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
Is Protein Powder Good For Weight Loss?
Protein powder can be a useful tool for weight loss when used alongside a reduced-calorie diet and increased physical activity. High-protein foods and supplements help you feel fuller for longer, preserve muscle mass during weight loss, and support metabolic function. However, protein powder alone won't cause weight loss — it works best as part of a balanced approach to weight management UK that includes dietary changes and lifestyle adjustments. Your GP or a registered dietitian can advise whether protein supplementation fits your personal weight loss plan.
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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 plays several key roles in weight management:
- Satiety: Protein keeps you feeling full longer than carbohydrates or fats, reducing overall calorie intake and food cravings
- Thermic effect: Your body uses more energy digesting protein (~20–30% of protein calories burned during digestion) compared to other macronutrients
- Muscle preservation: During weight loss, adequate protein intake helps preserve lean muscle mass, which protects your metabolic rate
- Blood sugar stability: Protein slows carbohydrate absorption, helping maintain steady energy levels and reducing appetite spikes
NHS weight loss guidance recommends including protein-rich foods at each meal. Protein powder can help meet daily targets (typically 1.2–1.6 grams per kg of body weight for those actively losing weight), especially if whole-food sources are limited.
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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 Powder and Calorie Deficit
Weight loss fundamentally requires a calorie deficit — consuming fewer calories than you burn. Protein powder itself doesn't create this deficit; it's simply a convenient way to increase protein intake. A typical protein shake (20–30g protein) contains 100–150 kcal, depending on the type (whey isolate is lower-calorie than concentrated whey). For effective nhs weight loss, most people aim for a deficit of 500 kcal daily, resulting in approximately 0.5 kg per week loss. Use our free weight converter and BMI calculator to understand your current weight and healthy weight range, then work with your GP or a dietitian to plan your calorie intake and macronutrient targets.
- 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.
Is protein powder better than whole-food protein for weight loss?
Not necessarily. Whole foods like chicken, eggs, fish, and Greek yoghurt offer additional nutrients and often promote satiety better due to their texture and fibre content. Protein powder is convenient and cost-effective, but works best as a supplement to whole foods, not a replacement. Both approaches support weight loss when part of a calorie deficit.
Can protein powder alone help me lose weight?
No. Protein powder alone won't cause weight loss without a calorie deficit and physical activity. It's a tool that helps you feel fuller and preserve muscle during weight loss, but sustainable results require dietary changes and lifestyle adjustments alongside any supplementation.
How much protein powder should I drink daily for weight loss?
This depends on your total daily protein target, body weight, and activity level. A registered dietitian or your GP can advise your personal needs. Generally, 1.2–1.6 grams of protein per kg of body weight daily supports weight loss while preserving muscle. Calculate your healthy weight range using our free BMI calculator to set appropriate targets.
Does protein powder affect prescription weight loss medication like GLP-1 injections?
Protein powder doesn't directly interact with Mounjaro or Wegovy. However, GLP-1 medications slow gastric emptying, so very high-protein or high-volume shakes may cause nausea or discomfort. Start with smaller portions and monitor your tolerance. Always discuss supplements with the prescriber managing your weight loss medication.
What type of protein powder is best for weight loss?
Whey protein isolate (minimal carbs and fats, 20–25g protein per serving) and casein (slow-digesting, promotes satiety) are popular choices. Plant-based options like pea or soya protein also work well. Choose unsweetened or naturally sweetened versions to keep calories low. Your dietitian can recommend the best option based on your preferences, allergies, and dietary goals.
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.