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
Can Cutting Alcohol For 2 Weeks Help You Lose Weight?
Removing alcohol for 2 weeks can support weight loss, but the results depend on how much you were drinking and your overall calorie intake. Alcohol contains 7 calories per gram—almost as much as fat—which adds up quickly. During this 2-week period, you may notice reduced bloating, better hydration, and a lower daily calorie count. However, sustainable weight management UK approaches focus on long-term lifestyle changes rather than short-term elimination. If you're serious about weight loss, tracking your progress and understanding your personal calorie needs can make a real difference.
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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.
How Alcohol Affects Weight Loss
Alcohol has a significant impact on weight for several reasons. Each gram of pure alcohol contains approximately 7 calories—almost double the calorie density of carbohydrates and protein (4 calories per gram). A standard 175ml glass of wine contains around 130 calories, a pint of lager around 180 calories, and spirits with mixers can exceed 200 calories depending on what they're mixed with.
- Empty calories: Alcohol provides calories without nutritional benefit, so your body can't use them effectively
- Appetite stimulation: Alcohol lowers inhibitions around food choices, often leading to higher calorie intake at meals
- Slower metabolism: Your liver prioritises processing alcohol over fat burning, temporarily slowing your metabolic rate
- Dehydration and bloating: Alcohol dehydrates the body, which can cause water retention and bloating
Removing alcohol for 2 weeks eliminates these calories and effects, potentially creating a meaningful calorie deficit if you're not replacing those calories with other foods.
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.
What Results Can You Realistically Expect?
During a 2-week alcohol-free period, you may notice initial weight loss of 1–2 kg (2–4 lbs), though much of this is often water weight rather than fat loss. The actual fat loss depends entirely on whether you maintain a calorie deficit overall. If you were drinking 2–3 alcoholic drinks daily (equivalent to 300–600 extra calories), cutting them out could result in approximately 0.5 kg (1 lb) of fat loss per week—aligned with NHS weight loss guidance.
After 2 weeks, sustainable weight management requires ongoing changes to diet and physical activity. Many people find that continuing to reduce alcohol—not necessarily eliminating it entirely—supports better long-term weight loss outcomes. Tools like our free BMI calculator can help you track where you stand, while our weight loss calculator gives you realistic projections for sustained 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.
Will I definitely lose weight if I don't drink alcohol for 2 weeks?
Weight loss depends on your total calorie intake, not alcohol alone. If you cut alcohol but eat more food to compensate, you may not lose weight. However, if you maintain a calorie deficit and remove alcohol, you're likely to see some weight loss—initially water weight, then fat loss over time.
How many calories does alcohol actually contain?
Alcohol contains 7 calories per gram. A standard 175ml glass of wine has around 130 calories, a pint of beer around 180 calories, and spirits with mixers can exceed 200 calories. These add up quickly and often sit alongside food calories rather than replacing them.
Is giving up alcohol the best way to lose weight?
Giving up alcohol can help if you drink heavily, but it's not the most important factor for most people. Sustainable weight loss comes from maintaining a calorie deficit through balanced eating and physical activity. Moderate alcohol reduction—rather than complete elimination—often works better for long-term adherence.
Will the weight come back after 2 weeks if I start drinking again?
If you return to previous drinking habits and calorie intake, yes, the weight will likely return. Sustainable weight management requires ongoing lifestyle changes, not short-term abstinence. Focus on finding a balanced approach to alcohol and nutrition that you can maintain long-term.
Should I avoid alcohol if I'm taking weight loss medication like GLP-1 injections?
Your prescriber should advise you on alcohol consumption while taking weight loss medication like Mounjaro or Wegovy. Some people find alcohol increases nausea or other side effects. Always discuss alcohol use with your GP or the healthcare professional managing your treatment before making 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.