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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Vegetarian Diet Plan for Weight Loss
A well-planned vegetarian diet can be an effective approach to weight loss when it includes the right balance of nutrients and creates a sustainable calorie deficit. Many UK adults following vegetarian eating patterns successfully lose weight through careful meal planning, increased physical activity, and consistent healthy choices. Whether you're considering a vegetarian approach or already follow this diet, understanding the nutritional principles and practical strategies can help you achieve your weight management goals. Use our free BMI calculator to track where you currently stand, and remember that sustainable weight loss typically occurs at a rate of 0.5 to 1 kg per week.
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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.
Vegetarian Eating for Weight Loss — Key Principles
A vegetarian diet can support weight loss because it typically emphasises whole plant foods like vegetables, fruits, legumes, and grains — many naturally lower in calories but rich in fibre and nutrients. Key principles include:
- Protein intake: Include beans, lentils, tofu, tempeh, nuts, seeds, and dairy (if not vegan) to maintain muscle mass and promote satiety
- Portion control: Plant-based foods are often less calorie-dense, but processed vegetarian products can contain hidden sugars and fats — check labels carefully
- Whole foods focus: Prioritise unprocessed vegetables, fruits, wholegrains, and legumes over vegetarian meat substitutes
- Calorie awareness: A calorie deficit of approximately 500 kcal per day typically results in losing around 0.5 kg weekly — this remains true on any diet, including vegetarian
Evidence suggests that vegetarians often have lower body weight on average than meat-eaters, though this depends heavily on food choices. Processed vegetarian foods, fried items, and high-fat dairy can undermine weight loss efforts. Track your intake using our weight loss calculator to monitor progress alongside dietary changes.
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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 Vegetarian Weight Loss Plan
Successful weight loss on a vegetarian diet requires meal planning, consistent habits, and balanced nutrition. Start by identifying your current calorie needs and reducing by 500 kcal daily for gradual, sustainable loss. Plan meals around high-protein vegetarian sources — a typical day might include Greek yoghurt with berries, a lentil and vegetable stir-fry, and a chickpea salad.
- Meal prep once weekly to avoid relying on processed convenience foods
- Stay hydrated — often thirst is confused with hunger
- Combine diet with regular physical activity for best results and improved cardiovascular health
- Monitor your BMI using our free converter and BMI calculator to track meaningful progress beyond the scales
If you're not seeing results after 8–12 weeks of consistent effort, speak to your GP about other weight management approaches, including prescription options where appropriate.
- 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 I lose weight on a vegetarian diet?
Yes. A well-planned vegetarian diet can effectively support weight loss through whole foods, adequate protein, and calorie awareness. Success depends on food choices — processed vegetarian products and excessive oils can hinder progress. Combine dietary changes with physical activity for best results.
What proteins should I eat on a vegetarian weight loss diet?
Include beans, lentils, chickpeas, tofu, tempeh, nuts, seeds, pumpkin seeds, and dairy products like Greek yoghurt and cottage cheese. These provide sustained fullness and preserve muscle mass during weight loss. Aim for protein at each meal.
How quickly will I lose weight on a vegetarian diet?
The NHS recommends losing 0.5 to 1 kg per week for sustainable results. This requires a calorie deficit of approximately 500 kcal daily. Individual rates vary based on starting weight, activity level, and dietary adherence.
Should I consider weight loss medication alongside a vegetarian diet?
If you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions, prescription weight loss options like GLP-1 injections may be suitable. These work alongside diet and exercise. Speak to your GP or a prescriber to discuss eligibility and suitability for your circumstances.
How do I know if my vegetarian diet is nutritionally balanced for weight loss?
Ensure you're getting adequate protein, iron (from leafy greens, legumes, fortified cereals), vitamin B12, calcium, and omega-3 fats. Consider consulting a registered dietitian to review your plan, especially if losing weight. Use our progress tracker to monitor weight alongside energy levels and wellbeing.
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.