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
Fat Reduction — Effective Methods and UK Health Support
Fat reduction is a key health goal for many UK adults, and there are several evidence-based approaches available. Whether through lifestyle changes, prescription medications, or a combination of methods, understanding your options helps you make informed decisions about your health. This guide covers practical fat reduction strategies aligned with NHS guidance, including how GLP-1 medications like Wegovy may support weight management efforts alongside dietary and physical activity changes.
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.
Evidence-Based Fat Reduction Methods
The most effective fat reduction combines a calorie deficit with increased physical activity. The NHS recommends losing weight at a rate of 0.5 to 1 kg per week for sustainable results. You can create a calorie deficit through dietary changes—typically reducing intake by around 500 kcal per day supports approximately 0.5 kg weekly loss. This NHS health advice applies across different dietary approaches, whether Mediterranean diet, low-carbohydrate options, or intermittent fasting.
- Dietary approaches: Focus on whole foods, reduce processed items, increase protein and fibre
- Physical activity: Aim for 150 minutes moderate activity weekly plus strength training
- Behavioural support: NHS-funded weight management programmes in your area may offer group or one-to-one support
For adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, prescription weight loss medications may be an option to support fat reduction efforts alongside lifestyle changes. Wegovy (semaglutide) is a once-weekly GLP-1 injection licensed in the UK that clinical trials showed helped participants lose an average of approximately 15% of body weight—though individual results vary significantly.
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.
Fat Reduction and Healthy Weight in UK Context
Understanding your starting point helps track fat reduction progress effectively. Use our free BMI calculator to assess your current weight status against NHS guidelines. A healthy BMI range for UK adults is 18.5 to 24.9, though thresholds differ for adults of South Asian, Chinese, Black African, or Black Caribbean heritage.
Fat reduction success depends on consistency rather than speed. The healthiest approach involves sustainable changes you can maintain long-term. Your GP can provide personalised guidance on appropriate fat reduction strategies for your circumstances, discuss prescription weight management options if suitable, and refer you to specialist services if needed. Tracking progress with our free progress tracker helps maintain motivation over weeks and months of gradual, sustainable fat reduction.
- 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.
What is the difference between fat loss and weight loss?
Weight loss includes fat, muscle, and water loss. Fat reduction specifically targets body fat. Resistance training during weight loss helps preserve muscle, meaning more of your weight reduction comes from fat. This is why both diet and exercise matter for effective fat reduction rather than diet alone.
How quickly can I reduce body fat?
Safe fat reduction occurs at approximately 0.5 to 1 kg per week, as recommended by the NHS. Faster loss may result in muscle loss alongside fat loss. Very rapid fat reduction (over 1.5 kg weekly) is not recommended without medical supervision, as it can affect health negatively.
Can prescription medications help with fat reduction?
Yes, GLP-1 medications like Wegovy may support fat reduction when prescribed appropriately. These are prescription-only medicines requiring clinical assessment and are used alongside dietary changes and increased physical activity. Your GP or a licensed prescriber can assess whether this option suits your individual circumstances.
Does exercise burn fat faster than diet alone?
Research shows diet is generally more important for weight loss, but combining diet with exercise produces the best fat reduction results. Exercise also preserves muscle mass, improves health markers like blood pressure, and supports long-term weight management sustainability better than diet changes alone.
What role does metabolism play in fat reduction?
Metabolism affects how many calories you burn daily. However, sustainable fat reduction relies primarily on creating a calorie deficit through diet and activity rather than "boosting metabolism." Building muscle through resistance training does increase daily calorie burn slightly, supporting fat reduction efforts over time.
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.