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
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Best Green Teas for Weight Loss
Green tea has been studied for its potential role in weight management, particularly for UK adults looking to support healthy weight loss through dietary changes. While green tea alone is not a weight loss solution, it contains compounds that may have modest benefits when combined with a calorie-controlled diet and increased physical activity. This guide explains what the evidence shows, how green tea works, and how it fits into a broader weight management strategy—whether you're managing your weight through lifestyle changes or considering prescription weight loss medication.
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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 Green Tea Supports Weight Management
Green tea contains catechins, particularly EGCG (epigallocatechin gallate), which research suggests may support fat oxidation and thermogenesis—the process your body uses to burn calories for heat. A 2016 meta-analysis found that green tea consumption was associated with modest weight loss, averaging around 1.3 kg over 12 weeks, though individual results vary significantly.
The caffeine content in green tea (approximately 25–50 mg per cup) may also provide a small metabolic boost when combined with exercise. However, this effect is modest—green tea is not a replacement for a calorie deficit, which remains the foundation of any weight loss programme. NHS weight management guidance emphasises that sustainable weight loss of 0.5–1 kg per week requires dietary change and increased physical activity, not supplements alone.
Green tea may also support hydration and provide antioxidants, which contribute to overall health alongside weight management efforts. Check your BMI using our free BMI calculator to understand your current weight category and set realistic goals.
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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.
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Best Green Teas and How to Use Them Effectively
High-quality loose-leaf green teas (such as sencha, gyokuro, and matcha) contain higher catechin levels than tea bags, though both provide benefit. Matcha—a powdered green tea—offers a concentrated dose of catechins and is increasingly popular in the UK for weight management support. Brew green tea with water at 70–80°C (not boiling) and steep for 2–3 minutes to preserve the beneficial compounds.
For weight management through nhs weight loss programmes or personal efforts, aim for 2–3 cups of green tea daily alongside a reduced-calorie diet. Green tea works best as part of a wider strategy—not as a standalone solution. If you're considering prescription weight loss medication like GLP-1 injections for weight management uk, green tea can complement that approach, but medication decisions require clinical assessment from your GP or a licensed prescriber. Use our free GLP-1 weight loss calculator to explore how prescription options might fit your goals.
- 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 green tea actually help you lose weight?
Green tea contains catechins that may support modest fat burning and metabolism. Clinical evidence shows green tea is associated with average weight loss of around 1.3 kg over 12 weeks when combined with diet and exercise. However, it's not a weight loss solution on its own—results are modest and individual outcomes vary. A calorie deficit remains the foundation of any weight loss programme.
How much green tea should I drink daily for weight loss?
The NHS and research suggest 2–3 cups of green tea daily may provide benefit. Each cup contains approximately 25–50 mg of caffeine. Drinking more than this doesn't proportionally increase weight loss effects. Green tea is best used alongside a reduced-calorie diet and increased physical activity, not as a replacement for these lifestyle changes.
Is matcha better than regular green tea for weight loss?
Matcha (powdered green tea) contains a higher concentration of catechins than brewed green tea, making it more potent per serving. However, both forms provide health benefits. Matcha is more expensive and requires a specific preparation method. The practical difference in weight loss outcomes is minimal if you're consistent with 2–3 cups daily of any quality green tea.
Can green tea replace prescription weight loss medication?
No. Green tea is a supportive dietary addition but is not equivalent to prescription weight loss medication. If you have a BMI of 30 or above, or 27+ with weight-related health conditions, your GP may refer you to specialist weight management services where prescription options like GLP-1 medications are considered. Green tea can complement either lifestyle-only approaches or medication-supported weight loss.
What's the best time to drink green tea for weight loss?
Green tea can be consumed anytime throughout the day as part of your regular fluid intake. Some evidence suggests drinking it before exercise may enhance fat burning slightly, but the difference is minimal. The most important factor is consistency—drinking 2–3 cups daily over weeks and months, alongside a calorie deficit and exercise, is more effective than timing alone.
Ready to take control of your weight loss journey?
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