy metabolic rate and mobility.
- Recommended protein intake: 1.2–2.0g per kilogram of body weight daily
- High protein foods: chicken, fish, eggs, Greek yoghurt, legumes, tofu
- Works best with a calorie deficit — protein alone doesn't clinically studied weight loss
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.
Protein Within A Wider Weight Loss Strategy
High protein diets are most effective as part of a comprehensive weight loss plan. The NHS recommends losing weight at a rate of 0.5–1 kg per week through a combination of dietary changes and increased physical activity. Use our free BMI calculator to establish your current weight status, then set realistic goals.
For some people, prescription weight loss medication may be appropriate alongside dietary changes. GLP-1 medications like Mounjaro (tirzepatide) and Wegovy (semaglutide) work by increasing satiety — similar to how protein works — but through a different mechanism. Try our GLP-1 weight loss calculator to explore potential outcomes if medication is relevant for you. Whether using medication or lifestyle changes alone, adequate protein intake supports better results.
- 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 should I eat daily for weight loss?
The NHS and clinical guidance suggest 1.2–2.0g of protein per kilogram of body weight. For a 70kg person, this means 84–140g daily. Individual needs vary based on activity level, age, and muscle mass. Your GP can provide personalised guidance.
Does high protein diet work without calorie deficit?
No. Protein supports weight loss by increasing satiety and metabolism, but weight loss ultimately requires a calorie deficit. You must consume fewer calories than you burn. High protein is a tool to make that deficit easier to maintain, not a replacement for it.
Can high protein damage kidneys?
For people with healthy kidneys, high protein intake is safe. The myth of protein damaging kidneys is not supported by evidence in healthy individuals. However, if you have kidney disease, always consult your GP before increasing protein significantly.
Is high protein diet compatible with weight loss medication?
Yes. High protein diets work well alongside prescription weight loss medications like Mounjaro and Wegovy. Both approaches increase satiety, and together they may support better results. Always follow your prescriber's dietary guidance.
What's the best high protein food for weight loss?
Lean proteins are ideal: chicken breast, white fish, eggs, Greek yoghurt, cottage cheese, legumes, and tofu. Choose foods low in saturated fat and added sugars. Combine protein with vegetables and wholegrain carbohydrates for balanced, sustainable weight loss.
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.