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 Alcohol Affects Your Weight Loss Journey
Alcohol can significantly impact weight loss progress, even when you're following a reduced-calorie diet or taking prescription weight loss medication. Understanding how alcohol interacts with your body's weight management systems is essential for sustainable results. Whether you're managing your weight through lifestyle changes alone or considering prescription weight loss UK options, knowing the facts about alcohol consumption will help you make informed choices that support your health 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 adds calories without nutritional benefit. A standard 175ml glass of wine contains approximately 130 calories, a pint of beer around 180 calories, and spirits mixed with sugary mixers can exceed 200 calories per drink. Over a week, regular alcohol consumption can add 500–1000+ extra calories, offsetting the calorie deficit needed for weight loss.
Alcohol impacts metabolism and fat burning. When you drink alcohol, your body prioritises metabolising it over fat and carbohydrates. This means your body temporarily stops breaking down stored fat, slowing weight loss progress. Alcohol also increases appetite and reduces inhibition around food choices, making overeating more likely.
Alcohol affects GLP-1 and hunger hormones. If you're using prescription weight loss medication like Wegovy or considering GLP-1 weight loss options, alcohol can interfere with the medication's appetite-suppressing effects. Alcohol stimulates ghrelin (the hunger hormone) and may reduce the effectiveness of weight management medication.
- Alcohol is metabolised as a priority fuel source
- It provides 7 calories per gram (nearly as much as fat at 9 calories)
- Regular drinking can increase overall calorie intake by 15–20%
- Alcohol consumption is linked to weight gain around the midsection
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.
Alcohol and Weight Loss Medication
If you're taking prescription weight loss medication such as Mounjaro or Wegovy, alcohol consumption requires careful consideration. These GLP-1 and GIP/GLP-1 medications work by regulating appetite and slowing gastric emptying. Alcohol can interact with these effects and may increase side effects like nausea or dizziness.
Most prescribers recommend minimising alcohol or avoiding it entirely during the first weeks of treatment whilst your body adjusts. Your GP or prescriber can give you personalised guidance based on your weight loss goals and medical history. Use our free GLP-1 weight loss calculator to understand how prescription medication might support your weight management UK journey, and discuss alcohol consumption as part of your overall plan.
- Alcohol may reduce medication effectiveness
- It can increase gastrointestinal side effects
- Discuss alcohol limits with your prescriber before starting treatment
- 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.
How many calories does alcohol add to my weight loss plan?
A single alcoholic drink contains 100–250 calories depending on type. Regular drinking (3–4 drinks per week) can add 400–1000 calories weekly, significantly impacting weight loss. To put this in context, a calorie deficit of around 500 kcal per day is needed for sustainable 0.5kg weekly weight loss. Alcohol can easily undermine this target.
Can I drink alcohol whilst taking Wegovy or Mounjaro?
Most prescribers advise minimising or avoiding alcohol during the initial treatment phase. Alcohol may reduce medication effectiveness and increase side effects like nausea. Always discuss your alcohol consumption with your GP or prescriber before starting prescription weight loss medication. Individual guidance varies based on your health profile.
What type of alcohol has the fewest calories?
Spirits with sugar-free mixers (vodka and soda water) contain around 60–90 calories per serve. Dry wines have approximately 100–130 calories per 175ml glass. Beer and sweet cocktails are higher in calories. However, even "lower calorie" options add up over time and can impact weight loss progress.
Does alcohol prevent weight loss completely?
Alcohol doesn't prevent weight loss entirely, but it significantly slows progress. If your total calorie intake remains in deficit, you will still lose weight—just more slowly. However, alcohol's effect on appetite hormones and metabolism makes maintaining a deficit harder. Reducing or eliminating alcohol speeds up weight loss considerably.
Should I use the BMI calculator to check my weight loss progress if I drink regularly?
Yes, track your progress regardless. Calculate your BMI using our free BMI calculator regularly to monitor how your weight changes over time. If you're drinking alcohol regularly, you may notice slower progress than expected. This can help motivate you to adjust alcohol consumption if weight loss is your goal.
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.