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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Does Green Tea Really Help With Weight Loss?
Green tea is often promoted as a natural weight loss aid, but what does the evidence actually show? While green tea contains compounds that may support weight management, it's not a standalone solution for losing weight. The truth is that sustainable weight loss in the UK requires a combination of reduced calorie intake, increased physical activity, and sometimes prescription support. This guide explains what green tea can and cannot do, and how it fits into a realistic weight loss strategy.
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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 Say About Green Tea?
Several studies have investigated green tea's effect on weight loss, with mixed results. Green tea contains catechins (natural compounds) and caffeine, which together may slightly boost metabolism and fat oxidation. However, the effect is modest. Research suggests green tea may support weight loss of approximately 0.3 to 0.5 kg per month when combined with a calorie-controlled diet — far less than prescription weight loss medication.
A systematic review in the European Journal of Nutrition found that green tea extract showed small but statistically significant weight loss effects in some trials, but results were inconsistent. Most studies used concentrated extract doses higher than typical tea consumption. The NHS notes that whilst green tea contains antioxidants beneficial for general health, it should not be relied upon as a primary weight loss tool. For meaningful weight management, the NHS recommends a calorie deficit of approximately 500 kcal per day, which typically results in losing 0.5 to 1 kg per week.
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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.
How Does Green Tea Fit Into Your Weight Loss Plan?
Green tea can be a useful supportive element in a weight loss strategy, but not a replacement for diet and exercise. It may help with feelings of fullness due to its caffeine content, and the ritual of drinking tea can support healthy habits. However, if you're looking for significant weight loss results, you'll need a structured approach: a reduced-calorie diet, regular physical activity, and potentially prescription support.
For UK adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, prescription weight loss medication may be appropriate. Our free GLP-1 weight loss calculator can help you understand how prescription options like Mounjaro or Wegovy might support your goals alongside lifestyle changes. Use our BMI calculator to check where you currently sit, then speak with your GP about the right approach for your circumstances.
- 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 green tea help me lose weight?
Green tea may provide modest support for weight loss, but the effect is small — typically around 0.3 to 0.5 kg per month. It works best as part of a broader strategy including reduced calories and exercise, not as a standalone solution. The catechins and caffeine in green tea may slightly boost metabolism, but results vary between individuals.
How much green tea do I need to drink for weight loss?
Most research showing weight loss benefits used concentrated green tea extract — drinking regular green tea provides smaller amounts of the active compounds. Typically, 2 to 3 cups daily is recommended for general health benefits, but this is unlikely to cause significant weight loss without dietary changes. More importantly, ensure total daily calorie intake supports your weight loss goal.
Is green tea better than prescription weight loss medication?
No. Green tea is a natural beverage with modest supportive effects. Prescription weight loss medications like Mounjaro and Wegovy are evidence-based treatments that, in clinical trials, supported weight loss of 15 to 21% of body weight. These require a prescription and clinical assessment. Green tea is a complement to lifestyle changes, not a replacement for professional treatment if you're eligible.
Can I use green tea instead of changing my diet?
No. Weight loss requires a calorie deficit — you must consume fewer calories than you burn. Green tea cannot create this deficit on its own. The NHS recommends losing weight at 0.5 to 1 kg per week through reduced-calorie eating and physical activity. Green tea can support these habits, but dietary change is essential.
What's the best approach to weight loss in the UK?
The NHS recommends starting with Tier 1 support: using free tools like our BMI calculator, following a reduced-calorie diet plan, and increasing physical activity. If you have a BMI of 30 or above, or 27 or above with health conditions, ask your GP about referral to specialist weight management services (Tier 3), where prescription options may be considered alongside lifestyle support.
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.