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 High Protein Powder Help with Weight Loss?
High protein powder can be a useful tool for weight management when combined with a reduced-calorie diet and physical activity. Protein helps you feel fuller for longer, supports muscle maintenance during weight loss, and has a higher thermic effect than carbohydrates or fat — meaning your body uses more calories to digest it. However, protein powder alone won't lead to weight loss without a calorie deficit. In the UK, prescription weight loss medication combined with dietary changes offers additional support for those who meet eligibility criteria. Our free BMI calculator can help you understand where you currently sit on the NHS weight ranges.
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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.
How Protein Supports Weight Management
Protein plays several key roles in weight loss:
- Satiety: Protein is more satiating than carbohydrates or fat, helping you feel fuller after meals and reducing overall calorie intake
- Muscle preservation: During weight loss, adequate protein helps preserve lean muscle mass, which supports a healthy metabolic rate
- Thermic effect: Your body burns approximately 20–30% of protein calories during digestion, compared to 5–10% for carbohydrates and 0–3% for fat
- Blood sugar stability: Protein slows carbohydrate absorption, helping maintain steady blood sugar and reducing energy crashes
The NHS recommends 0.8g of protein per kilogram of body weight daily for most adults, though higher amounts (1.2–2g per kg) may support weight loss efforts. Use our free weight converter to calculate your weight in kilograms if needed. Protein powder — whether whey, plant-based, or collagen — can be a convenient way to meet these targets, especially when combined with whole food sources like chicken, fish, eggs, and legumes.
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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.
NHS Weight Loss and Prescription Options
While high protein intake supports weight management in the UK, it works best alongside a sustainable reduced-calorie diet and regular physical activity. The NHS recommends losing weight at a rate of 0.5–1 kg per week for sustainable results. For adults with a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure, prescription weight loss medication may be available through specialist NHS services or private prescribing. Medications like Mounjaro (tirzepatide) and Wegovy (semaglutide) are GLP-1 receptor agonists that may help reduce appetite and support weight loss alongside lifestyle changes. Individual results vary, and these are prescription-only medicines requiring clinical assessment. Our GLP-1 weight loss calculator can help you estimate potential outcomes if you're considering this option.
- 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 powder should I use for weight loss?
Most people aiming for weight loss benefit from 1.2–2g of protein per kilogram of body weight daily. This typically translates to one or two protein shakes alongside whole food protein sources. The exact amount depends on your current weight, activity level, and calorie target. Your GP or a registered dietitian can give you personalised guidance. Use our BMI calculator to understand your current weight category on NHS guidelines.
Can protein powder alone help me lose weight?
No — protein powder alone won't cause weight loss without a calorie deficit. Weight loss requires consuming fewer calories than you burn. Protein powder is a tool that can help you feel fuller and maintain muscle during weight loss, but it must be combined with a reduced-calorie diet and physical activity for results.
What type of protein powder is best for weight loss?
Whey, plant-based (pea, hemp, soy), and collagen protein powders are all effective for weight loss. The best choice depends on your dietary preferences, allergies, and digestion. Whey and plant-based options tend to be more satiating. Look for powders low in added sugar and high in protein per serving.
Is high protein safe for my kidneys?
For people with healthy kidneys, high protein intake (up to 2.2g per kg body weight) is generally safe according to UK research. However, if you have kidney disease, diabetes, or other health conditions, you should discuss protein intake with your GP before increasing consumption significantly.
Should I use protein powder if I'm taking prescription weight loss medication?
Yes — high protein intake supports weight loss whether you're using lifestyle changes alone or prescription medications like Mounjaro or Wegovy. In fact, adequate protein helps preserve muscle during weight loss. Always discuss any dietary changes with the prescriber managing your weight loss medication to ensure they align with your overall plan.
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.