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
Can You Lose Weight on a Vegetarian Diet?
Yes, you can absolutely lose weight on a vegetarian diet — but like any eating pattern, successful weight management UK depends on creating a calorie deficit alongside regular physical activity. A well-planned vegetarian diet can be rich in fibre, whole grains, legumes, and vegetables, which may help you feel fuller for longer. However, some vegetarian foods are calorie-dense (nuts, oils, cheese), so portion control and food choices remain important. This guide explains how to approach vegetarian weight loss effectively, and what options are available if you need additional support from your GP or specialist services.
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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.
Vegetarian Weight Loss: Nutrition Essentials
To lose weight successfully on a vegetarian diet, focus on nutrient-dense, whole foods and maintain a calorie deficit of roughly 500 kcal per day, which typically results in losing around 0.5 kg per week — the NHS-recommended safe rate. Prioritise:
- Protein sources: Lentils, chickpeas, tofu, tempeh, nuts, seeds, and Greek yoghurt help preserve muscle mass during weight loss
- Whole grains: Brown rice, oats, quinoa, and wholemeal bread provide sustained energy and satiety
- Vegetables and fruit: Low in calories, high in fibre — eat them freely at most meals
- Healthy fats: Use olive oil, avocados, and nuts sparingly — they're calorie-dense despite being nutritious
Avoid relying too heavily on processed vegetarian products (meat substitutes, vegan cheese), which can be high in salt, sugar, and calories. Track your intake using a food app initially to understand portion sizes — this helps with lose weight UK strategies. Our free BMI calculator can show you your starting point and help monitor progress.
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.
When to Consider Professional Weight Loss Support
If you're following a vegetarian diet but struggling to lose weight, or if you have a BMI over 30 (or 27+ with weight-related health conditions), you may be eligible for prescription weight loss medication through the NHS or private providers. Weight loss injections like Mounjaro or Wegovy are prescription-only options that may support your efforts alongside diet and exercise. Your GP can assess whether medication is suitable for you — no specialist referral is needed for private online prescribing. Our GLP-1 weight loss calculator can help you understand potential outcomes if medication is an option. Always combine any medical treatment with your vegetarian diet plan and physical activity for best results.
- 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 a vegetarian diet good for weight loss?
Yes — vegetarian diets rich in whole foods, legumes, vegetables, and whole grains can support weight loss because they're typically high in fibre and lower in calories than meat-heavy diets. However, weight loss depends on overall calorie intake and physical activity, not diet type alone. Some vegetarian foods (nuts, oils, cheese) are calorie-dense, so portion control matters.
How much protein do I need on a vegetarian weight loss diet?
Aim for 0.8 to 1 gram of protein per kilogram of body weight daily. Good vegetarian protein sources include lentils, chickpeas, tofu, tempeh, Greek yoghurt, nuts, and seeds. Adequate protein helps preserve muscle mass during weight loss and supports satiety, making you feel fuller longer.
Can I use weight loss injections on a vegetarian diet?
Yes. Prescription weight loss medications like Mounjaro and Wegovy work regardless of your diet type. They're designed to reduce appetite and support weight management when combined with a calorie-reduced diet and physical activity. Your prescriber will assess whether you're eligible.
How do I track my vegetarian weight loss progress?
Use our free progress tracker to log your weight weekly. Calculate your BMI using our free BMI calculator to monitor health-related improvements. Food apps like MyFitnessPal help track calories and nutrients. Regular weigh-ins (weekly or monthly) and how your clothes fit are also good progress markers.
Should I see my GP before starting a vegetarian weight loss plan?
If you have existing health conditions (diabetes, heart disease) or take medications, consult your GP first. They can advise whether your vegetarian diet plan is nutritionally balanced and whether prescription weight loss medication might be 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.