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
What Is The Best Protein Drink For Weight Loss?
Protein drinks can be a useful tool for weight loss when chosen carefully, but there's no single "best" option — the right choice depends on your goals, calorie budget, and lifestyle. In the UK, effective weight management typically combines a reduced-calorie diet with increased physical activity. Protein plays an important role because it helps you feel fuller for longer, supports muscle maintenance during weight loss, and has a higher thermic effect than other nutrients. Our free weight loss calculator can help you understand your personal calorie needs and potential weight loss with lifestyle changes or prescription medication options.
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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 Protein Drink Good For Weight Loss?
The best protein drinks for weight loss share several key features. Low calorie content is essential — most effective options contain 100–200 kcal per serving. Look for drinks with at least 15–25g of protein per serving, which maximises satiety and supports muscle preservation. Choose drinks with minimal added sugar — aim for under 5g per serving, as excess sugar adds empty calories without nutritional benefit.
- Whey protein isolate (higher protein, lower carbs and fat)
- Casein protein (slower-digesting, keeps you fuller longer)
- Plant-based options like pea or soy protein (good for vegan/vegetarian approaches)
- Drinks with added fibre (improves satiety and digestive health)
Check the ingredient list for artificial sweeteners you're comfortable with — sucralose, aspartame, and stevia are all used. Avoid drinks with added fats or high saturated fat content. Protein drinks work best as part of a structured eating plan, not as a meal replacement unless specifically designed as such.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 And Nhs Guidance
Protein supports weight loss in three main ways: it increases satiety (feeling full), boosts metabolic rate slightly (thermic effect), and helps preserve muscle mass during calorie restriction. The NHS recommends a balanced approach combining reduced-calorie diet with increased physical activity. Effective weight management UK guidelines suggest losing 0.5–1 kg per week as sustainable. Protein drinks can help achieve this by reducing overall calorie intake while maintaining adequate nutrition.
For people exploring more intensive weight loss support, prescription weight loss medication is now available through NHS weight management services or private prescribing. These medications like GLP-1 injections work alongside diet and exercise changes. Use our free GLP-1 weight loss calculator to explore how prescription options might support your specific goals, or our BMI calculator to assess your current weight status and personalised healthy weight range.
- 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.
What's the difference between whey isolate and whey concentrate protein drinks?
Whey isolate contains more protein (90%+) and fewer carbs and fats, making it better for calorie-conscious weight loss. Whey concentrate is less processed, slightly higher in calories but may retain more nutrients. For weight loss specifically, isolate is the better choice — typically 110–130 kcal per serving versus 130–150 kcal for concentrate.
Can protein drinks replace meals during weight loss?
Protein drinks can replace one meal occasionally, but regular meal replacement isn't ideal for sustainable weight loss. Whole foods provide fibre, micronutrients, and satiety that drinks don't fully replicate. Use protein drinks as a snack or breakfast addition rather than meal replacement. Always discuss significant dietary changes with your GP.
Are meal replacement shakes better than regular protein drinks for weight loss?
Meal replacement shakes are specifically formulated to replace meals and contain additional vitamins and minerals. For weight loss, they can work well if they're genuinely low-calorie (usually 200–250 kcal) and high in protein (25–30g). However, regular high-protein drinks are often more flexible and cheaper. Both work — choose what fits your routine and budget.
How many protein drinks per day is safe for weight loss?
One to two protein drinks daily as part of a balanced diet is generally safe. Exceeding this may displace whole foods and fibre. Excessive protein intake (above 2g per kg body weight) offers no additional weight loss benefit and may stress kidneys in vulnerable people. Check with your GP if you have kidney disease before increasing protein significantly.
Do protein drinks work better for weight loss than medication like Mounjaro or Wegovy?
Protein drinks support weight loss through diet; prescription medications work through appetite regulation. They're complementary, not competing. Clinical trials show GLP-1 medications like Wegovy average clinically studied weight loss. Protein drinks support this by helping you stick to a reduced-calorie diet. Many people use both together for best results — discuss with your prescriber.
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.