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
How Weight Loss Without Alcohol Works
Yes, you can lose weight without completely cutting out alcohol — but reducing intake significantly improves results. Alcohol is high in calories, slows fat burning, and can increase appetite, making weight management UK harder. Whether you're aiming for sustainable weight loss or exploring prescription options like GLP-1 medication, understanding alcohol's role helps you achieve better outcomes. Our free BMI calculator can help you track where you stand, and our weight loss projections show how different lifestyle changes affect your goals.
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.
Why Alcohol Affects Weight Loss
Alcohol impacts weight loss in several ways. A single pint of lager contains around 180 calories, wine has 120 calories per glass, and spirits mixed with sugary mixers can exceed 250 calories — equivalent to a full meal without providing satiety. More importantly, alcohol slows fat oxidation (the body's ability to burn fat), as your liver prioritises processing alcohol over burning stored fat.
- Alcohol increases appetite and weakens willpower around food choices
- It causes dehydration, which the body sometimes mistakes for hunger
- Sugary drinks and mixers add hidden calories and blood sugar spikes
- Regular drinking can reduce sleep quality, which disrupts hormones that regulate hunger
For anyone exploring glp-1 weight loss medication like Mounjaro or Wegovy, alcohol also increases nausea risk and may interfere with digestive function. The NHS weight loss guidance acknowledges that even modest alcohol reduction supports better results alongside diet and physical activity.
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.
Practical Strategies for Weight Loss With Occasional Alcohol
You don't need complete abstinence — moderate changes work well. Switch sugary mixers to sugar-free alternatives, choose lower-calorie options like light beers or spirits with water, and limit intake to 1–2 units per occasion rather than daily drinking. Track total weekly units: NHS guidance recommends no more than 14 units per week for sustainable health.
If you're considering prescription weight loss medication, discuss alcohol use with your prescriber. For nhs weight loss or private weight management, reducing alcohol amplifies results. Use our free progress tracker to log both weight changes and lifestyle habits — you'll quickly see how alcohol reduction impacts your journey. Even cutting back moderately (rather than eliminating entirely) often produces noticeable improvements within 4–6 weeks.
- 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 I drink alcohol while taking weight loss injections like Wegovy or Mounjaro?
Alcohol can increase nausea and digestive side effects with GLP-1 medications. Always discuss your alcohol use with your prescriber — they may recommend reducing intake, especially when starting or increasing doses. Moderate amounts are often acceptable once side effects settle, but your individual situation matters.
How many calories does alcohol really add to weight loss?
A standard UK unit (10ml) contains 7 calories, but drinks vary widely: a pint of lager has around 180 calories, wine has 120 per glass, and cocktails often exceed 300. These calories don't trigger fullness signals like food does, making them particularly challenging for weight management. Cutting back even moderately saves significant weekly calories.
Will I lose weight faster if I cut out alcohol completely?
Not necessarily faster, but potentially more sustainably. Complete abstinence isn't required — most people see good results by moderating intake (around 6–8 units weekly rather than none). The key is finding what you can maintain long-term alongside diet and physical activity changes.
Does alcohol affect my BMI measurements or weight loss calculations?
Alcohol doesn't change your actual BMI calculation, but dehydration from drinking can cause temporary water weight changes that obscure real fat loss. For accurate tracking, check your weight at the same time daily, ideally after the same routine, and use our BMI calculator weekly to see genuine progress over time.
What's the best approach if I want to lose weight but drink regularly?
Focus on reducing rather than eliminating. Choose lower-calorie options, limit frequency, and combine with calorie deficit through diet and activity. If you've tried lifestyle changes without results, prescription weight loss medication through NHS weight loss services or private prescribing can help — discuss alcohol habits with your GP or prescriber first.
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.