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
Is Corn Good for Weight Loss?
Corn can be part of a healthy diet, but it's not a weight loss food on its own. While corn contains fibre and nutrients, it's relatively high in calories and carbohydrates compared to other vegetables. For sustainable weight management in the UK, most people combine dietary choices with physical activity. If you're overweight or obese, your GP may discuss prescription weight loss medication with you — particularly if you have weight-related health conditions. Use our free BMI calculator above to check your current weight status and see what options might be available to you.
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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.
Prescription Weight Loss Options in the UK
If you're looking for weight management support beyond dietary changes, prescription weight loss medications are available in the UK for eligible adults. The main options are:
- Mounjaro (tirzepatide) — a once-weekly GLP-1 injection that may help reduce appetite and support feeling fuller after meals. Clinical trials showed participants lost an average of 15–21% of their body weight alongside a reduced-calorie diet and increased physical activity.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection with an average weight loss of around 15% of body weight in trials.
- Saxenda (liraglutide) — a daily GLP-1 injection option.
All three are prescription-only medicines that require a clinical assessment before being prescribed. Try our GLP-1 weight loss calculator to estimate potential results at different doses if you're considering medication.
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 Eligibility and How to Get Started
In the UK, you may be eligible for prescription weight loss treatment if you have a BMI of 30 or above, or a BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or heart disease.
Access is available through two routes: the NHS (via your GP and specialist weight management services, though waiting lists vary by region) and private prescribing (through online clinical assessments with UK-licensed prescribers). Whichever route you choose, a qualified healthcare professional will assess whether medication is suitable for your individual health. Start by speaking to your GP about your weight management goals — they can advise on what's available in your area and whether prescription treatment is appropriate for you.
- 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.
Is corn a healthy food for weight loss?
Corn contains fibre and nutrients, making it healthier than many processed foods. However, it's relatively high in calories and carbohydrates for a vegetable, so portion control matters. It can be part of a balanced diet, but it's not a weight loss food on its own. Sustainable weight loss requires overall calorie intake and physical activity.
What prescription weight loss options are available on the NHS in the UK?
Mounjaro, Wegovy, and Saxenda are all licensed for weight management on the NHS. Access is through specialist tier 3 weight management services, usually via GP referral. Availability and waiting times vary by region and local NHS commissioning. Your GP can advise what's available in your area.
How much weight can I expect to lose with GLP-1 medication?
Clinical trials show average weight loss of 14–21% of body weight, depending on the medication and dose. Individual results vary significantly. Weight loss medications work best alongside a reduced-calorie diet and increased physical activity. Not everyone experiences the same results.
Can I get weight loss injections through my GP?
Access depends on your local NHS services. Specialist weight management services can prescribe Mounjaro and Wegovy, but you'll need a GP referral and assessment. Alternatively, private online prescribing services can issue prescriptions following a clinical consultation. Both routes require a prescription from a licensed UK prescriber.
What should I do if I'm interested in weight loss medication?
Start by speaking to your GP about your weight management goals and health history. They can assess your BMI, discuss any weight-related health conditions, and advise on NHS options in your area. You can also explore private prescribing services online if NHS waiting times are lengthy. Use our BMI calculator to understand your current weight status before your appointment.
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.