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 Fruit Drink For Weight Loss in the UK
When it comes to weight loss in the UK, choosing the right drinks matters. While fruit drinks can be part of a healthy diet, many commercial options contain high sugar levels that may work against your weight loss goals. For sustainable weight management, the NHS recommends a balanced approach combining dietary choices with physical activity. If you're looking for more structured support, prescription weight loss medication is available for eligible adults through the NHS or private prescription. This guide explores fruit drink choices and explains what medication options exist for those who qualify.
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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.
Weight Loss Drinks and Prescription Options in the UK
Best fruit drink choices for weight loss typically include freshly squeezed orange juice (in small portions), pomegranate juice, and berry smoothies made at home with whole fruit rather than shop-bought versions. Shop-bought fruit juices often contain added sugars — a 200ml glass can contain 20–30g of sugar, equivalent to eating several whole fruits. For genuine weight management in the UK, the NHS recommends water, unsweetened tea, or coffee as primary beverages.
If fruit drinks alone aren't enough, prescription weight loss medication may be an option. UK-licensed medications include Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide) — all GLP-1 or dual GIP/GLP-1 receptor agonist injections. Clinical trials showed these medications helped participants lose 15–21% of body weight on average, alongside reduced-calorie diet and increased physical activity.
- Mounjaro: dual GIP + GLP-1 agonist, once-weekly injection, doses 2.5–15mg
- Wegovy: GLP-1 agonist only, once-weekly injection, doses 0.25–2.4mg
- Saxenda: GLP-1 agonist, daily injection, doses 0.6–3mg
All are prescription-only and require clinical assessment. Try our free GLP-1 weight loss calculator to see projected outcomes at different medication doses.
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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.
Accessing Weight Loss Medication in the UK
NHS access to prescription weight loss medication is through specialist tier 3 or tier 4 weight management services. You'll need a GP referral, and waiting times vary significantly by region — some areas have lengthy waiting lists. Private access is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber, with no NHS referral required.
To find out if you're eligible, check your BMI using our free BMI calculator. Adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease, sleep apnoea), may qualify. Your GP can discuss which option — dietary changes, NHS services, or private prescription — suits your weight management goals best.
- 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 fruit juice help with weight loss?
Fresh fruit juice in moderation can be part of weight loss, but shop-bought juices are often high in sugar. The NHS recommends limiting juice to small portions (150ml) and prioritising whole fruit. For significant weight loss, dietary changes should be combined with physical activity and, if eligible, prescription medication.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are once-weekly injections licensed in the UK for weight management. Mounjaro (tirzepatide) is a dual GIP + GLP-1 agonist; Wegovy (semaglutide) is GLP-1 only. Clinical trials showed similar average weight loss (15–21%), but individual results vary. A prescriber will assess which is suitable for you.
How do I get prescription weight loss medication on the NHS?
Ask your GP for a referral to your local tier 3 specialist weight management service. Eligibility requires BMI ≥30, or 27–29.9 with weight-related health conditions. NHS availability varies by region and waiting times can be long. Private prescription options are also available without an NHS referral.
Are prescription weight loss injections safe?
UK-licensed medications (Mounjaro, Wegovy, Saxenda) have been clinically tested and approved by the MHRA. Like all medicines, they can have side effects — nausea and diarrhoea are common initially. A prescriber will assess whether the medication is safe for your individual health.
How quickly will I lose weight with a GLP-1 medication?
Safe, sustainable weight loss is typically 0.5–1kg per week. Clinical trial data showed average weight loss of 15–21% over 68–72 weeks alongside lifestyle changes. Individual results vary significantly. Use our free weight loss calculator to see projected outcomes based on dose and starting weight.
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.