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
Oat Smoothie For Weight Loss — And Prescription Options In The UK
Oat smoothies can be a nutritious part of a weight management plan, packed with fibre and protein to help you feel fuller for longer. However, sustainable weight loss typically requires a combination of dietary changes, increased physical activity, and sometimes medical support. If you're looking to lose weight in the UK, there are several prescription weight loss options available for eligible adults — from NHS specialist services to private prescribing — that can support your weight management journey alongside healthier eating habits.
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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 Prescription Weight Loss Options For Eligible Adults
If you're overweight or obese and want professional support with weight management in the UK, several prescription weight loss medications are now available. The main licensed options are:
- Mounjaro (tirzepatide) — a once-weekly injection that may help reduce appetite and support weight loss, with clinical trials showing an average weight loss of 15–21% of body weight
- Wegovy (semaglutide) — a once-weekly GLP-1 weight loss injection that can help you feel fuller after smaller meals, with trials showing approximately 15% average body weight loss
- Saxenda (liraglutide) — a daily injection approved for weight loss medication in the UK
You may be eligible if you have a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure. Use our free BMI calculator above to check your starting point, and our GLP-1 weight loss calculator to explore potential outcomes with prescription support.
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.
How To Access Weight Loss Support Through The NHS And Private Routes
NHS access: Ask your GP for a referral to your local tier 3 specialist weight management service. Availability and waiting times vary by region, but the NHS can provide prescription weight loss through approved pathways. Private access: Licensed prescribers offer online consultations followed by prescription through registered pharmacies if clinically appropriate — this route is available without NHS referral. Either route is combined with lifestyle changes. Track your progress using our free progress tracker, and discuss any weight management plan — including oat smoothies and other dietary support — with your GP or prescriber to ensure it's right 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.
Can oat smoothies alone help me lose weight?
Oat smoothies are nutritious and can support weight loss as part of a balanced diet due to their fibre and protein content, which promotes fullness. However, weight loss requires an overall calorie deficit, regular physical activity, and sustained lifestyle changes. For many people, oat smoothies are most effective when combined with other healthy eating habits and, if needed, professional support including prescription weight loss options.
Am I eligible for prescription weight loss medication on the NHS?
You may be eligible for NHS weight loss medication 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. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds. Speak to your GP about referral to a specialist weight management service in your area.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are prescription-only weekly injections licensed for weight management in the UK. Mounjaro (tirzepatide) uses a dual GIP and GLP-1 mechanism, with average clinical trial weight loss of 15–21%. Wegovy (semaglutide) is a GLP-1 agonist with average weight loss around 15%. Both work best alongside diet and exercise. Your prescriber can advise which is more suitable for you.
How much weight can I expect to lose with prescription weight loss medication?
Clinical trials show average weight loss of 15–21% of body weight with Mounjaro and approximately 15% with Wegovy over several months. However, individual results vary significantly. Weight loss depends on your starting weight, the dose, your diet, physical activity, and personal factors. Use our free GLP-1 weight loss calculator to estimate potential outcomes based on your circumstances.
Can I get prescription weight loss medication privately in the UK?
Yes, licensed UK prescribers offer online consultations for weight loss medication assessment. If clinically appropriate, prescriptions are dispensed by registered pharmacies. This route doesn't require NHS referral and may have shorter waiting times than NHS specialist services. However, prescriptions are only issued following a proper clinical assessment of your health and eligibility.
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.