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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Wheat Free Diet and Weight Loss — UK Options
A wheat free diet may help some people lose weight, though scientific evidence for wheat elimination specifically is limited. For sustainable weight loss, most UK health professionals recommend a calorie deficit alongside increased physical activity. If you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions, prescription weight management medications are available in the UK. These work alongside lifestyle changes, not instead of them. This guide covers dietary approaches and the prescription options your GP or a licensed prescriber can assess for you.
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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.
Prescription Weight Loss Options Available in the UK
Three prescription-only medications are licensed in the UK for weight management:
- Mounjaro (tirzepatide) — dual GIP and GLP-1 receptor agonist, once-weekly injection, doses from 2.5 mg to 15 mg. Clinical trials showed average weight loss of approximately 15–21% of body weight.
- Wegovy (semaglutide) — GLP-1 receptor agonist, once-weekly injection, doses from 0.25 mg to 2.4 mg. Clinical trial data showed average weight loss around 15% of body weight.
- Saxenda (liraglutide) — GLP-1 receptor agonist, daily injection, doses from 0.6 mg to 3 mg.
All three work by signalling to your brain that you feel fuller after eating, reducing appetite and food cravings. Individual results vary significantly. These medications are most effective alongside a reduced-calorie diet and increased physical activity. Use our free GLP-1 weight loss calculator to see projected results 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 Find Out If You're Eligible
In the UK, NHS weight loss medication is available through specialist tier 3 weight management services, typically accessed via GP referral. However, waiting lists vary by region and can be lengthy. Private access is available through online clinics with UK-licensed prescribers, offering faster assessment without NHS referral.
You may be eligible if: BMI of 30 or above, or BMI of 27–29.9 with a weight-related health condition such as type 2 diabetes, high blood pressure, sleep apnoea, or cardiovascular disease. South Asian, Chinese, Black African, and Black Caribbean adults may have access at lower BMI thresholds. Start by speaking with your GP about nhs weight loss services in your area, or explore private options if NHS waiting times are long. Our free BMI calculator can help you check your current category.
- 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 eliminating wheat specifically cause weight loss?
Wheat elimination alone does not clinically studied weight loss. Weight loss depends on overall calorie intake, not wheat exclusion. However, removing high-calorie wheat-based foods may naturally reduce calorie intake if they are replaced with lower-calorie alternatives. For sustainable results, focus on calorie deficit and balanced nutrition rather than single-food elimination.
What is the difference between prescription weight loss medication and diet alone?
Prescription medications like Mounjaro and Wegovy work by reducing appetite and food cravings, making it easier to maintain a calorie deficit. Diet alone requires willpower and discipline. Medications are not replacements for dietary changes — they work best alongside reduced-calorie diet and increased physical activity. Clinical evidence shows medications produce greater average weight loss than diet alone.
How quickly can I access weight loss medication through the NHS?
NHS access requires referral to a specialist weight management service through your GP. Waiting times vary significantly by region (ICB area). Some areas have waits of several months to over a year. Private online clinics offer faster assessment, typically within days. Ask your GP about local NHS availability, or discuss private options if waiting times are long in your area.
Am I eligible for prescription weight loss medication in the UK?
Generally, you may be eligible if you have a BMI of 30 or above, or a BMI of 27–29.9 with at least one weight-related health condition (type 2 diabetes, high blood pressure, sleep apnoea, cardiovascular disease). South Asian, Chinese, Black African, and Black Caribbean adults have lower eligibility thresholds. Only a qualified prescriber can assess your individual eligibility. Use our free BMI calculator to check your BMI category, then speak with your GP.
Can I combine a wheat free diet with prescription weight loss medication?
Yes. If prescribed weight loss medication, you should follow your prescriber's dietary guidance. This typically means maintaining a reduced-calorie diet — wheat exclusion is a personal choice and can be part of your approach if it helps you maintain a calorie deficit. However, medication works best with any sustainable eating pattern that you can maintain long-term, not a specific diet type.
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.