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
Is Oat Milk Better Than Cow's Milk for Weight Loss?
Both oat milk and cow's milk can fit into a weight loss plan, but they differ in calories, protein, and nutrients. Oat milk typically contains 30–50 calories per 100ml, whilst cow's milk has around 60–65 calories. However, the "better" choice depends on your individual dietary preferences, goals, and how you use them. Neither is inherently superior for weight management uk — what matters is total calorie intake and consistent lifestyle changes. Your GP can advise on dietary choices that support your personal health goals.
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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.
Nutritional Comparison: Calories and Protein Content
Oat milk: Typically 30–50 calories per 100ml unsweetened, with minimal protein (0.3–1g per 100ml). Flavoured or sweetened varieties can contain 50–80 calories and added sugars.
Cow's milk: Around 60–65 calories per 100ml (whole milk), with approximately 3.3g protein per 100ml. Semi-skimmed milk contains ~49 calories and 3.2g protein. Skimmed milk has ~35 calories and 3.6g protein.
- For lose weight uk strategies, skimmed or semi-skimmed cow's milk offers more protein per calorie, which supports satiety
- Oat milk can still support weight loss but provides less protein unless fortified
- Read labels carefully — some oat milks contain added sugars that increase calories significantly
Protein helps maintain muscle during weight loss and keeps you feeling fuller longer, making it an important consideration in nhs weight loss guidance.
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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.
Which Is Better for Weight Loss and When?
For prescription weight loss medication like GLP-1 weight loss injections, both milks work well — the choice depends on your individual tolerance and preferences. Oat milk is lactose-free and suitable for vegan diets. Cow's milk, particularly skimmed varieties, offers superior protein content for weight management uk, which supports muscle retention during weight loss.
Use our free BMI calculator to establish your current weight baseline, then consider milk choice as part of your broader calorie intake. Small dietary swaps matter, but sustainable weight loss comes from consistent calorie deficit, increased physical activity, and making changes you can maintain long-term.
If you're exploring prescription weight loss options, our GLP-1 weight loss calculator can help you understand potential outcomes alongside your dietary choices.
- 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 oat milk have fewer calories than cow's milk?
Unsweetened oat milk typically has 30–50 calories per 100ml, whilst whole cow's milk has around 60–65 calories. However, skimmed cow's milk contains only ~35 calories per 100ml — making it the lowest-calorie option. Many flavoured oat milks contain added sugars and may exceed cow's milk in calories, so check labels carefully.
Which milk is better for weight loss — oat or cow's?
Neither is inherently "better" for weight loss. Skimmed cow's milk offers more protein per calorie, supporting satiety. Oat milk is lactose-free and lower in calories if unsweetened. Choose based on personal tolerance, preference, and how it fits your total calorie intake. The best milk is one you'll use consistently.
Does milk choice affect weight loss medication like Wegovy or Mounjaro?
Milk choice alone doesn't significantly affect prescription weight loss medication. What matters is your total calorie intake and adherence to dietary guidelines. Both oat and cow's milk can fit into a weight loss plan when used sensibly. Your prescriber will provide dietary guidance alongside medication.
Should I avoid milk entirely when trying to lose weight?
No. Milk is nutrient-dense and can support weight loss when portion-controlled. Cow's milk provides calcium, vitamin D, and protein — all important for bone health and muscle maintenance. Oat milk offers fortified alternatives for those avoiding dairy. Include milk in your calorie calculations and choose varieties that fit your goals.
What's the best milk for NHS weight loss programmes?
NHS weight loss guidance doesn't recommend avoiding milk. Skimmed or semi-skimmed cow's milk offers good protein and lower calories. Unsweetened oat milk is a suitable alternative. Focus on total calorie intake rather than eliminating food groups. Use our free BMI calculator to understand your personal weight baseline and discuss dietary choices with your GP.
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.