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 Help With Weight Loss?
Lemon is often promoted as a weight loss aid, but the evidence for its effectiveness is limited. While lemon water may support hydration and digestion, it won't directly cause weight loss on its own. Sustainable weight management in the UK involves creating a calorie deficit through balanced nutrition and physical activity. If you're struggling with your weight, your GP can discuss evidence-based approaches including lifestyle changes, and prescription weight loss medication if appropriate. Our free BMI calculator can help you understand where you stand health-wise.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Say About Lemon and Weight Loss?
Lemon contains citric acid and vitamin C, which are beneficial for health, but there is no strong clinical evidence that lemon directly causes weight loss. Some studies suggest that drinking water with lemon may slightly boost metabolism, but the effect is negligible and temporary. Lemon water is also promoted for digestive support and appetite suppression, but these effects are minor compared to what's needed for meaningful weight loss.
What lemon can do is help you stay hydrated and may make plain water more appealing, which supports overall health. Proper hydration is linked to better metabolism and can reduce thirst-driven eating. However, drinking lemon water alone will not create the calorie deficit required for weight loss. The NHS emphasises that sustainable weight loss requires reducing calorie intake and increasing physical activity — not relying on individual foods or drinks.
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.
Proven Weight Loss Approaches in the UK
For evidence-based weight management, the NHS recommends a reduced-calorie diet combined with regular physical activity. A deficit of approximately 500 kcal per day typically results in a loss of 0.5 kg per week. Your GP can discuss weight loss medication if you have a BMI of 30 or above (or 27 or above with weight-related health conditions such as type 2 diabetes or high blood pressure).
Prescription weight loss injections like GLP-1 medications are available through the NHS or private prescription, and clinical trials show they can support significant weight loss alongside lifestyle changes. Try our GLP-1 weight loss calculator to explore potential outcomes, or use our weight loss progress tracker to monitor your journey as you make dietary and activity changes.
- 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 may support hydration and overall health, but it won't directly cause weight loss. Weight loss requires a calorie deficit. Drinking lemon water is a healthy habit, but it must be combined with reduced calories and increased physical activity to be effective.
Does lemon boost metabolism?
Some studies suggest lemon's vitamin C and citric acid may have a very minor, temporary effect on metabolism, but the effect is too small to be meaningful for weight loss. Metabolism is controlled by many factors including age, muscle mass, and genetics — not by individual foods.
What actually works for weight loss in the UK?
The NHS recommends a calorie deficit (typically 500 kcal/day), regular physical activity, and behavioural changes. For some people, prescription weight loss medication may be appropriate. Your GP can assess whether you're eligible and discuss the best approach for your situation.
Can I use lemon water with weight loss medication?
Yes, lemon water is safe to use alongside diet, exercise, and prescription weight loss treatment. However, if you're taking oral medications, lemon water should not be consumed at the same time as some medications (consult your pharmacist or GP for specific advice).
What's the fastest way to lose weight in the UK?
Very gradual weight management can lead to muscle loss and nutrient deficiencies. The NHS recommends losing 0.5–1 kg per week for sustainable results. Your GP can discuss prescription weight loss injections if you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). Our BMI calculator can help you check your starting point.
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.