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
Does Lemon Juice Help With Weight Loss?
Lemon juice is often promoted as a weight loss aid, but the evidence doesn't support it as an effective standalone solution. While lemon contains vitamin C and antioxidants, there's no scientific proof that drinking lemon water burns fat or significantly boosts metabolism. Weight loss requires a calorie deficit and lifestyle changes. If you're serious about losing weight, evidence-based approaches—including prescription weight loss medication where appropriate, dietary changes, and increased physical activity—are far more effective than relying on citrus drinks alone. Your GP can discuss personalised options for your situation.
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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.
What Does the Science Actually Say?
Several claims about lemon juice and weight loss circulate online, but rigorous clinical evidence is lacking. Some suggest lemon juice boosts metabolism or aids fat burning; however, controlled studies have not confirmed these effects. A small 2016 study suggested lemon polyphenols *may* help with weight gain prevention in mice, but human evidence remains very limited. Lemon water is low in calories (around 6 kcal per 100ml freshly squeezed), so it won't sabotage your calorie intake if you drink it instead of sugary drinks—which is genuinely helpful for weight management in the UK. The real benefit of lemon water is hydration and potential displacement of high-calorie beverages, not metabolic acceleration. If you're looking for evidence-backed weight loss medication, speak to your GP about specialist weight management options.
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.
What Actually Works for Weight Loss?
Sustainable weight loss in the UK requires a calorie deficit of roughly 500 kcal per day to lose approximately 0.5 kg per week, according to NHS weight loss guidance. Effective approaches include balanced nutrition, regular physical activity, and behaviour change support. For adults meeting eligibility criteria—BMI 30 or above, or 27–29.9 with weight-related health conditions—prescription weight loss medication may be considered through NHS specialist services or private clinical assessment. Our free GLP-1 weight loss calculator can help you explore potential outcomes with evidence-based treatment options. Your GP is the best starting point for personalised advice 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.
Will drinking lemon water alone help me lose weight?
No. Lemon water alone cannot produce weight loss without a calorie deficit. It's low in calories and supports hydration, which is helpful, but it has no special fat-burning properties. Weight loss requires dietary changes and increased activity—not citrus drinks.
Is there any science behind lemon juice for weight loss?
Very limited. Animal studies suggest some polyphenols in lemon *may* have antioxidant benefits, but human clinical trials supporting weight loss claims don't exist. Lemon water is fine to drink, but don't expect it to replace proper diet or exercise.
What are evidence-based ways to lose weight in the UK?
Create a calorie deficit (around 500 kcal daily for 0.5 kg weekly loss), eat a balanced diet, increase physical activity, and get behaviour change support. For eligible adults, prescription weight loss medication approved by the NHS is another option worth discussing with your GP.
Can I use lemon juice alongside prescription weight loss treatment?
Yes, lemon water is safe alongside any weight loss approach. However, it should not be relied upon as treatment. Prescription medications work through hormonal mechanisms (such as GLP-1 activation), not through lemon juice effects. Always follow your prescriber's guidance.
Should I see my GP before trying lemon juice for weight loss?
You don't need GP approval for lemon juice itself, but if you're struggling with weight management, your GP can assess your BMI, discuss your health, and recommend proven approaches—including medication or specialist referral if appropriate.
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.