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 Are the Best Weight Loss Drinks?
When it comes to weight management in the UK, what you drink matters as much as what you eat. Water, green tea, black coffee, and herbal infusions are among the most effective weight loss drinks because they contain few or no calories whilst supporting hydration and metabolism. Unlike sugary soft drinks or high-calorie alternatives, these beverages fit easily into a reduced-calorie diet and can help you feel fuller between meals. Combined with balanced nutrition and increased physical activity, the right drink choices support sustainable weight loss. Your GP can advise on a personalised approach to nhs weight loss that works for your lifestyle.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Water and Hydration — The Foundation of Weight Loss
Water is the single most effective weight loss drink and forms the foundation of any successful weight management strategy. Drinking adequate water (typically 6–8 glasses per day, or roughly 1.5–2 litres) supports several weight loss mechanisms: it increases satiety, helping you feel fuller and eat less; it supports kidney function during weight loss; and it has zero calories. Some evidence suggests drinking water before meals may help reduce overall calorie intake. Herbal teas (such as camomile, peppermint, or ginger) and black tea are also calorie-free or near-calorie-free alternatives that add flavour without undermining your weight management efforts. Avoid adding sugar, honey, or high-calorie milk to any beverage—these additions quickly add 50–150 extra calories per drink. Use our free BMI calculator to track how your weight management journey is progressing, and remember that consistent hydration supports every aspect of weight loss.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 Limit or Avoid for Effective Weight Loss
Sugary soft drinks, energy drinks, flavoured coffees, and sweetened juices are significant obstacles to weight loss because a single serving can contain 150–300+ calories and 30–60g of sugar—equivalent to multiple meals' worth of energy. Even "diet" soft drinks, whilst calorie-free, may trigger cravings and don't provide the metabolic support of water or tea. Alcohol is also high in calories: a standard glass of wine contains 100–150 calories, beer 150–200 calories, and spirits mixed drinks 200–400+ calories. If you're pursuing nhs weight loss or considering prescription weight loss medication, reducing or eliminating these high-calorie drinks is essential. Our progress tracker can help you monitor your daily hydration and drink choices alongside your weight loss journey. Small, consistent changes to what you drink compound into significant, sustainable results.
- 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 really help with weight loss?
Green tea contains caffeine and catechins, compounds that may modestly support fat oxidation and metabolism. Research shows a very small calorie-burning effect, but it's not substantial on its own. Green tea is beneficial mainly because it's a low-calorie, hydrating alternative to sugary drinks. Combined with a calorie deficit and regular activity, it supports weight management—but it's not a weight loss solution by itself.
Is coffee a good weight loss drink?
Black coffee (unsweetened) is excellent for weight management—it's virtually calorie-free and caffeine may slightly boost metabolism and reduce appetite. However, adding sugar, syrups, or high-calorie milk transforms coffee into a high-calorie beverage that works against weight loss. For best results, drink coffee black or with a splash of unsweetened plant-based or dairy milk. Limit to 3–4 cups daily.
What about protein shakes for weight loss?
High-protein drinks can support weight loss when used as meal replacements or snacks because protein increases satiety and helps preserve muscle during weight loss. However, many commercial protein shakes contain 150–300+ calories and added sugars. Choose shakes with at least 15–20g protein, under 200 calories, and minimal added sugar. Use them as part of a structured weight management plan, not as a supplement to regular meals.
Should I drink diet fizzy drinks for weight loss?
Diet soft drinks have zero calories and won't directly increase weight, but they may not support weight loss either. Some research suggests artificial sweeteners can trigger cravings for sweet foods, potentially leading to overeating. Water, tea, and coffee are better choices. If you enjoy fizzy drinks, occasional diet versions are acceptable, but they shouldn't replace water as your primary beverage.
How do weight loss drinks compare to prescription weight loss medication?
Drinks support weight loss through hydration and calorie reduction, but prescription medications like GLP-1 injections work through different mechanisms—reducing appetite and supporting feeling fuller after meals. Our GLP-1 weight loss calculator can help estimate potential outcomes with medication alongside lifestyle changes. Drinks are free, accessible tools; medication requires a prescription and clinical assessment from your GP or a licensed prescriber.
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.