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 support weight loss as part of a balanced approach, but it's not a standalone solution. In the UK, weight management works best when combining dietary changes — like adequate protein intake — with calorie control and physical activity. For adults who need additional support, prescription weight loss medications are also available through specialist NHS services or private prescribing. Our free GLP-1 weight loss calculator can help you explore whether medication might be suitable alongside other lifestyle changes, and our BMI calculator shows your current health status based on NHS guidelines.
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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 Powder Can Support Weight Loss
Protein powder may help with weight loss in several ways. Protein increases satiety — it keeps you feeling fuller for longer, which can reduce overall calorie intake. This is particularly useful when managing weight in the UK, where weight management guidance emphasises balanced nutrition. Protein also has a higher thermic effect than carbohydrates or fats, meaning your body uses more energy digesting it.
- Protein powder is convenient for post-workout nutrition
- It supports muscle preservation during calorie deficit
- It can help replace sugary snacks with protein-rich alternatives
- Typical servings contain 20–30g protein with minimal calories
However, protein powder alone won't create weight loss — you still need a calorie deficit. A balanced approach combines adequate protein, whole foods, hydration, and physical activity. For some adults, combining lifestyle changes with prescription weight loss medication offers additional support. The NHS offers tiered weight management services, with prescription options available for eligible adults.
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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.
Prescription Weight Loss Options Available in the UK
If dietary changes alone aren't sufficient, several prescription weight loss medications are licensed in the UK for eligible adults. Mounjaro (tirzepatide) and Wegovy (semaglutide) are once-weekly injections that work alongside reduced-calorie diet and exercise. Clinical trials showed average weight loss of 15–21% body weight with Mounjaro and approximately 15% with Wegovy — though individual results vary significantly.
Eligibility typically includes adults with a BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions. Access in the UK is through NHS specialist weight management services (with potential waiting lists) or private prescribing following a clinical assessment. Your GP can discuss which approach is appropriate for you. Use our free weight converter and BMI calculator to understand your current measurements and health status using NHS guidelines.
- 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 helpful tool but not a standalone solution. Weight loss requires a calorie deficit, which protein powder supports by increasing fullness. However, you'll also need to manage overall calorie intake, stay hydrated, and exercise regularly. For some people, prescription weight loss medication offers additional support alongside these lifestyle changes.
How much protein should I consume daily for weight loss?
The NHS generally recommends 0.8g per kg of body weight as a baseline, but during weight loss many people aim for 1.2–1.6g per kg to preserve muscle mass. Protein powder can help reach these targets conveniently. Your GP or a dietitian can give personalised guidance based on your health and goals.
What prescription weight loss options are available in the UK?
Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide) are licensed for weight management in UK adults meeting eligibility criteria. These are prescription-only medications available through NHS specialist services or private prescribing. Eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions.
How do I find out if I'm eligible for prescription weight loss treatment?
Contact your GP to discuss whether you meet the eligibility criteria. They can assess your BMI, health conditions, and current weight management efforts. If eligible, your GP can refer you to an NHS specialist weight management service, or you can pursue private prescribing through a UK-licensed prescriber. Use our free BMI calculator to understand your starting point.
Is prescription weight loss medication combined with protein powder effective?
Yes, prescription weight loss medications like Mounjaro and Wegovy work best when combined with dietary changes (including adequate protein) and physical activity. Protein powder fits well into this approach, supporting muscle preservation and satiety. However, medication requires a clinical assessment and prescription — discuss with your GP whether it's appropriate for your situation.
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.