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
Juicing for Weight Loss — What Works and What Doesn't
Juicing can be part of a weight loss strategy, but it's not a standalone solution. Fresh vegetable and low-sugar fruit juices may help reduce calorie intake and increase nutrient intake, especially if they replace sugary drinks. However, many commercial juices are high in natural sugars and lack the fibre of whole fruits, meaning they're less filling than eating whole produce. For sustainable weight management in the UK, juicing works best when combined with a balanced diet, regular physical activity, and professional support if needed.
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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.
Juicing for Weight Loss — Does It Actually Work?
Juicing alone does not typically lead to significant sustained weight loss. Here's why: most juices, even freshly made ones, contain concentrated sugars from fruit without the fibre that makes whole fruit filling. A glass of juice can contain the sugar of 3–4 whole fruits but won't trigger the same satiety signals. Store-bought juices often contain added sugars, making them calorie-dense.
That said, juicing can support weight management UK strategies when used strategically:
- Vegetable-based juices (spinach, celery, cucumber) are low in calories and can replace high-sugar beverages
- Juicing can increase micronutrient intake while creating a modest calorie deficit
- Some people use juice as a meal component, not a meal replacement
- Combining juicing with a reduced-calorie diet and increased physical activity yields better results
For sustainable results, most evidence supports whole-food approaches over juicing alone.
Clinically BackedWeight Loss
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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 in the UK
For adults struggling with weight loss in the UK, prescription medications offer a clinically proven option. GLP-1 weight loss injections like Mounjaro (tirzepatide) and Wegovy (semaglutide) are now available through NHS specialist services and private prescribers, alongside Saxenda (liraglutide). Clinical trials show these medications help reduce appetite and support consistent weight loss when combined with lifestyle changes like improved diet and activity.
You may be eligible if your BMI is 30 or above, or 27–29.9 with weight-related health conditions. Use our free BMI calculator above to check your starting point. Your GP can discuss whether prescription weight loss medication might complement dietary changes like juicing as part of a comprehensive approach.
Access to weight loss medication differs between NHS and private routes. NHS weight loss medication is available through tier 3 specialist weight management services — your GP can refer you. Waiting times vary significantly by region. Private prescribing is faster, requiring an online clinical assessment through a UK-licensed prescriber and a GPhC-registered pharmacy. Individual results with medication vary, but clinical evidence shows average weight loss of 15–21% of body weight over 68 weeks when combined with lifestyle modifications. Always consult your GP to discuss whether medication is appropriate for your situation.
- 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.
Can juice cleanses help you lose weight quickly?
Juice cleanses may cause rapid initial water weight loss, but this is not sustainable fat loss. Most weight returns once normal eating resumes. Cleanses lack protein and can cause muscle loss. The NHS recommends steady weight loss of 0.5–1 kg weekly through balanced diet and activity, not restrictive juice protocols.
What's the best juice for weight loss?
Low-sugar vegetable juices work best: spinach, celery, cucumber, and leafy greens. Avoid high-sugar fruit juices. Vegetable juices are lower in calories but should complement whole foods, not replace meals. Whole vegetables are always preferable as they contain fibre that promotes fullness.
How does juicing compare to prescription weight loss medication?
Juicing is a dietary approach; prescription medications like Mounjaro work through hormonal pathways to reduce appetite. Clinical trials show GLP-1 medications produce more consistent weight loss than diet changes alone. Both work best combined with healthy eating and activity. Your GP can advise which approach suits you.
Am I eligible for NHS weight loss medication in the UK?
You may be eligible if your BMI is 30 or above, or 27–29.9 with weight-related health conditions like diabetes or hypertension. South Asian, Chinese, Black African, and Black Caribbean adults have lower eligibility thresholds (BMI 27.5+). Ask your GP for a specialist referral to a weight management service.
How can I track my weight loss progress?
Use our free progress tracker on this page to log your weight weekly. Combine it with our BMI calculator to monitor changes in your BMI category. Track lifestyle habits too — diet quality, activity levels, energy — as these often shift before the scale changes. Aim for 0.5–1 kg loss per week for sustainable results.
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.