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
Two Week Weight Loss Meal Plan: A Practical UK Guide
A two week weight loss meal plan can help you establish healthy eating habits and see early progress, but sustainable weight management requires more than just 14 days of effort. This guide explains how to structure a nutritious meal plan, the safe rate of weight loss the NHS recommends, and why combining dietary changes with other approaches — including prescription weight loss medication if appropriate — often works better than dieting alone. Whether you're looking to lose weight in the UK through nutrition alone or alongside professional support, understanding the basics of balanced eating is essential.
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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.
How to Structure a Safe Two Week Meal Plan
The NHS recommends losing weight at a rate of 0.5 to 1 kg per week, which means a realistic two week loss is 1 to 2 kg (2 to 4 lbs). To achieve this, you need a calorie deficit of approximately 500 kcal per day. A practical meal plan should include: adequate protein (to preserve muscle), whole grains, plenty of vegetables, healthy fats, and consistent hydration. Breakfast might include oats with berries and Greek yoghurt; lunch a salad with lean chicken and olive oil dressing; dinner grilled fish with sweet potato and broccoli. Avoid extreme restriction — very low calorie diets (under 800 kcal daily) should only be followed under medical supervision and may leave you feeling exhausted. Keep portions balanced rather than eliminating entire food groups. Use our free BMI calculator to track where you stand against NHS weight guidelines, and our weight loss calculator to understand how sustainable habits create long-term progress.
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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.
Weight Management UK: Beyond Two Weeks
A two week meal plan is a starting point, but weight management UK health services emphasize sustainable lifestyle change over quick fixes. After your initial two weeks, the goal is maintaining the habits you've built — consistent meal prep, portion awareness, regular physical activity, and mindful eating. If you're overweight or obese (BMI over 25 to 30+), your GP can discuss whether prescription weight loss medication might support your efforts alongside diet and exercise. GLP-1 weight loss medications or other prescription options may be appropriate depending on your BMI, health conditions, and medical history. Track your progress using our free progress tracker to stay motivated beyond the first two weeks. Remember: sustainable weight loss comes from habits you can maintain, not temporary restriction.
- 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 much weight can I realistically lose in two weeks?
The NHS recommends safe weight loss of 0.5 to 1 kg per week. Over two weeks, you could realistically expect to lose 1 to 2 kg (2 to 4 lbs). Anything faster may involve unsustainable practices or loss of muscle alongside fat. Individual results vary depending on starting weight, metabolism, and activity level.
Should I use a very low calorie diet (VLCD) for rapid two week results?
No. Very low calorie diets (under 800 kcal daily) should only be used under direct medical supervision — typically for specific medical reasons. They increase fatigue, nutrient deficiency risk, and muscle loss. A moderate deficit of 500 kcal daily is safer and more sustainable.
What if I've tried meal planning but still can't lose weight?
If diet and exercise alone aren't working, discuss your weight management options with your GP. You may be eligible for prescription weight loss medication through NHS specialist services or private prescribing, depending on your BMI and health conditions. These work alongside dietary changes, not instead of them.
Can a two week meal plan help with NHS weight loss guidance?
Yes, but it's a starting point. The NHS weight loss pathway emphasizes sustained habit change over weeks and months. Your GP or a tier 3 weight management service can create a longer-term plan tailored to your health. Two weeks is useful for building confidence and structure.
Is it better to diet alone or combine meal planning with weight loss medication?
Evidence shows combining methods works best. A structured meal plan plus regular activity is the foundation. If eligible, prescription weight loss medication (like GLP-1 weight loss injections) supports this by reducing appetite and cravings. Always discuss options with your GP to find what suits 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.