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
Great Foods for Weight Loss in the UK
Eating the right foods is one of the most important parts of sustainable weight loss in the UK. A balanced diet based around whole foods—vegetables, lean proteins, fruits, and whole grains—helps create a calorie deficit whilst keeping you satisfied. For many people, combining dietary changes with prescription weight loss medication can boost results. This guide covers the foods that support weight management, and how UK-licensed weight loss options like Mounjaro and Wegovy work alongside good nutrition.
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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.
Best Foods for Weight Loss and Prescription Medication Options
Nutrient-dense foods that support weight management in the UK include:
- Lean proteins: chicken, fish, eggs, and legumes help you feel fuller for longer and preserve muscle during weight loss
- Vegetables: leafy greens, broccoli, and peppers are low in calories but high in fibre and nutrients
- Whole grains: oats, brown rice, and wholemeal bread provide sustained energy and satiety
- Healthy fats: olive oil, nuts, and avocados support hormone balance and nutrient absorption
For adults seeking additional support, GLP-1 weight loss medication such as Mounjaro and Wegovy are prescription-only options available in the UK. These work by helping regulate appetite and food cravings, making it easier to stick to a healthy diet. Clinical trials showed that when combined with dietary changes and increased physical activity, these medications can help with meaningful weight reduction. However, food choices remain the foundation—medication supports your efforts, it doesn't replace them.
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.
NHS Weight Loss Support and Prescription Eligibility in the UK
The NHS offers free weight management support through its nhs weight loss pathway, starting with Tier 1 community programmes and digital tools. If you have a BMI of 30 or above, or 27 or above with weight-related health conditions, you may be eligible for prescription weight loss medication through specialist NHS services.
Private options are also available—prescription weight loss injections can be accessed through registered online clinics following a clinical assessment. Your GP can discuss whether medication is right for your circumstances. You can calculate your personal BMI using our free BMI calculator above to understand where you stand, and use our GLP-1 weight loss calculator to see projected outcomes if you're considering prescription options.
- 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 are the best foods to eat when losing weight?
Focus on lean proteins (chicken, fish, eggs), vegetables (broccoli, leafy greens, peppers), whole grains, and healthy fats (olive oil, nuts). These foods are nutrient-dense, support satiety, and help maintain muscle during weight loss. Avoid highly processed foods, sugary drinks, and excessive snacking.
How does prescription weight loss medication work with diet?
GLP-1 medications like Mounjaro and Wegovy regulate appetite and help you feel fuller after smaller meals, making it easier to maintain a healthy diet. They work alongside—not instead of—good nutrition and physical activity. Clinical evidence shows best results when combined with dietary changes.
Am I eligible for weight loss medication on the NHS in the UK?
You may be eligible if you have a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes or high blood pressure. Eligibility is assessed through NHS specialist weight management services. Your GP can discuss whether you might qualify.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are prescription-only GLP-1-based medications available in the UK. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist. Clinical trials showed both support weight loss when combined with diet and exercise. A prescriber will assess which is suitable for you.
How can I find out if I'm eligible for prescription weight loss treatment?
Speak to your GP, who can assess your BMI and medical history. You can calculate your BMI instantly using our free BMI calculator above. Your GP can then refer you to NHS specialist services or discuss private prescription options if appropriate for your circumstances.
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.