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
Can Hypnosis Help with Weight Loss — And What Else Works?
Hypnosis for weight loss has limited scientific evidence of sustained results. While some people report modest benefits from therapeutic hypnosis when combined with lifestyle changes, most evidence suggests prescription weight management options are more effective for significant, sustained weight loss. In the UK, prescription medications like Mounjaro and Wegovy are available to eligible adults alongside behavioural support. This guide explores both hypnotherapy and evidence-based alternatives to help you understand your weight management options.
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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 Prescription Weight Loss Options
If you're exploring weight management in the UK, prescription medications have stronger clinical evidence than hypnosis alone. The main prescription weight loss injections available are:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist. Clinical trials showed average weight loss of 15–21% of body weight at the highest dose, alongside reduced-calorie diet and increased physical activity.
- Wegovy (semaglutide) — a GLP-1 receptor agonist. Clinical trials showed average weight loss of approximately 15% of body weight on the maximum dose.
- Saxenda (liraglutide) — a daily GLP-1 injection. Evidence supports modest weight loss for eligible patients.
All are prescription-only and require a clinical assessment to determine eligibility. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and our BMI calculator to check your starting point.
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 Access vs Private — How to Start
In the UK, prescription weight loss medication is available through two routes. NHS access requires referral to a specialist tier 3 weight management service from your GP — availability varies significantly by region and waiting times can be lengthy. Private access is available through online consultations with UK-licensed prescribers; if appropriate, medication is dispensed by a registered pharmacy.
To find out if you're eligible, speak to your GP or arrange a private consultation. Eligibility typically requires a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. Track your weight loss progress using our free progress tracker once you start treatment.
- 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 hypnotherapy actually work for weight loss?
Hypnotherapy may help some people when combined with lifestyle changes, but evidence of sustained weight loss is limited. Studies show mixed results, and long-term effectiveness remains unclear. For more significant weight loss, prescription medications with strong clinical evidence may be more effective alongside behavioural support.
Are prescription weight loss injections like Mounjaro available on the NHS in the UK?
Yes, Mounjaro and other weight loss injections are available on the NHS through specialist tier 3 weight management services. However, access varies by region and waiting lists can be very long. Private access is also available through online consultations with UK-licensed prescribers.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are once-weekly injections. Mounjaro is a dual GIP and GLP-1 agonist with slightly higher average weight loss (15–21%) compared to Wegovy, which is a GLP-1 agonist only (average 15%). Individual results vary significantly, and choice depends on clinical assessment and individual factors.
How do I know if I'm eligible for prescription weight loss medication in the UK?
Typically, adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, may be eligible. Your GP can assess you, or you can arrange a private consultation. Use our free BMI calculator to check your starting point and discuss options with a healthcare professional.
Can I use prescription weight loss injections alongside other approaches like therapy or dietary changes?
Yes. Prescription weight loss medications work best alongside reduced-calorie diet and increased physical activity, and many people benefit from behavioural support or therapy. Talk to your prescriber about combining approaches for the best results for your weight management journey.
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.