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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Juicing and Weight Loss — What UK Adults Need to Know
Juicing is often promoted as a quick weight loss solution, but the evidence suggests it's less effective than whole foods for sustainable weight management. While fresh juice contains vitamins and nutrients, it's high in natural sugars and lacks the fibre of whole fruit. For adults seeking evidence-based weight loss support in the UK, prescription medications and lifestyle changes are more reliable options. This guide covers what juicing actually does for weight loss and the medication alternatives available through the NHS and private prescribing.
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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 Juicing Affects Weight Loss and UK Weight Management Options
Juicing removes most fibre from fruit, leaving behind concentrated sugars and calories without the satiety benefits of whole foods. A typical juice glass (250ml) can contain 100–150 kcal with 20–30g of natural sugars — equivalent to eating 3–4 whole fruits but without the fullness feeling. This makes it easy to consume excess calories without realising.
- Whole fruit vs juice: 1 apple (95 kcal, 4g fibre) vs apple juice (110 kcal, 0.5g fibre) — the fibre difference is significant for appetite control.
- Weight loss reality: Juice diets typically show rapid water loss (2–3 kg in 1–2 weeks) but minimal fat loss. Results rarely stick because the underlying diet isn't sustainable.
- NHS guidance: The NHS recommends limiting juice to 150ml per day as part of a balanced diet, not as a weight loss tool.
For adults in the UK struggling with weight management, evidence-based approaches like reduced-calorie diets, increased physical activity, and prescription weight loss medications (for eligible individuals) offer more sustainable results than juice-based detox programmes.
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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.
Prescription Weight Loss Options Available in the UK
UK-licensed weight loss medications are available for adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide) are prescription-only and work alongside diet and exercise changes, not instead of them. Clinical trials show average weight loss of 15–21% of body weight over 6–12 months — significantly more reliable than juicing alone.
- NHS access: Through specialist tier 3 weight management services — refer to your GP to explore eligibility and local availability.
- Private access: Via GPhC-registered online prescribers following a clinical assessment — no NHS referral needed.
Use our free BMI calculator above to check if you might be eligible, and our GLP-1 weight loss calculator to explore potential outcomes with prescription medication.
- 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 juicing good for weight loss?
Juicing can be part of a balanced diet but is not ideal for weight loss. Juice lacks the fibre of whole fruit, leaves you feeling less full, and concentrates sugars and calories. The NHS recommends limiting juice to 150ml daily. For sustainable weight loss, whole foods, calorie control, and increased activity are more effective than juice diets.
How much weight can you lose with juice diets?
Juice diets typically show rapid water loss (2–3 kg in 1–2 weeks) but minimal actual fat loss. Weight usually returns quickly because the diet isn't sustainable long-term. The NHS recommends losing 0.5–1 kg per week through balanced nutrition and activity for lasting results.
What prescription weight loss options are available in the UK?
Mounjaro, Wegovy, and Saxenda are prescription-only weight loss medications licensed in the UK for adults with a BMI of 30+, or 27–29.9 with weight-related conditions. Clinical trials show average weight loss of 15–21% of body weight. Access is through NHS specialist services or private online prescribers. Individual results vary.
How do I find out if I'm eligible for weight loss medication in the UK?
Eligibility typically requires a BMI of 30 or above, or 27–29.9 with conditions like type 2 diabetes or hypertension. Use our free BMI calculator above to check your BMI. Then speak to your GP about referral to specialist weight management services, or consult a private UK-licensed prescriber for a clinical assessment.
Are juicing and weight loss medication both needed?
No — they serve different purposes. Juicing alone is not an effective weight loss tool. Prescription weight loss medications work best alongside a reduced-calorie balanced diet and increased physical activity, not with juice-only diets. Your GP or prescriber will advise on the best combined approach for your health.
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.