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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Healthy Drinks for Weight Loss
When managing your weight in the UK, what you drink matters as much as what you eat. Many everyday drinks contain hidden calories, sugar, and additives that can sabotage weight loss efforts. This guide covers the healthiest beverages to support weight management, from water to herbal teas, and explains how smart drink choices fit into an effective weight loss strategy alongside diet, exercise, and where relevant, prescription weight loss medication prescribed following clinical assessment.
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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 and Weight Management
Water is the gold standard — it has zero calories, supports hydration, and helps regulate appetite. The NHS recommends drinking 6–8 glasses of fluid daily. Many people confuse thirst with hunger, so staying hydrated can reduce unnecessary snacking.
Other excellent low-calorie options include:
- Herbal and green teas — naturally caffeine-free or low-caffeine, zero calories (unsweetened)
- Black coffee — zero calories, may slightly boost metabolism through caffeine
- Sparkling water — zero calories, refreshing, satisfies the desire for fizzy drinks
- Milk-based drinks — semi-skimmed or skimmed milk provides protein and satiety, supporting weight management UK goals
- Vegetable juices — low-sugar options like tomato juice (unsweetened) provide nutrients without excessive calories
Avoid or severely limit sugary drinks, energy drinks, full-fat milk drinks, and alcohol — these are calorie-dense and provide little nutritional benefit. A single 330ml sugary soft drink can contain 140+ calories and up to 35g of added sugar, easily undermining weight loss efforts.
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.
Drinks to Avoid and Practical Swaps
High-calorie drinks that sabotage weight loss: Full-sugar soft drinks (140–180 calories per can), flavoured coffee drinks (200–400 calories), sweetened juice drinks, alcohol (7 calories per gram — more than carbs or protein), and sweetened plant-based milk alternatives.
Make simple swaps: replace sugary drinks with sparkling water, swap coffee shop lattes for black coffee or tea, choose water over juice, and limit alcohol to occasional consumption. When following a prescribed weight loss plan — whether through lifestyle changes alone or alongside medications like GLP-1 injections — consistent hydration supports your body's ability to process food efficiently and manage hunger signals. Use our free BMI calculator to track where you sit on the NHS weight loss scale, and our GLP-1 weight loss calculator to explore how medication might fit into your overall weight management strategy alongside these dietary changes.
- 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.
Are diet drinks better than sugary drinks for weight loss?
Diet drinks contain zero or very few calories, making them better than sugary versions. However, some evidence suggests artificial sweeteners may affect appetite regulation and taste preferences. Water, tea, and coffee are superior choices. Occasional diet drinks are fine, but water should be your primary beverage.
Does green tea help with weight loss?
Green tea contains catechins and a small amount of caffeine, which may provide a modest metabolic boost. Studies show the effect is small — roughly 3–4% increase in fat burning. It's not a weight loss solution alone, but it's a healthy, zero-calorie drink that supports overall weight management when combined with calorie deficit and exercise.
Can I drink alcohol while trying to lose weight?
Alcohol is calorie-dense (7 calories per gram) and often consumed with high-calorie mixers. A pint of lager contains around 180 calories; a large wine glass around 160–200 calories. Regular alcohol consumption can significantly hinder weight loss. Occasional moderate drinking is acceptable, but frequent consumption should be minimised during active weight loss phases.
What's the best drink to have before exercise for weight loss?
Water is ideal — it hydrates without adding calories. For longer workouts (over 60 minutes), a small carbohydrate source like diluted fruit juice (20–30g carbs) can help maintain energy. Avoid sugary energy drinks. Post-exercise, water or unsweetened milk (which provides protein for recovery) are best choices.
Does drinking water before meals really help you lose weight?
Drinking water before meals may help create a sense of fullness, potentially reducing portion sizes. Studies show modest benefits — perhaps 2–3 kg additional weight loss over several months when combined with calorie reduction. It's a simple, free, healthy habit that supports weight loss efforts, particularly when paired with NHS weight loss guidance and consistent dietary changes.
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.