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
Diabetic Weight Loss Diet — Safe, Evidence-Based Strategies
If you have diabetes, losing weight can significantly improve blood sugar control, reduce medication needs, and lower your risk of complications. A diabetic weight loss diet isn't about restriction—it's about making sustainable choices that work with your condition. The NHS recommends a calorie deficit of around 500 kcal per day for steady, safe weight loss of approximately 0.5 kg per week. This guide covers dietary approaches, medication options, and practical steps you can take with your GP's support. Whether you're managing type 2 diabetes or prediabetes, achieving a healthy weight can transform your health outcomes.
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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.
Diet Strategies for Diabetic Weight Loss
A diabetic weight loss diet should focus on stable blood sugar, portion control, and nutrient-dense foods. Key principles include:
- Low glycemic index (GI) foods — whole grains, legumes, non-starchy vegetables — help prevent blood sugar spikes
- Protein at each meal — eggs, fish, lean meat, legumes — supports satiety and muscle preservation during weight loss
- Healthy fats — olive oil, avocados, nuts — improve insulin sensitivity and support sustained energy
- Fibre-rich foods — oats, beans, vegetables — slow digestion and support blood sugar stability
- Limit refined carbohydrates and sugary foods — these cause rapid blood sugar spikes and increase hunger
The NHS recommends a Mediterranean-style eating pattern for type 2 diabetes, which has strong evidence for weight management and cardiovascular health. Calculate your personal BMI using our free tool above to understand your starting point, then work with your GP or a diabetes educator to develop a tailored meal plan that fits your lifestyle and medication needs.
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.
Weight Loss Medication and Diabetes Support
For adults with type 2 diabetes or prediabetes who struggle with diet and exercise alone, GLP-1 weight loss injections may help. These prescription medications work alongside dietary changes to support weight management UK schemes. Medications like Wegovy (semaglutide) are GLP-1 receptor agonists that help reduce appetite, support feeling fuller after smaller meals, and may improve blood sugar control.
Clinical trials showed Wegovy helped participants lose an average of around 15% of body weight over 68 weeks—though individual results vary. These are prescription-only medicines requiring a clinical assessment from your GP or a licensed prescriber. Try our free GLP-1 weight loss calculator to estimate potential outcomes. Always discuss medication options with your healthcare team, as your diabetes medications may need adjustment. Weight loss medication is most effective alongside sustained lifestyle changes including diet and increased physical activity.
- 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.
What's the best diet for diabetic weight loss?
Focus on low glycemic index foods (whole grains, legumes, vegetables), protein at each meal, and healthy fats. Avoid refined carbs and sugary foods. The Mediterranean diet has strong NHS evidence for type 2 diabetes. A calorie deficit of 500 kcal/day supports sustainable loss of ~0.5 kg weekly. Work with your GP or diabetes educator for a personalised plan.
Can losing weight help my diabetes?
Yes, significantly. Even 5–clinically studied weight loss can improve blood sugar control, reduce insulin resistance, lower blood pressure, and may reduce medication needs. Weight loss of around 15 kg can lead to type 2 diabetes remission in some people. Always discuss weight loss plans with your GP before starting, as medications may need adjustment.
Is weight loss medication safe for people with diabetes?
GLP-1 medications like Wegovy (semaglutide) are licensed for weight management and have evidence of safety in people with type 2 diabetes. They may even improve blood sugar control. However, if you take insulin or sulphonylureas, your doses may need adjustment—this requires prescriber guidance. All prescription weight loss medications require clinical assessment.
How much weight can I lose with a diabetic diet?
Sustainable loss is typically 0.5–1 kg per week with dietary changes alone. This depends on your starting BMI, calorie deficit, activity level, and medications. Use our free BMI calculator to understand your healthy weight range. With structured weight management UK programmes or medication support, some people achieve 10–clinically studied weight loss over 3–6 months.
Should I see my GP before starting a diabetic weight loss diet?
Yes, always. Your GP needs to monitor your blood sugar levels, as weight loss and dietary changes may alter your medication needs. If you take diabetes medications, your doses may need adjustment. Your GP can also refer you to NHS weight management services or discuss prescription weight loss options if appropriate for your health.
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.