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
Hypnosis and Weight Loss — What Works in the UK
Hypnosis is sometimes promoted as a weight loss tool, but evidence for its effectiveness is limited and inconsistent. If you're struggling with weight management in the UK, there are evidence-based alternatives available. Prescription medications like Mounjaro and Wegovy have strong clinical support, and many adults qualify for NHS weight loss support or private prescription options. This guide explains what the evidence actually shows about hypnosis, and introduces the medication and lifestyle approaches that have proven results.
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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.
UK-Licensed Weight Loss Medications and Evidence
If hypnosis hasn't worked for you, or you want evidence-based support for weight management in the UK, prescription options are available. Mounjaro (tirzepatide) and Wegovy (semaglutide) are dual or single GLP-1 receptor agonists licensed for weight management in UK adults. Clinical trials show these medications help participants lose an average of 15–21% of body weight alongside a reduced-calorie diet and increased physical activity — though individual results vary.
Eligibility includes adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. Both require a prescription following a clinical assessment. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, and calculate your BMI now using the BMI calculator on this page to check if you may be eligible.
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 Access — How to Get Started
NHS access: Referral to a tier 3 specialist weight management service through your GP. Availability and waiting times vary significantly by region (ICB). Once referred, a clinician will assess your eligibility and discuss prescription options.
Private access: Available through GPhC-registered online pharmacies following a remote consultation with a UK-licensed prescriber. No NHS referral needed. Costs typically range from £130–£320 per month depending on dose.
Your first step is a conversation with your GP about your weight loss goals and any health conditions. They can advise whether NHS specialist services are available in your area, or discuss whether private prescription options are 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.
Does hypnosis actually work for weight loss?
Evidence is weak and inconsistent. Small studies show mixed results, and weight loss from hypnosis alone is typically modest. The NHS does not routinely recommend hypnosis as a primary weight loss treatment. Prescription medications like Mounjaro and Wegovy have far stronger clinical evidence and can achieve 15–clinically studied weight loss on average.
What's the difference between Mounjaro and Wegovy?
Both are once-weekly injections licensed for weight management in the UK. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) activates GLP-1 only. Mounjaro has slightly higher average weight loss in trials (19.5–20.9% vs approximately 15%), but both are effective. A prescriber will assess which suits you best.
Am I eligible for weight loss medication on the NHS?
Generally, yes, if you have a BMI of 30 or above, or 27–29.9 with a weight-related condition (diabetes, high blood pressure, sleep apnoea). Access is through tier 3 specialist services, so ask your GP for a referral. Availability varies by region and waiting times can be long.
How much weight can I expect to lose with Mounjaro or Wegovy?
Clinical trials show average weight loss of 15–21% of body weight over 68–72 weeks, alongside diet and exercise. Individual results vary significantly. Use our free weight loss calculator to see projected outcomes at different doses, but remember these are estimates — your result depends on your personal response and lifestyle changes.
Can I get weight loss injections privately without seeing my GP?
Yes. You can access private prescriptions through GPhC-registered online services following a remote clinical assessment. No NHS referral is needed. However, it's still recommended to inform your GP about any medication you're taking, especially if you have existing health conditions or take other medicines.
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.