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
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No Alcohol For 2 Weeks: Weight Loss Impact & UK Options
Removing alcohol for two weeks can be an effective short-term step towards weight loss, particularly when combined with other lifestyle changes. Alcohol is energy-dense—a standard drink contains 100–200 calories with minimal nutritional value—so eliminating it creates a calorie deficit. However, sustainable weight management often requires longer-term approaches. If you're exploring weight loss strategies, it's worth understanding both lifestyle modifications and prescription weight loss options available through the NHS or private prescribing in the UK.
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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 Two Weeks Without Alcohol Affects Weight Loss
A two-week alcohol break removes a significant source of empty calories from your diet. A 175ml glass of wine contains roughly 160 calories; a pint of lager around 180 calories. Over two weeks, eliminating daily drinking could create a 1,120–1,400 calorie deficit, potentially resulting in weight loss of 0.5–1 kg depending on baseline intake.
Additional benefits beyond calorie reduction:
- Improved sleep quality—alcohol disrupts sleep architecture, affecting hunger hormones and metabolism
- Reduced water retention—alcohol causes dehydration and bloating
- Better food choices—alcohol lowers inhibitions and increases appetite, particularly for high-calorie foods
- Improved digestion—alcohol irritates the gut and slows gastric emptying
However, two weeks is a short timeframe. For sustained weight management in the UK, GPs recommend combining lifestyle changes with longer-term commitment or, where appropriate, prescription weight loss support.
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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.
Prescription Weight Management Options in the UK
If you're looking for longer-term weight management support, several prescription options are available in the UK. Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide) are licensed for weight management in eligible adults. These GLP-1 and dual GIP/GLP-1 medications work alongside reduced-calorie diets to help regulate appetite and support sustainable weight loss.
UK eligibility: You may be eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Access is available through NHS specialist weight management services or private prescribing following clinical assessment. Your GP can discuss which option suits your circumstances.
- 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 giving up alcohol for 2 weeks cause weight loss?
Possibly. Alcohol is calorie-dense, so removing it creates a deficit. However, weight loss depends on total calorie intake and other factors. A 2–3 lb loss is realistic for some people over two weeks, but individual results vary significantly. For sustained weight management beyond two weeks, a structured approach works better.
What's the best way to measure progress if I cut alcohol for 2 weeks?
Track your weight weekly at the same time of day, ideally on the same day each week. Use our free weight converter to track changes consistently in kg, stone, or lbs. Also monitor how you feel—energy levels, sleep quality, and mood often improve. Our progress tracker can help you log these changes alongside your weight.
Is cutting alcohol alone enough for long-term weight loss?
No. Two-week alcohol breaks can jump-start weight loss, but sustainable weight management requires longer-term lifestyle changes: consistent calorie deficit, regular physical activity, and balanced nutrition. Your GP can discuss whether prescription weight loss medication might help, particularly if you have a BMI of 27 or above with health complications.
What prescription weight loss options are available on the NHS in the UK?
Mounjaro, Wegovy, and Saxenda are NHS-licensed for eligible adults. Access is through tier 3 specialist weight management services, typically following GP referral. Availability varies by region. Private prescribing options are also available following online clinical assessment. Check your eligibility using our free BMI calculator first.
Can I use prescription weight loss medication alongside alcohol consumption?
Prescription weight loss medications like Mounjaro and Wegovy can be used with alcohol, but alcohol adds empty calories that undermine weight loss efforts. Your prescriber will discuss any specific interactions during your clinical assessment. For best results, combining medication with reduced alcohol intake and dietary changes is most effective.
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.