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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Do Chia Seeds Help With Weight Loss?
Chia seeds are often promoted as a weight loss superfood, but the scientific evidence is mixed. While chia seeds are nutritious and may support weight management when part of a balanced approach, they are not a weight loss solution on their own. For eligible UK adults, prescription weight loss medications like Mounjaro and Wegovy offer evidence-based support alongside diet and exercise. This guide explores what the research shows about chia seeds and introduces prescription weight management options available through the NHS and private prescribing in the UK.
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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.
UK Prescription Weight Loss Options
If you're looking for effective weight loss medication in the UK, prescription options backed by clinical evidence are available. Mounjaro (tirzepatide) and Wegovy (semaglutide) are GLP-1 receptor agonist injections licensed for weight management in eligible UK adults. In clinical trials, these medications helped participants lose an average of 15–21% of their body weight when combined with a reduced-calorie diet and increased physical activity.
- Mounjaro: Dual GIP and GLP-1 agonist, once-weekly injection, doses from 2.5 mg to 15 mg
- Wegovy: GLP-1 agonist, once-weekly injection, doses from 0.25 mg to 2.4 mg
- Saxenda: GLP-1 agonist, once-daily injection, doses from 0.6 mg to 3 mg
All three are prescription-only medications and require a clinical assessment to determine eligibility. They work by reducing appetite, supporting fuller feelings after meals, and helping regulate blood sugar levels—mechanisms entirely different from dietary supplements like chia seeds.
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 vs Private Weight Loss Medication in the UK
NHS access: Prescription weight loss medications are available through specialist tier 3 and tier 4 weight management services. You'll need a referral from your GP, and availability varies significantly by region and ICB. Waiting lists can be lengthy in many areas, sometimes months or longer.
Private access: You can obtain prescription weight loss medication through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. This route does not require NHS referral and offers quicker access. Costs typically range from £129–£320 per month depending on medication and dose.
Your GP can discuss which route is most appropriate for your circumstances and health profile. Use our free BMI calculator to check your starting point, and our GLP-1 weight loss calculator can help you estimate potential outcomes with prescription medication.
- 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.
Do chia seeds actually help with weight loss?
Chia seeds are high in fibre and may support satiety when consumed with adequate water, potentially helping with portion control. However, scientific evidence for direct weight loss is limited. They are best viewed as a nutritious addition to a balanced diet rather than a standalone weight loss solution. For more substantial, evidence-backed support, prescription medications like Mounjaro and Wegovy show clinical results.
Who is eligible for prescription weight loss medication in the UK?
Adults with a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea) may be eligible. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds. A GP or prescriber will assess your individual eligibility.
How much weight can I expect to lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% of body weight over 68–72 weeks. However, individual results vary significantly. Weight loss is achieved alongside a reduced-calorie diet and increased physical activity. These medications are tools to support weight management, not assures of specific outcomes.
What's the difference between NHS and private weight loss medication access?
NHS access is through specialist weight management services requiring a GP referral, with variable waiting times by region. Private access is through online prescribing without NHS referral, typically faster and costing £129–£320 monthly. Your GP can advise which option suits your situation.
Are chia seeds safe to take alongside prescription weight loss medication?
Chia seeds are generally safe, but always inform your prescriber of all dietary supplements and foods you consume. Some foods can affect how medications work. Your prescriber or pharmacist can advise whether chia seeds interact with your specific medication and dosage.
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.