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
Does Kefir Help Weight Loss?
Kefir is a fermented milk drink rich in probiotics and protein, but the evidence that it directly helps weight loss is limited. While kefir may support digestive health and keep you feeling fuller longer, sustainable weight loss requires a calorie deficit, regular physical activity, and consistent lifestyle changes. If you're looking to manage your weight in the UK, it's helpful to understand what actually works — and what doesn't — alongside tools like our free BMI calculator to track your progress.
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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.
What Does the Science Say About Kefir and Weight Loss?
Kefir contains probiotics and protein, both potentially helpful for weight management, but the direct evidence linking kefir to weight loss is modest. A small number of studies suggest that probiotics may modestly improve gut health and support digestion, which could indirectly help with weight management. Kefir also provides roughly 3–6 grams of protein per 100ml, which may help you feel fuller for longer — a useful property during calorie reduction.
However, kefir alone will not cause weight loss. The NHS and clinical evidence consistently show that sustainable weight loss depends on creating a calorie deficit (burning more calories than you consume) combined with increased physical activity. If you're overweight and struggling to lose weight through diet and exercise alone, speak to your GP about weight management options available through the NHS weight loss pathway, which may include prescription weight loss medication.
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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.
Building a Sustainable Weight Loss Plan
If you want to lose weight in the UK, the evidence-based approach involves a reduced-calorie diet, increased physical activity, and consistent behaviour change. Adding kefir to a balanced diet may support digestive health, but it's not a weight loss solution by itself. The NHS recommends losing weight at a rate of 0.5–1 kg per week for safe, sustainable results.
For adults with a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure, prescription weight loss medication may be recommended alongside lifestyle changes. Try our free GLP-1 weight loss calculator to explore what weight loss approaches might suit you, or use our BMI calculator to assess whether you fall within eligibility ranges for NHS support.
- 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.
Is kefir good for weight loss?
Kefir contains probiotics and protein, which may support digestive health and fullness, but it is not a direct weight loss product. Sustainable weight loss requires a calorie deficit and increased physical activity. Kefir can be part of a healthy diet but won't cause weight loss on its own.
How much weight can I lose by drinking kefir?
You cannot lose weight by drinking kefir alone. Weight loss is determined by overall calorie intake, physical activity, and lifestyle factors. The NHS recommends a loss of 0.5–1 kg per week through a balanced calorie-deficit diet and exercise.
What's the best way to lose weight in the UK?
The NHS recommends a combination of a reduced-calorie diet (typically 500 kcal deficit per day), increased physical activity, and behaviour change support. If lifestyle changes are difficult, your GP can refer you to specialist weight management services or discuss prescription weight loss options.
Are there prescription weight loss medicines available on the NHS?
Yes. Adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, may be eligible for prescription weight loss medication through NHS specialist services. These include GLP-1 injections like Wegovy (semaglutide), which clinical trials show can help an average of clinically studied weight loss when combined with diet and exercise.
How do I know if I need help with weight loss?
Use our free BMI calculator to check your starting point. If your BMI is 25 or above, speak to your GP about weight management options. They can assess your individual health and discuss whether NHS services, prescription medication, or lifestyle support is most suitable for you.
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.