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
When to Have Green Tea for Weight Loss
Green tea has been studied for its potential role in supporting weight management, but timing matters less than consistent use. The catechins and caffeine in green tea may modestly boost metabolism and fat oxidation, though the effect is relatively small on its own. For sustainable weight loss in the UK, green tea works best alongside a reduced-calorie diet, increased physical activity, and realistic expectations. If you're considering prescription weight loss medication alongside lifestyle changes, our GLP-1 weight loss calculator can help you understand the full picture of weight management options available to you.
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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.
Best Times to Drink Green Tea for Weight Loss
Timing is less important than consistency. Green tea's modest metabolism-boosting effects come from compounds called catechins and caffeine, which are present whenever you drink it. However, research suggests a few practical approaches:
- Morning or early afternoon: Drinking green tea before meals may help with portion control and provide a caffeine boost for activity, though evidence is limited
- Before exercise: The caffeine may provide a small energy lift, potentially supporting slightly increased activity
- Spread throughout the day: 2–3 cups daily (spaced out) is more practical than timing a single cup
- Avoid late evening: Caffeine may affect sleep, and poor sleep is linked to weight gain
Research shows green tea contributes to weight loss only when combined with calorie reduction. A cup contains approximately 25–50mg of caffeine and negligible calories—far less caffeine than coffee. For meaningful weight management in the UK, green tea is a helpful addition to a broader weight loss strategy, not a standalone solution.
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.
Green Tea and Weight Management Context
Green tea alone cannot replace the fundamental requirements for weight loss: a calorie deficit and physical activity. The NHS recommends losing weight at a rate of 0.5–1kg per week through sustainable lifestyle changes. Green tea may provide marginal metabolic support (approximately 3–5% increase in daily energy expenditure in some studies), but this is modest compared to diet and exercise impact.
If you have a BMI over 30, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure, you may be eligible for prescription weight loss medication alongside lifestyle changes. Use our free BMI calculator to check where you sit on the NHS weight categories, and speak with your GP about all available weight management options, including prescription treatment if appropriate.
- 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.
What time of day should I drink green tea for weight loss?
There's no single "best time"—consistency matters more. Morning or early afternoon is practical, especially before meals or exercise. Avoid late evening due to caffeine, which can interfere with sleep. Aim for 2–3 cups daily spread throughout the day rather than timing one specific cup.
How much weight can I lose by drinking green tea?
Green tea alone has minimal weight loss impact. Research suggests it may contribute to a 1–3kg loss over 12 weeks when combined with calorie reduction, but this is modest. Sustainable weight loss requires a calorie deficit of approximately 500 kcal/day, which comes primarily from diet and activity, not from green tea.
Does green tea boost metabolism?
Green tea contains catechins and caffeine that may modestly increase metabolism by approximately 3–5% in some studies. However, this effect is small and only appears when combined with calorie restriction and activity. It's not a metabolic game-changer on its own.
Can green tea replace other weight loss methods?
No. Green tea is a supportive addition to a broader weight management strategy. The NHS recommends sustainable weight loss through calorie deficit and physical activity. If you're struggling with weight management, speak with your GP about all options, including NHS weight loss programmes or prescription medication if eligible.
Is green tea safe for weight loss in the UK?
Yes, green tea is safe for most adults. Each cup contains only 25–50mg of caffeine (far less than coffee) and virtually no calories. However, excessive consumption (more than 8–10 cups daily) may cause caffeine-related side effects. Always speak with your GP if you're on medications, as green tea can interact with some prescriptions.
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.