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
What Drinks Are Good For Weight Loss?
The drinks you choose can significantly impact your weight management journey. Water remains the best choice for weight loss, but several other beverages can support your goals when chosen wisely. This guide covers evidence-based drink options, what to avoid, and how beverages fit into NHS weight loss guidance. Whether you're exploring lifestyle changes or considering prescription weight loss medication, understanding hydration and beverage choices is essential for sustainable results.
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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 Drinks for Weight Loss
Water is the single best drink for weight loss — it has zero calories, supports metabolic function, and helps you feel fuller between meals. Aim for 6–8 glasses daily, as recommended by NHS guidance.
Unsweetened tea and coffee can support weight loss when consumed without added sugar or cream. Green tea contains small amounts of caffeine and catechins, which may boost metabolism slightly. Black tea and coffee (without milk or sugar) are calorie-free alternatives that many people find help with appetite control.
Herbal teas like chamomile, peppermint, and ginger tea are naturally caffeine-free and can be enjoyed throughout the day without affecting calorie intake. They may help with digestion and bloating.
Sparkling water is a refreshing, zero-calorie alternative to sugary soft drinks. Some people find carbonation helps them feel fuller faster, making it easier to stick to a calorie deficit for sustainable weight management.
Drinks to avoid or limit: sugary soft drinks, energy drinks, sweetened fruit juices, alcohol (high calorie density), and heavily sweetened coffee shop beverages. These add calories without nutritional benefit and can trigger cravings.
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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 Beverages Fit Into Your Weight Loss Plan
Drinks account for a significant portion of many people's daily calorie intake — often without realisation. By switching to zero or low-calorie options, you can create a calorie deficit more easily, which is essential for weight loss. The NHS recommends a deficit of approximately 500 kcal per day for sustainable loss of around 0.5 kg per week.
If you're using prescription weight loss medication such as GLP-1 injections (Mounjaro or Wegovy), beverage choices remain important. These medications work alongside lifestyle changes, not instead of them. Our GLP-1 weight loss calculator can help you understand potential results when combining medication with dietary changes including smart beverage choices. Remember that individual results vary, and your GP or prescriber can provide personalised guidance on integrating drinks into your overall weight management plan.
- 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.
Is diet cola or zero-sugar soft drinks good for weight loss?
Diet drinks contain zero or very few calories, so they won't directly cause weight gain. However, some research suggests artificial sweeteners may trigger cravings for sweet foods in some people, making them less ideal than water or unsweetened tea. Water remains the best choice for weight loss in the UK and is what NHS guidance recommends prioritising.
Can coffee help with weight loss?
Black coffee (without milk, cream, or sugar) is calorie-free and contains caffeine, which may slightly boost metabolism and help with appetite suppression. A cup of black coffee before exercise may provide modest benefits. However, coffee shop beverages loaded with syrups, milk, and sugar can contain 200+ calories — these should be avoided or counted within your daily intake.
Is alcohol acceptable during weight loss?
Alcohol is high in calories (7 kcal per gram) and offers little nutritional value, making it counterproductive for weight loss. A single alcoholic drink can contain 100–300 calories. If you choose to drink, limit intake and account for it within your daily calorie deficit. Your GP can advise on safe alcohol limits alongside any weight loss medication.
What about fruit juices and smoothies?
Even unsweetened fruit juice is high in natural sugars and calories — a glass of orange juice contains approximately 100 calories with minimal fibre. Whole fruits are preferable as they contain fibre and keep you fuller longer. If you make smoothies, include protein powder, Greek yoghurt, and leafy greens rather than relying on juice as a base.
Should I drink water before meals to aid weight loss?
Drinking water before or with meals can help you feel fuller, potentially reducing portion sizes. Some studies suggest this may support modest weight loss as part of a calorie deficit strategy. However, water alone won't cause weight loss — you still need to maintain a calorie deficit. Use our BMI calculator and weight converter to understand your baseline, then track progress with our free progress tracker.
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.