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
Are Pistachios Healthy For Weight Loss?
Yes, pistachios can be part of a healthy weight loss plan when eaten in moderation. They're high in protein and fibre, which help you feel fuller for longer. However, they're calorie-dense, so portion control matters. For sustainable weight management in the UK, dietary choices like pistachios work best alongside physical activity and, for eligible adults, prescription weight loss medication. Understanding how different foods support your goals is important, but medication options are also available if you need additional support.
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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 Available in the UK
If you're looking to lose weight and improve your weight management, the UK offers several prescription weight loss options alongside dietary changes. Mounjaro (tirzepatide) and Wegovy (semaglutide) are two GLP-1 receptor agonist medications licensed for weight loss medication nhs referral and private prescribing. Saxenda (liraglutide) is also available.
Eligibility typically requires:
- BMI of 30 or above, or 27–29.9 with weight-related health conditions
- Clinical assessment by a prescriber
- Commitment to lifestyle changes alongside medication
In clinical trials, Mounjaro helped participants lose an average of 15–21% of body weight, whilst Wegovy showed approximately 15% average loss. Individual results vary. Calculate your personal bmi weight loss context using our free BMI calculator above to see where you stand against NHS guidelines.
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 — How to Access Weight Loss Support
NHS access: Referral from your GP to a tier 3 specialist weight management service (wait times vary by region). Private access: Online clinical assessment with a UK-licensed prescriber; faster but involves cost (typically £130–£320/month depending on dose).
Start a conversation with your GP about your weight management goals. They can assess whether nhs weight loss services or lose weight uk prescription options suit you. If you're interested in private options, reputable GPhC-registered pharmacies can arrange consultations. Try our free GLP-1 weight loss calculator to explore potential outcomes at different doses—this can be helpful to discuss with your prescriber.
- 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.
Are pistachios actually good for weight loss?
Pistachios contain protein and fibre that support satiety, making them helpful for weight management. However, they're calorie-dense (about 160 kcal per 28g serving), so portion control is essential. They're best enjoyed as a measured snack as part of a calorie-controlled diet, not a weight loss solution on their own.
What's the difference between NHS and private weight loss medication in the UK?
NHS prescription weight loss medications (like Mounjaro or Wegovy) are accessed through referral to specialist services, with potential waiting lists. Private options are available immediately following an online clinical assessment but involve personal cost. Both require prescription and clinical eligibility assessment.
How much weight can I expect to lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% with Mounjaro and approximately 15% with Wegovy, achieved over several months alongside reduced-calorie diet and increased activity. Individual results vary significantly. Medications are tools that support lifestyle changes, not replacements for them.
Am I eligible for prescription weight loss medication in the UK?
Generally, adults with BMI 30+ or BMI 27–29.9 with weight-related health conditions (diabetes, high blood pressure, heart disease) may be eligible. Your GP or a private prescriber can assess your individual situation. Use our free BMI calculator to check your personal BMI, then discuss options with your GP.
Can I get weight loss medication quickly on the NHS?
NHS access involves referral to specialist tier 3 weight management services, which have significant waiting lists in many areas (sometimes months to years). If you need support sooner, private online prescribing is available through GPhC-registered pharmacies, typically within days of consultation.
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.