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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Meal Supplement For Weight Loss — What Works In The UK
A meal supplement for weight loss is a drink, shake, or bar designed to replace or supplement meals while reducing calorie intake. In the UK, meal supplements range from over-the-counter nutrition drinks to prescription weight management options. Some people use them alongside lifestyle changes, whilst others combine them with prescription weight loss medication. This guide explains how meal supplements work, what evidence shows, and how they fit into a broader weight management approach in the NHS context.
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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 Meal Supplements Support Weight Loss
Meal supplements work by providing controlled calories, protein, and nutrients in a convenient format, helping you create and maintain a calorie deficit — the foundation of weight loss. Many UK meal supplements are formulated with higher protein content to help preserve muscle mass during weight loss, reduce hunger between meals, and support satiety (feeling full). Popular options include branded meal replacement shakes, ready-to-drink nutrition drinks, and high-protein bars. The NHS supports meal supplements as part of a structured weight management plan, particularly for people with a BMI of 30 or above seeking to lose weight. Evidence suggests meal supplements can help achieve modest weight loss when used consistently alongside physical activity. However, they work best as a temporary tool rather than a long-term replacement for regular balanced meals — sustainable weight loss requires developing healthy eating habits. Our free BMI calculator can help you determine your current weight category and whether weight loss may benefit your health.
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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.
Meal Supplements vs Prescription Weight Loss Options
Meal supplements alone achieve modest weight loss for most people, typically 5–10% of body weight over several months. If you're seeking more significant weight loss support, prescription weight loss medication is another option available in the UK. GLP-1 weight loss injections like Wegovy (semaglutide) and Mounjaro (tirzepatide) are prescription-only medicines licensed for adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. Clinical trials showed these medications help achieve average weight loss of 15–21% of body weight. Many people combine meal supplements with prescription weight loss medication for enhanced results. Access to prescription weight loss treatment is through NHS specialist services or private online prescribing following clinical assessment. Our GLP-1 weight loss calculator can help you explore potential outcomes with these medications.
- 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.
Are meal supplements effective for weight loss?
Meal supplements can support weight loss when used as part of a calorie-controlled plan. Evidence shows modest weight loss of 5–10% of body weight is achievable. Success depends on consistent use, maintaining a calorie deficit, and combining supplements with healthy eating habits and physical activity. Individual results vary significantly.
What's the difference between a meal supplement and meal replacement?
A meal supplement adds extra nutrition between meals or reduces portion sizes at mealtimes. A meal replacement fully replaces one or more meals. Both can support weight loss by reducing total calorie intake. Meal replacements tend to create a larger calorie deficit but are harder to sustain long-term.
Can I use meal supplements alongside GLP-1 weight loss medication?
Yes, many people use meal supplements alongside prescription weight loss medication like Wegovy or Mounjaro. Some find supplements help manage appetite between doses, whilst others use them to simplify meal planning. Always discuss your full eating plan with your prescriber to ensure it's safe and aligned with your medication.
How long should I use meal supplements for weight loss?
Meal supplements are most effective as a short to medium-term tool (3–6 months), not a permanent replacement for real food. The NHS recommends using them whilst you develop sustainable healthy eating habits. Once you've established regular eating patterns, transitioning back to whole foods helps maintain long-term weight loss.
Where can I get meal supplements in the UK?
Meal supplements are widely available in UK supermarkets, pharmacies, health shops, and online retailers. No prescription is needed for over-the-counter options. Always check the nutrition label, choose options lower in added sugars, and ideally select those high in protein and fibre to support satiety and muscle retention.
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.