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
Best Protein Powder for Weight Loss and Muscle Growth
Protein powder is a practical tool for supporting weight loss and muscle growth when combined with a balanced diet and exercise. Choosing the right protein powder can help you maintain muscle mass during weight loss, stay fuller for longer, and meet your daily protein targets. This guide explains how protein supports weight management in the UK and what to look for when selecting a powder that fits your health goals.
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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 and Muscle Maintenance
Protein plays a crucial role in weight management and muscle preservation. When losing weight, adequate protein intake helps protect lean muscle mass, which would otherwise be lost alongside fat. Protein also has a higher thermic effect than carbohydrates or fat, meaning your body uses more energy digesting it — this supports a calorie deficit for NHS weight loss goals. Additionally, protein-rich foods and shakes help you feel fuller for longer, reducing hunger and supporting adherence to a reduced-calorie diet.
- Muscle preservation: Protein helps maintain lean mass during weight loss, keeping your metabolism active
- Satiety: Protein increases feelings of fullness, reducing overall calorie intake
- Thermic effect: Your body burns more calories digesting protein than other macronutrients
- Recovery: Protein supports muscle repair after exercise, essential for building strength alongside weight loss
Most adults aiming for weight loss should aim for approximately 1.6–2.2g of protein per kg of body weight daily, according to sports nutrition research. Protein powder offers a convenient, low-calorie way to reach these targets.
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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.
Choosing the Right Protein Powder for Your Goals
When selecting a protein powder, consider the following factors:
- Protein content: Aim for at least 20g protein per serving
- Calorie count: Whey protein isolate typically contains fewer calories than concentrates
- Added sugars: Choose powders with minimal added sugar to support weight loss goals
- Ingredients: Look for simple, recognisable ingredients without excessive additives
- Mixability: Select a powder that mixes well without lumps for easier consistency
Whey protein isolate is often recommended for weight management because it contains more protein and fewer carbohydrates per serving. Vegan alternatives like pea, hemp, or brown rice protein are effective too — choose based on dietary preferences and digestive tolerance. Track your overall calorie intake using our free progress tracker alongside any protein supplementation to ensure you're maintaining a sustainable calorie deficit for weight loss.
- 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.
Can protein powder alone help me lose weight?
Protein powder is a useful tool but not a solution by itself. Weight loss requires a calorie deficit, regular physical activity, and balanced nutrition. Protein powder helps you meet protein targets and feel fuller, but without overall calorie control and exercise, weight loss won't occur. Use it alongside a healthy diet, not as a replacement for whole foods.
How much protein powder should I consume daily?
This depends on your body weight, activity level, and total calorie intake. Most adults aiming for weight loss benefit from 1.6–2.2g protein per kg of body weight daily. If you weigh 70kg, that's approximately 112–154g protein per day from all sources. One or two protein shakes can help bridge the gap between whole foods and your daily target.
Is whey protein isolate better than whey concentrate for weight loss?
Whey isolate typically contains more protein and fewer carbohydrates and calories per serving, making it slightly more efficient for weight management. However, whey concentrate is still a good choice and often more affordable. The difference is modest — consistency with your overall diet and exercise matters far more than this distinction.
Can I use protein powder if I'm taking GLP-1 weight loss medication?
Yes, protein powder can be helpful alongside GLP-1 medication like Wegovy. GLP-1 injections support appetite reduction, but you still need adequate protein to preserve muscle during weight loss. Protein shakes are often easier to tolerate than solid foods if you experience nausea. Always discuss any supplements with your GP or prescriber.
What's the best time to drink protein powder for weight loss?
Timing is less important than total daily protein intake. However, many people find protein shakes helpful after exercise for muscle recovery, or as a filling breakfast or snack to prevent overeating later. Experiment to find what works for your routine and appetite. Use our BMI calculator to track progress and adjust your approach based on results over time.
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.