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 Detox Juices Help With Weight Loss?
Detox juices are often marketed as a quick weight loss solution, but the evidence suggests they're not a reliable standalone approach. While some juices can be part of a healthy diet, sustainable weight loss requires a calorie deficit, consistent exercise, and long-term lifestyle changes. In the UK, the NHS recommends losing weight at a rate of 0.5 to 1 kg per week for the best results. If you're looking for evidence-based support, prescription weight management options may be worth discussing with your GP.
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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.
How Detox Juices Are Marketed vs What the Evidence Shows
Detox juices are typically promoted as a way to "cleanse" the body and trigger gradual weight management. However, your liver and kidneys already detoxify your body naturally—no special juices are needed. Many commercial detox juice cleanses are high in sugar and low in protein and fibre, which means they don't keep you feeling full and can cause blood sugar spikes.
What the evidence shows:
- Juice cleanses may cause short-term weight loss, but it's largely water weight and glycogen depletion, not fat loss
- Very low-calorie juice diets can slow metabolism and lead to muscle loss
- Most people regain weight quickly after stopping a juice cleanse
- Sustainable weight loss comes from a balanced calorie deficit alongside regular physical activity
If you're interested in weight management in the UK, the NHS Weight Loss Plan and structured programmes offer evidence-based approaches that work better than temporary juice cleanses.
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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 Approaches to Weight Loss Than Detox Juices
Rather than relying on detox juices, focus on proven strategies: eat whole foods with plenty of vegetables, stay hydrated with water, and aim for a sustainable calorie deficit of around 500 kcal per day, which typically results in losing about 0.5 kg per week. Strength training and cardiovascular exercise are essential for preserving muscle during weight loss.
For prescription weight loss in the UK, medications like GLP-1 injections can help suppress appetite and support weight loss alongside diet and exercise. These require a clinical assessment from your GP or a licensed prescriber. You can use our free BMI calculator above to check your current status, and our GLP-1 weight loss calculator to explore potential outcomes if you're eligible for prescription support.
Try tracking your progress with our free progress tracker to monitor actual weight loss rather than relying on unproven detox methods. Weight management in the UK is supported by NHS guidance, structured programmes, and—when appropriate—prescription medication. Consistent small changes to diet and activity levels, combined with professional support if needed, deliver far better long-term results than any juice cleanse.
- 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.
Do detox juice cleanses actually help you lose weight?
Short-term weight loss from juice cleanses is usually water weight and glycogen loss, not fat loss. Most people regain the weight quickly because the cleanses don't teach sustainable eating habits. For lasting results, the NHS recommends a consistent calorie deficit of around 500 kcal daily, combined with exercise.
Are detox juices safe to use for weight loss?
Very restrictive juice diets can be unsafe—they may lack essential nutrients, cause muscle loss, and slow metabolism. Always speak to your GP before starting any extreme diet. Balanced, whole-food approaches are safer and more effective.
What's a better alternative to detox juices for losing weight?
Focus on whole foods, adequate protein, regular exercise, and a sustainable calorie deficit. The NHS Weight Loss Plan and structured weight management programmes offer evidence-based support. For eligible adults, prescription weight loss medications like GLP-1 injections can help alongside lifestyle changes.
Can I combine detox juices with exercise for faster weight loss?
Combining juice cleanses with exercise isn't recommended—you'll lack the calories and nutrients needed to fuel workouts and recover. Instead, eat balanced meals with sufficient calories, exercise regularly, and maintain a modest calorie deficit for sustainable weight loss.
How quickly will I lose weight if I follow an NHS weight loss plan instead of detox juices?
The NHS recommends losing 0.5 to 1 kg per week for sustainable results. This may seem slower than juice cleanses claim, but it's fat loss, not water weight, and the weight typically stays off. Combine it with our free progress tracker to monitor real results over time.
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.