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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Do Teas Really Help With Weight Loss?
Many people wonder if drinking certain teas can support weight loss. While some teas contain compounds that may have modest metabolic benefits, tea alone is not a weight loss solution. The evidence suggests that green tea and other herbal infusions can play a small role in an overall weight management strategy when combined with a healthy diet and physical activity. This guide explains what the research shows about popular weight loss teas and how they fit into realistic, sustainable weight management in the UK.
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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 Does the Research Say About Weight Loss Teas?
Scientific studies show that certain teas contain compounds with potential metabolic effects, though results are modest:
- Green tea contains catechins and caffeine that may slightly increase fat burning and thermogenesis (calorie expenditure). Studies suggest a loss of around 1–3 kg over several months when combined with diet and exercise.
- Black tea contains similar compounds but in lower concentrations than green tea.
- Oolong tea sits between green and black tea in terms of caffeine and catechin content, with some evidence for modest metabolic support.
- Herbal teas like peppermint or ginger may aid digestion and reduce bloating, but do not directly cause weight loss.
The NHS emphasises that sustainable weight loss requires a calorie deficit of around 500 kcal per day, achieved through diet and exercise. Tea can be a helpful, calorie-free beverage choice, but it is not a replacement for lifestyle changes or prescription weight management approaches.
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.
Building a Realistic Weight Loss Strategy
For effective, sustainable weight management in the UK, consider a comprehensive approach:
- Dietary changes are the foundation—focus on whole foods, reduced portions, and a calorie deficit.
- Physical activity of at least 150 minutes per week (brisk walking, cycling, swimming) supports weight loss and fitness.
- Tea as a tool—swap sugary drinks for unsweetened green or herbal tea to reduce calorie intake without sacrificing enjoyment.
- Medical support—if you have a BMI of 30 or above, or 27 or above with weight-related health conditions, your GP can discuss prescription options like GLP-1 weight loss injections alongside lifestyle changes.
Use our free BMI calculator above to check where you stand, and our GLP-1 weight loss calculator to explore all available options for weight management in the UK.
- 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.
Can green tea alone help me lose weight?
Green tea contains compounds that may slightly boost metabolism and fat burning, but studies show very modest effects—typically 1–3 kg over several months. Tea works best alongside a reduced-calorie diet and increased physical activity. On its own, tea is not a weight loss solution, though switching from sugary drinks to unsweetened green tea can help reduce calorie intake.
How much tea should I drink for weight loss?
Research suggesting metabolic benefits typically involves 2–3 cups of green tea daily. However, excessive caffeine intake can cause sleep disruption and anxiety. Aim for 2–3 cups of unsweetened green or black tea per day as part of a healthy routine, but prioritise overall dietary and exercise habits for weight loss.
Is herbal tea effective for weight loss?
Herbal teas like peppermint, ginger, and chamomile may support digestion and reduce bloating, which can make you feel lighter temporarily. However, they do not directly cause fat loss. They are a useful, calorie-free drink choice but should not be relied upon as a weight loss strategy. Focus on diet, exercise, and medical support if needed.
What's the NHS recommendation for weight loss?
The NHS recommends losing weight at 0.5–1 kg per week through a calorie deficit (approximately 500 kcal per day) combined with diet and physical activity. For some people, prescription weight loss medication—available through NHS specialist weight management services—may be recommended alongside lifestyle changes. Your GP can advise on options suitable for you.
When should I consider prescription weight loss options?
If you have a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure, your GP can refer you to specialist NHS weight management services. Prescription options like GLP-1 injections are available on the NHS and also through private prescribing. These work alongside diet and exercise for more significant weight management 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.