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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Best Bread for Weight Loss — UK Medication Guide
If you're looking for the best bread for weight loss whilst managing your weight in the UK, prescription weight loss medications may offer additional support alongside dietary changes. Unlike restrictive diets, medications like Mounjaro and Wegovy work by helping reduce appetite and food cravings, making it easier to make healthier choices. This guide explains how prescription weight management works in the UK, who is eligible, and whether NHS or private access might suit 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.
UK-Licensed Weight Loss Medications
Three main prescription options are licensed in the UK for weight management:
- Mounjaro (tirzepatide) — A dual GIP and GLP-1 receptor agonist, injected once weekly. In clinical trials, participants lost an average of 15–21% body weight, though results vary individually.
- Wegovy (semaglutide) — A GLP-1 receptor agonist, injected once weekly. Clinical evidence shows average weight loss of around 15% body weight when combined with lifestyle changes.
- Saxenda (liraglutide) — A GLP-1 injection taken daily, approved for weight management in UK adults.
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. Use our free BMI calculator above to check your current BMI and see if you fall within typical eligibility ranges. All three medications are prescription-only and require a clinical assessment before being prescribed.
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 in the UK
NHS access is through specialist tier 3 weight management services — your GP can refer you, though waiting lists vary significantly by region. Private access is available through UK-licensed online prescribing services; eligible adults can access medication following a remote clinical assessment without an NHS referral.
Whichever route you choose, weight loss medication works best alongside a balanced diet and physical activity. Our GLP-1 weight loss calculator can help you estimate potential outcomes at different doses if you're considering prescription options. Starting conversations with your GP about weight loss options — including both lifestyle support and available medications — is the best next step for personalised, evidence-based guidance.
- 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.
Can I still eat bread if I'm taking weight loss medication?
Yes. Medications like Mounjaro and Wegovy don't ban any foods — they help reduce appetite and cravings, making portion control easier. Many people continue eating bread but in smaller amounts. The key is balanced nutrition alongside reduced overall calories.
What's the difference between Mounjaro and Wegovy?
Mounjaro is a dual GIP/GLP-1 agonist with two hormone pathways; Wegovy is a single GLP-1 agonist. Both are once-weekly injections. Clinical trials show Mounjaro may offer slightly higher average weight loss, but individual results vary. Your prescriber can advise which suits you.
How long do I need to take weight loss medication?
Duration depends on your goals and how your body responds. Some people use it short-term to reach a target, others longer-term for ongoing management. This is discussed with your prescriber. Weight loss is usually maintained through continued healthy habits.
Am I eligible for NHS weight loss medication?
Generally, you need a BMI of 30 or above, or 27–29.9 with a weight-related health condition like diabetes. Eligibility varies by region and NHS availability. Your GP can assess you and refer to specialist services if appropriate.
How quickly will I lose weight on medication?
The NHS recommends sustainable weight loss of 0.5–1kg per week. Prescription medications may help achieve this, but results vary. Clinical trials show average loss of 15–21% body weight over several months, achieved alongside diet and exercise.
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.