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
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Best Protein Powder for Women Weight Loss
Protein powder can be a useful addition to a weight loss plan for women, helping you feel fuller for longer and preserve muscle mass during weight loss. Combined with a reduced-calorie diet, regular physical activity, and — if appropriate — prescription weight loss medication, protein supports sustainable results. This guide covers what to look for in a protein powder and how it fits into an effective weight management strategy in the UK.
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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.
What Makes a Good Protein Powder for Weight Loss
When choosing a protein powder for weight loss, look for products that are high in protein (at least 20g per serving), low in added sugar (under 5g per serving), and relatively low in calories per scoop (ideally 100–150 kcal). Whey protein isolate is popular because it absorbs quickly and has minimal fat and lactose. Plant-based options like pea, rice, or hemp protein work well if you're vegan or lactose-intolerant, though they often contain slightly less complete amino acid profiles. Avoid products with artificial sweeteners if you prefer natural options, though most weight loss-focused powders use these for lower calorie counts. Check the nutritional label carefully — some "diet" powders are still surprisingly high in sugar. The best choice depends on your taste preferences, dietary requirements, and budget. Brands available in the UK include MyProtein, Optimum Nutrition, and Bulk powders, among many others.
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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.
How Protein Supports Weight Loss
Protein has several advantages for weight loss. First, it has a higher thermic effect than carbohydrates — your body burns more calories digesting protein, which boosts your metabolism slightly. Second, protein helps you feel fuller for longer, reducing overall calorie intake without feeling hungry. Third, during weight loss, adequate protein intake (around 1.6–2.2g per kg of body weight daily) helps preserve muscle mass, which means more of your weight loss comes from fat rather than muscle. You can calculate your personal needs using your current weight — if you weigh 70kg, aim for 110–150g of protein daily. Protein powder makes it easier to hit these targets conveniently. However, protein alone won't cause weight loss; you still need a calorie deficit. Use our free BMI calculator to establish your baseline health metrics, then track your progress with our progress tracker as you combine dietary changes with increased physical activity.
- 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 necessary for weight loss?
No, it's optional. Weight loss requires a calorie deficit, which you can achieve through whole foods alone. Protein powder is simply a convenient way to increase protein intake, help you feel fuller, and preserve muscle during weight loss. It's most useful if you struggle to eat enough protein through regular food.
How much protein powder should I use daily for weight loss?
There's no fixed amount — it depends on your total daily protein target. Most women aiming for weight loss should aim for 100–130g of protein daily. If you eat 60g from food, supplement with one to two protein powder servings (20–40g). Use our BMI calculator to check your baseline, then adjust protein intake based on your goals and activity level.
Can protein powder alone help me lose weight?
No. Protein powder is only effective within a calorie deficit. You still need to reduce overall calorie intake and increase physical activity. Think of protein as a tool that makes the process easier by helping you feel fuller and preserving muscle, not a weight loss solution by itself.
Is whey protein better than plant-based protein for weight loss?
Both work for weight loss if they fit your calorie goals. Whey protein has a complete amino acid profile and absorbs quickly, while plant-based proteins are suitable for vegans and those with lactose intolerance. Choose based on your dietary preferences and how your body tolerates each type.
Should I use protein powder if I'm taking Wegovy or other weight loss medication?
Yes, protein powder can be helpful alongside prescription weight loss medication like Wegovy (semaglutide) or GLP-1 injections. These medications reduce appetite, making it harder to eat enough protein — powder makes this easier. Maintain adequate protein intake to preserve muscle mass during weight loss, and always follow your prescriber's advice on diet and nutrition alongside any medication.
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.