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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Ramadan and Weight Loss — A UK Health Guide
Ramadan presents unique challenges for weight management due to changed eating patterns and fasting hours. Many UK Muslims wonder whether Ramadan will affect their weight loss goals or progress with weight management programmes. The good news is that with proper planning, you can maintain healthy eating habits and continue progressing towards your NHS weight loss targets during this important month. This guide covers practical strategies aligned with UK health guidelines to help you balance your spiritual observance with your health goals.
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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 Fasting During Ramadan Affects Your Weight
During Ramadan, Muslims fast from sunrise to sunset (suhoor to iftar), which fundamentally changes eating patterns. The fasting period itself can range from 12 to 18 hours depending on your UK location and the time of year. Contrary to common assumptions, fasting does not automatically cause weight loss — the impact on your weight depends entirely on what you consume during non-fasting hours.
- Total calorie intake over 24 hours determines weight loss, not the timing of meals
- Many people gain weight during Ramadan due to increased consumption of high-calorie foods at iftar (breaking the fast) and suhoor (pre-dawn meal)
- Dehydration during fasting can be mistaken for hunger, leading to overeating when you break the fast
- Regular eating patterns resume after Ramadan — consistency matters more than any single month's pattern
If you're using prescription weight management tools or following an NHS weight loss programme, Ramadan should not derail your progress if you plan ahead.
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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.
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Maintaining Weight Loss Goals During Ramadan
Plan your suhoor and iftar meals carefully to maintain a healthy calorie intake for UK weight loss. Include protein and fibre at both meals to help you feel full and manage energy levels during the fast. Staying hydrated in non-fasting hours is essential — aim for at least 2–3 litres of water between iftar and suhoor.
- Choose whole grains, lean proteins (chicken, fish, lentils), and vegetables over fried or sugary foods
- Avoid excessive dates and sweet drinks — these are calorie-dense and spike blood sugar quickly
- Use our free progress tracker to monitor your weight throughout Ramadan and stay accountable
- If taking prescription weight loss medication, discuss timing adjustments with your prescriber before Ramadan begins
Moderate physical activity during non-fasting hours helps maintain weight loss momentum — light exercise after iftar is often easier than fasting while exercising.
- 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 gain weight during Ramadan?
Weight change during Ramadan depends on total calorie intake, not fasting itself. Many people gain weight because iftar meals are high in calories and fried foods. However, with mindful eating and portion control, you can maintain or lose weight. Calculate your healthy weight range using our free BMI calculator to understand your personal targets.
Can I continue my weight loss medication during Ramadan?
Yes, but discuss timing with your prescriber beforehand. If you take prescription weight loss medication or other medications, your GP or prescriber can advise whether dosing times need adjusting around fasting hours. Never stop medication without medical guidance — your healthcare provider may suggest alternatives or adjusted schedules.
Is intermittent fasting the same as Ramadan fasting?
Ramadan fasting is a religious practice with spiritual significance, not a weight loss tool. While both involve fasting periods, Ramadan fasting is typically longer, more structured, and includes spiritual elements. From a weight loss perspective, what matters is total calorie intake over 24 hours — the same principle applies to any eating pattern.
What should I eat to break my fast healthily?
Break your fast with hydrating foods and drinks first — water, warm broths, and dates are traditional and sensible. Follow with balanced meals containing lean protein (grilled chicken, fish, beans), vegetables, and whole grains. Avoid large quantities of fried, sugary, or processed foods, which are calorie-dense and can leave you uncomfortably full or sluggish.
Should I exercise during Ramadan?
Light to moderate activity during non-fasting hours is safe and beneficial for weight management. Avoid intense exercise while fasting to prevent dizziness or dehydration. Walking, yoga, or light strength training after iftar can help maintain muscle mass and support your NHS weight loss goals without overexerting yourself during the fast.
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.