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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Teas for Weight Loss: What the Evidence Shows
Many people search for teas that support weight loss, and whilst certain herbal and caffeinated teas may offer modest benefits, the evidence for significant weight loss from tea alone is limited. In the UK, adults struggling with weight management have access to more effective options alongside lifestyle changes. This guide explains what research shows about teas, and introduces prescription weight management solutions available through the NHS or private prescribing for eligible adults. If you're interested in evidence-based approaches to weight loss, we'll also cover how prescription medications like Mounjaro and Wegovy work for UK patients.
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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.
Teas and Weight Loss: What Research Shows
Green tea contains caffeine and catechins, compounds that may support metabolism modestly. Clinical studies suggest green tea drinkers may lose slightly more weight than non-drinkers, but the difference is typically small — roughly 1–3 kg over weeks or months. Black tea and oolong tea show similar modest effects.
Herbal teas like ginger, hibiscus, and peppermint are popular for digestive comfort and may support fullness, but scientific evidence for direct fat loss is weak. Caffeine-free herbal teas can be part of a healthy routine but are unlikely to produce meaningful weight loss on their own.
Key point: Tea can be part of a healthy lifestyle — it's calorie-free, hydrating, and contains antioxidants — but sustainable weight loss in the UK requires a calorie deficit. For eligible adults struggling to achieve this through diet and exercise alone, prescription weight management medication is a clinically proven option. Calculate your BMI using our free tool above to understand your current health position.
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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.
Prescription Weight Loss Options Available in the UK
For adults with a BMI of 30 or above (or 27 or above with weight-related health conditions), the NHS and private prescribing services offer prescription weight management medications. These include Mounjaro (tirzepatide), a dual GLP-1 and GIP receptor agonist, and Wegovy (semaglutide), a GLP-1 medication — both licensed in the UK for weight management.
Clinical trials show these medications help people lose an average of 15–21% of body weight when combined with reduced-calorie diet and increased activity. Access is available through NHS specialist weight management services (with waiting lists varying by region) or private online prescribing following a clinical assessment. Try our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and speak with your GP to explore whether prescription treatment is suitable for you.
- 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 tea help me lose weight?
Certain teas like green and black tea may support modest weight loss through caffeine and natural compounds, but the effect is small — typically 1–3 kg over several months. Tea works best alongside a reduced-calorie diet and exercise, not as a standalone solution. Staying hydrated with herbal or caffeinated tea is healthy, but meaningful weight loss requires a calorie deficit.
What's more effective than tea for weight loss in the UK?
For sustainable weight loss, a calorie deficit of 500 kcal per day (achieved through diet and exercise) typically produces loss of around 0.5 kg per week. For eligible adults, prescription medications like Mounjaro and Wegovy are clinically proven to support greater weight loss — averaging 15–21% of body weight in trials — when prescribed following assessment by a healthcare professional.
Am I eligible for prescription weight loss medication on the NHS?
NHS prescription weight loss medication is available for adults with a BMI of 30 or above, or 27 or above with weight-related conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Eligibility is assessed through specialist tier 3 weight management services. Speak with your GP for a referral, or check our BMI calculator above to understand your starting position.
What's the difference between Mounjaro and Wegovy?
Both are once-weekly prescription injections licensed in the UK for weight management. Mounjaro (tirzepatide) activates two hormone pathways (GIP and GLP-1), whilst Wegovy (semaglutide) activates one (GLP-1). Clinical trials show Mounjaro may support slightly greater average weight loss, but individual results vary. Your prescriber will advise which is appropriate for you.
How do I access prescription weight loss medication privately in the UK?
Private weight loss medications are available through UK-licensed online prescribing services. You'll complete an online clinical assessment with a registered prescriber, and if appropriate, receive a prescription dispensed by a GPhC-registered pharmacy. Costs range from approximately £129–£320 per month depending on dose and provider. This route doesn't require an NHS referral.
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.