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
Can Juicing Help You Lose Weight?
Juicing is often promoted as a quick weight loss solution, but the evidence is more nuanced than many health claims suggest. While fresh fruit and vegetable juices contain valuable vitamins and minerals, they're also high in natural sugars and low in fibre compared to whole fruits and vegetables. For sustainable weight management in the UK, NHS guidance recommends a balanced approach combining dietary changes with physical activity. Our free BMI calculator can help you understand your current weight status and set realistic goals.
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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.
The Truth About Juices and Weight Loss
Fresh juices contain concentrated sugars even without added sweeteners — a single glass of orange juice can contain 20–25g of sugar, equivalent to several whole oranges. When you remove the fibre by juicing, your body absorbs sugars more quickly, causing blood sugar spikes without the satiety benefit of whole fruit.
- Calorie content: A 250ml glass of juice typically contains 100–150 calories but provides minimal fullness, making it easy to exceed your daily intake
- Nutrient loss: Processing destroys some heat-sensitive vitamins and removes most fibre, which is crucial for digestive health and stable blood sugar
- Juice cleanses: Detox or "cleanse" juices lack evidence for weight loss and may cause energy crashes and muscle loss
For effective weight loss in the UK, the NHS recommends a calorie deficit of approximately 500 kcal per day, achieved through balanced meals, not liquid-only approaches. Whole fruits and vegetables are far more effective because they provide fibre, which slows sugar absorption and promotes satiety.
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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.
Better Alternatives for Sustainable Weight Loss
Instead of relying on juicing, evidence-based weight loss approaches include whole food diets rich in vegetables, lean proteins, and whole grains — combined with regular physical activity. A moderate calorie deficit of 500 kcal daily typically results in 0.5–1 kg weight loss per week.
For adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, prescription weight loss medications are available through the NHS or private prescribing. Options include GLP-1 injections, which work alongside dietary changes rather than replacing them. You can explore your BMI category using our free BMI calculator, and if you're considering medication options, our GLP-1 weight loss calculator can help you understand potential outcomes. Always consult your GP for personalised guidance on prescription weight loss medication and sustainable strategies tailored to your health.
- 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 fresh juice better for weight loss than smoothies?
Both contain high natural sugars, but smoothies retain fibre from whole fruit, making them slightly more satiating. However, neither is ideal for weight loss when consumed alone — they're best enjoyed in small portions alongside balanced meals rather than as meal replacements.
Can I lose weight by replacing meals with juice?
No. Juice-only diets lack protein and fibre, leading to muscle loss, energy crashes, and weight regain. The NHS recommends sustainable dietary changes with whole foods alongside physical activity for lasting weight loss.
Are vegetable juices better than fruit juices for weight loss?
Vegetable juices are lower in sugar than fruit juices, but whole vegetables remain superior because they provide more fibre and nutrients. Aim to eat whole vegetables rather than juice them when possible.
How much weight can I lose with juicing?
Initial weight loss from juice-only approaches is typically water loss and muscle loss, not fat loss. Sustainable weight loss requires a balanced calorie deficit of 500 kcal daily, achieved through whole foods and physical activity — not juicing alone.
What should I do instead of juicing for weight management in the UK?
Focus on whole fruits and vegetables, lean proteins, and whole grains within a calorie deficit. For eligible adults, prescription weight loss medications like GLP-1 injections (Mounjaro or Wegovy) are available through specialist services or private prescribing alongside lifestyle changes. Consult your GP for personalised advice.
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.