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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30 Day Meal Plan For Weight Loss: UK Health Guide
A structured 30-day meal plan can help support sustainable weight loss when combined with a calorie deficit and increased physical activity. In the UK, weight management is most effective when based on NHS principles: steady progress (0.5–1 kg per week), balanced nutrition, and long-term habit change rather than quick fixes. This guide explains how to build an effective meal plan, what works alongside prescription weight loss medication, and how to track your progress. MyWeightCheck tools can help you monitor your weight loss journey and calculate your personal BMI.
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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.
How to Structure a 30-Day Meal Plan for Weight Loss
A successful 30-day meal plan for weight loss in the UK typically follows these core principles:
- Calorie deficit: Aim for approximately 500 kcal per day below your maintenance level to lose around 0.5 kg per week — the NHS-recommended safe rate.
- Balanced macronutrients: Include lean protein (chicken, fish, eggs, legumes), whole grains, and plenty of vegetables to stay fuller for longer and maintain muscle.
- Portion control: Measure portions using your hand (palm-sized protein, fist-sized carbs) or a food scale for accuracy.
- Hydration: Drink 6–8 glasses of water daily — often mistaken for hunger.
- Meal prep: Plan and prepare meals in advance to avoid impulsive, high-calorie choices.
A 30-day timeframe is realistic for building new eating habits and seeing initial results. Use our free GLP-1 weight loss calculator to project potential results if combining dietary changes with 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.
Meal Plan Structure and NHS Weight Loss Guidance
The NHS emphasises sustainable weight management over crash dieting. A structured 30-day plan works best when:
- You focus on whole foods rather than processed options — aim for vegetables, lean proteins, and wholegrain carbohydrates.
- You track your intake using a food diary or app to understand your eating patterns and identify where calories accumulate.
- You include regular physical activity — even 30 minutes of walking daily supports weight loss and overall health.
- You prepare for week-by-week variation — some weeks show faster loss, others plateau — this is normal.
If you're considering prescription weight loss support through NHS weight management services or private prescribing, a structured meal plan complements GLP-1 medications like Mounjaro or Wegovy, which work alongside dietary changes, not instead of them. Track your progress with our free progress tracker to stay motivated.
- 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.
How many calories should my 30-day meal plan include?
For safe, sustainable weight loss of 0.5–1 kg per week, aim for a calorie deficit of around 500 kcal per day. Your exact target depends on your age, sex, activity level, and starting weight. A GP or registered dietitian can calculate your personal needs. Try our free BMI calculator and weight converter to understand your starting point.
Can I follow a 30-day meal plan with weight loss injections like Wegovy or Mounjaro?
Yes. GLP-1 medications like Wegovy and Mounjaro work alongside dietary changes and physical activity — they are not replacements for healthy eating. In fact, prescription weight loss treatment combined with a structured meal plan typically produces better results than either approach alone.
What should I eat if I want to lose weight in 30 days?
Focus on lean proteins (chicken, fish, lentils), whole grains (oats, brown rice), vegetables, and healthy fats (olive oil, nuts). Avoid high-calorie processed foods, sugary drinks, and excess alcohol. Meal prep to maintain consistency. The NHS recommends a balanced, gradual approach rather than eliminating entire food groups.
Is a 30-day meal plan sustainable long-term for weight loss?
A 30-day plan is a starting point to establish healthy habits. Long-term weight management requires ongoing dietary consistency and physical activity. Many people find that after 30 days, structured eating becomes routine. Support from your GP or a registered dietitian helps ensure your approach is sustainable and medically appropriate.
How do I track my weight loss progress over 30 days?
Weigh yourself weekly at the same time of day under the same conditions (morning, after using the toilet). Use our free progress tracker to log weekly measurements. Track more than just weight — note energy levels, how clothes fit, and how you feel. Expect to lose approximately 0.5–1 kg per week, though individual results vary.
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.