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
Alcohol and Weight Loss — What You Need to Know
The simple answer is that alcohol makes weight loss harder, not easier. There is no "good" alcohol for weight loss in the sense that any alcoholic drink will slow your progress because alcohol is calorie-dense and doesn't support weight management. However, if you do choose to drink, some options are lower in calories than others. This guide explains how alcohol affects weight loss, which drinks have fewer calories, and how to balance drinking with your weight management goals in the UK.
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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.
How Alcohol Affects Weight Loss and Metabolism
Alcohol presents several challenges for weight loss. Firstly, it's highly calorie-dense — ethanol contains approximately 7 calories per gram, nearly twice that of carbohydrates or protein. A single pint of lager contains around 180–250 calories, while a large glass of wine can exceed 200 calories. These calories add up quickly and make maintaining a calorie deficit harder.
Secondly, alcohol affects how your body processes food. When you drink, your liver prioritises metabolising alcohol over other nutrients, temporarily slowing fat burning. Alcohol also increases appetite and reduces inhibition, making it easier to overeat. For people using weight loss injections like Mounjaro or Wegovy, alcohol can increase nausea and other side effects, and may interfere with the medication's effectiveness. NHS weight loss guidance consistently recommends limiting alcohol as part of any successful weight management programme.
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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.
Lower-Calorie Alcohol Options (If You Choose to Drink)
If you're pursuing weight management in the UK and want to drink occasionally, some options are less calorie-dense than others. Light beers and low-alcohol lagers contain around 80–120 calories per pint. Dry wines (red or white) contain approximately 120–150 calories per 175ml glass. Spirits with sugar-free mixers — such as gin with diet tonic or vodka with soda water — contain only 60–70 calories per measure.
By contrast, regular lager or ale averages 180+ calories per pint, sweet wines exceed 160 calories, and sugary cocktails or alcopops can contain 200–400 calories. Avoid mixers with added sugar. Use our free BMI calculator and progress tracker to monitor how your weight management is progressing, especially if you're including occasional alcohol in your routine.
- 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 there any alcohol that doesn't affect weight loss?
No. All alcoholic drinks contain calories and affect your body's ability to burn fat. However, choosing lower-calorie options — like dry wine, light beer, or spirits with sugar-free mixers — means fewer calories consumed overall, making it easier to maintain your weight loss goals.
Can I drink alcohol while taking Mounjaro or Wegovy?
Yes, but with caution. Alcohol may increase nausea and other side effects of these medications. It can also slow weight loss progress. Always check with your prescriber or GP about safe alcohol consumption while taking prescription weight loss medication. Drinking within NHS guidelines is safest.
What does the NHS say about alcohol and weight loss?
The NHS recommends limiting alcohol as part of weight management, as it adds empty calories and can increase appetite. UK guidelines suggest a maximum of 14 units per week for adults, spread across several days. For weight loss, lower intake is generally preferable.
How many calories are in different drinks?
A pint of standard lager: ~180–220 calories. A 175ml glass of dry wine: ~120–150 calories. A 25ml measure of spirits with diet mixer: ~60–70 calories. A sugary cocktail: 200–400+ calories. Choosing lower-calorie options helps maintain your calorie deficit.
Should I completely avoid alcohol while losing weight?
Complete avoidance isn't necessary for most people, but limiting alcohol significantly improves weight loss results. If you choose to drink, do so occasionally and in moderation, choose lower-calorie options, and factor the calories into your daily intake. Use our free progress tracker to monitor whether occasional drinking affects your weight loss trajectory.
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.