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 Lemons Help Weight Loss?
Lemons are often promoted as a weight loss aid, but the evidence is mixed. While lemons contain beneficial compounds like vitamin C and fibre, there's no scientific proof that lemon juice or lemon water directly causes weight loss. However, lemons may support weight management when used alongside a balanced diet and healthy lifestyle. For sustainable weight loss in the UK, the NHS recommends a combination of reduced-calorie eating, physical activity, and — when appropriate — clinical support. Understanding what actually works is key to achieving lasting results.
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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 the Science Says About Lemons and Weight Loss
Lemon juice contains citric acid, vitamin C, and fibre, which have some health benefits, but they don't directly trigger weight loss. Some people claim that lemon water increases metabolism or burns fat — but research doesn't support this. A 2015 review found no strong evidence that lemon juice alone causes significant weight loss.
What lemons can do is:
- Add flavour to water, encouraging better hydration
- Provide vitamin C and antioxidants
- Support digestion when consumed with meals
- Help you feel fuller if consumed before eating (due to fibre and acidity)
The key point: lemons aren't a clinically supported solution for weight loss. Weight loss happens through calorie deficit — consuming fewer calories than you burn. If lemon water helps you drink more water and eat fewer sugary drinks, that's a genuine benefit. But the lemons themselves aren't doing the heavy lifting.
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.
Sustainable Weight Loss: What Actually Works in the UK
For sustainable weight loss, the NHS recommends focusing on calorie deficit, regular activity, and behavioural changes. Losing 0.5–1 kg per week is the safe target. This means reducing your daily intake by approximately 500 kcal through diet and exercise combined.
If you're struggling with weight management UK-wide, several evidence-based options exist: dietary changes, increased physical activity, specialist support through your GP, or — for some people — prescription weight loss medication following clinical assessment. Our free BMI calculator can help you understand your current weight status, and our weight loss calculator can show you what realistic progress looks like with structured support.
- 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 help me lose weight?
Lemon water itself doesn't cause weight loss, but it can help indirectly by improving hydration and replacing sugary drinks. Weight loss happens through calorie deficit. If lemon water helps you consume fewer calories overall, that's beneficial — but the lemons alone aren't responsible for the loss.
Does lemon juice boost metabolism?
No scientific evidence supports the claim that lemon juice boosts metabolism significantly. While lemons contain vitamin C and antioxidants, these don't directly increase metabolic rate. A healthy metabolism is supported by regular physical activity, adequate protein, and sufficient sleep — not lemon juice.
Can I lose weight just by drinking lemon water?
No. Weight loss requires a calorie deficit — consuming fewer calories than you burn. Lemon water alone cannot create this deficit. You'll need to combine hydration, balanced nutrition, and physical activity. For personalised advice, speak to your GP.
What's the best way to use lemons for weight management?
Add lemon juice to water to increase flavour and hydration. Use it as a dressing on salads and vegetables to add taste without calories. Include whole lemons in your diet for fibre. These are practical additions to a calorie-controlled diet — but they're supporting tools, not weight loss solutions themselves.
Are there medications that actually help with weight loss in the UK?
Yes. GLP-1 weight loss injections like Mounjaro and Wegovy are prescription-only medications licensed in the UK for weight management. Clinical trials show they can support significant weight loss alongside diet and exercise. Eligibility depends on BMI and health status. Speak to your GP or a licensed prescriber for assessment.
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.