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
Do Juices Help With Weight Loss?
Juices can be part of a weight management strategy, but they're not a clinically supported solution on their own. While some juices contain vitamins and nutrients, most are high in natural sugars and calories — often providing little satiety. The NHS recommends whole fruits over juices because they contain fibre, which helps you feel fuller for longer. If you're exploring weight loss options, understanding how different foods and drinks fit into a calorie deficit is essential. Combined with physical activity and sustainable dietary changes, even modest weight loss of 5–10% can improve your health significantly.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Juices Affect Weight Loss
Most commercial juices are high in sugar and calories despite being marketed as healthy. A 250ml glass of orange juice contains around 110 calories and 24g of sugar — equivalent to eating three whole oranges without the fibre. Your body processes liquid calories differently than solid food; juice doesn't trigger the same satiety signals, so you may consume excess calories without feeling full.
The NHS weight loss guidance emphasises that sustainable weight management requires a calorie deficit of around 500 kcal per day to lose approximately 0.5 kg per week. Replacing sugary juices with water, herbal tea, or whole fruits is more effective. If you enjoy juice, dilute it with water (50/50 ratio) to reduce calorie and sugar content. Fresh vegetable juices like celery or cucumber juice are lower in calories (around 30–50 kcal per 250ml), though they still lack the fibre of whole vegetables. When exploring weight management options — whether through diet, exercise, or prescription weight loss medication — professional guidance is essential for your individual circumstances.
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.
Effective Weight Loss Strategies Beyond Juices
For sustained weight loss in the UK, the NHS recommends a balanced approach combining reduced-calorie eating, increased physical activity, and behaviour change support. Prescription weight loss medications like GLP-1 injections are available for eligible adults with a BMI of 30 or above (or 27+ with weight-related health conditions), and they work alongside lifestyle changes — not instead of them. These medications may help reduce appetite and support feeling fuller after smaller meals, making calorie reduction more manageable. Our free GLP-1 weight loss calculator can help you understand potential outcomes if you're considering prescription options. For immediate, practical steps: replace sugary drinks with water or unsweetened tea, eat whole fruits instead of juices, and aim for consistent, moderate activity. Your GP can refer you to local weight management services or discuss whether prescription options are appropriate for you.
- 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 fresh juices better than processed juices for weight loss?
Fresh juices still contain high natural sugar content and lack the fibre of whole fruits. A 250ml glass of fresh apple juice contains around 110 calories and 26g of sugar. Both fresh and processed juices provide similar calorie counts. Whole fruits are always preferable because the fibre content helps you feel fuller longer, making them more supportive for weight management.
Can vegetable juices help with weight loss?
Low-calorie vegetable juices like cucumber or celery (30–50 kcal per 250ml) are better than fruit juices, but whole vegetables are still more effective because they retain fibre. If you enjoy vegetable juice, dilute it with water to reduce calorie density. However, eating whole vegetables provides better satiety and nutritional value for weight loss.
What's the best approach to weight loss if diet alone isn't working?
The NHS recommends a tiered approach: start with self-help tools and lifestyle changes, then progress to structured weight management programmes through your GP. For eligible adults (BMI 30+), prescription weight loss injections may be considered through specialist services. Use our free BMI calculator to check your starting point, and speak with your GP about local weight management options.
How many calories should I aim for to lose weight safely?
The NHS recommends losing 0.5–1 kg per week, which typically requires a calorie deficit of around 500 kcal daily. Safe, sustainable weight loss is better than rapid loss. Your GP or a registered dietitian can advise on an appropriate calorie target based on your individual health and circumstances.
Are weight loss injections like Wegovy an alternative to diet and exercise?
Weight loss injections (GLP-1 medications like Wegovy) are prescription-only and work alongside diet and exercise changes, not instead of them. They may help reduce appetite and support feeling fuller, making calorie reduction more manageable. Clinical trials showed average weight loss of around 15% with Wegovy — but individual results vary, and a prescriber will assess suitability for you.
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.