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
Is Lemon Good For Weight Loss?
Lemon is often promoted as a weight loss aid, but the evidence is more modest than marketing claims suggest. While lemon water may support hydration and has some minor metabolic benefits, it's not a standalone weight loss solution. Real, sustainable weight management in the UK requires a combination of dietary changes, physical activity, and in some cases, prescription support from your GP or healthcare provider.
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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 Research Actually Show?
Scientific evidence on lemon and weight loss is limited. Some studies suggest lemon juice may have a small effect on metabolism due to its vitamin C content, and staying hydrated with lemon water instead of sugary drinks can reduce calorie intake. However, the weight loss effect from lemon alone is negligible — typically less than 1% of body weight over several weeks.
- Lemon water has virtually zero calories and can replace high-calorie drinks
- The acidity in lemon may marginally improve digestion and satiety
- Vitamin C supports overall health but doesn't directly burn fat
- Any weight loss from lemon water is primarily from drinking more water and eating fewer calories overall
NHS weight loss guidance emphasises that sustainable weight management comes from a calorie deficit, balanced nutrition, and physical activity — not from individual foods or drinks. Lemon is a healthy addition to your diet but should never be relied upon as a weight loss strategy on its own.
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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.
Real Weight Management: What Actually Works
For meaningful weight loss in the UK, focus on evidence-based approaches: create a sustained calorie deficit of around 500 kcal per day to lose approximately 0.5 to 1 kg per week, according to NHS guidelines. This means reducing portion sizes, choosing whole foods, and increasing physical activity.
If you're struggling with weight management despite dietary changes, your GP can discuss prescription options including GLP-1 medications like Mounjaro or Wegovy, which are prescription-only weight loss injections available through NHS specialist services or private assessment. Use our free BMI calculator and GLP-1 weight loss calculator above to understand your starting point and explore all available options with your healthcare provider.
- 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.
Does lemon water burn belly fat?
No. Lemon water does not target or burn belly fat specifically. However, drinking lemon water instead of sugary drinks can reduce overall calorie intake, which may contribute to gradual fat loss over time when combined with a balanced diet and exercise.
How much weight can you lose drinking lemon water?
On its own, lemon water produces negligible weight loss — typically less than 1% of body weight. Any meaningful weight loss comes from overall calorie reduction and lifestyle changes, not from lemon alone. The NHS recommends losing 0.5 to 1 kg per week through diet and activity.
Is lemon water better than water for weight loss?
For weight loss purposes, plain water and lemon water are functionally equivalent — both have zero calories and support hydration. Lemon water may taste better to some people, encouraging them to drink more fluids, which indirectly supports weight management. But if you prefer plain water, there's no advantage to adding lemon.
Can lemon help with weight loss medication like Mounjaro?
Lemon water won't enhance the effects of prescription weight loss medication. Mounjaro and Wegovy work through GLP-1 receptor activation to regulate appetite and support weight loss. These medications are most effective alongside a reduced-calorie diet and physical activity — lemon water is simply a healthy, calorie-free beverage choice during treatment.
What's the best weight loss approach in the UK?
The NHS recommends a combination of dietary changes (500 kcal daily deficit), regular physical activity, and behavioural support. If self-help approaches aren't effective, your GP can refer you to specialist weight management services or discuss prescription medications. Start with our free BMI calculator to assess your health status.
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.