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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7 Day Flat Stomach Diet Plan for Weight Loss
A flat stomach 7 day diet plan can jumpstart weight management uk, but sustainable results require realistic expectations and lifestyle changes beyond a single week. The truth is: visible abdominal changes take time, even with dedicated nutrition work. This guide explains what a practical 7-day eating plan might include, how it fits with NHS weight loss guidance, and when prescription weight loss medication or professional support might be appropriate for longer-term results.
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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.
What a 7 Day Flat Stomach Plan Typically Includes
A short-term 7-day diet plan usually focuses on reducing water retention, lowering bloating, and creating a modest calorie deficit. Common elements include: increased water intake (2–3 litres daily), reduced salt and refined carbohydrates, higher fibre from vegetables and whole grains, lean protein at each meal, and limited processed foods and alcohol.
- Hydration: Paradoxically, drinking more water reduces water retention and bloating
- Fibre: Vegetables like broccoli, spinach, and courgettes aid digestion and reduce bloating
- Protein: Chicken, fish, eggs, and Greek yoghurt increase satiety
- Whole grains: Brown rice, oats, and whole wheat bread provide sustained energy
- Limit: Processed foods, excess salt, sugary drinks, and alcohol
A realistic 7-day plan might result in 0.5–1kg weight loss, though much of this initial loss is often water weight rather than fat loss.
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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.
Why 7 Days Isn't Enough for Real Change
Real, lasting abdominal fat loss requires weeks and months of consistent effort, not days. A single week of disciplined eating won't significantly reduce belly fat, though it may reduce bloating and help you feel lighter. For genuine weight loss uk results, NHS guidance recommends losing 0.5–1kg per week through sustained calorie deficit combined with increased physical activity.
If you're struggling to maintain weight loss or want faster results supported by prescription weight loss medication nhs offers, your GP can refer you to specialist weight management services. Tools like our free BMI calculator and GLP-1 weight loss calculator can help you understand your starting point and realistic expectations with evidence-based weight management approaches.
Sustainable abdominal fat loss involves: consistent healthy eating habits over months, regular physical activity (both cardio and strength training), adequate sleep (7–9 hours nightly), and stress management. For adults with bmi weight loss concerns or those struggling with obesity, prescription weight loss medication uk may help support longer-term results when combined with lifestyle changes. Your GP can assess whether you qualify for prescription weight loss uk through NHS specialist services or discuss private options.
- 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 belly fat in 7 days?
You may lose 0.5–1kg in a week through reduced salt, increased hydration, and lower calorie intake, but much will be water weight. Visible abdominal fat loss requires consistent effort over weeks and months. Use our free BMI calculator to track your starting point and set realistic targets.
What should I eat on a flat stomach diet?
Focus on lean protein (chicken, fish, eggs), vegetables, whole grains, and plenty of water. Limit salt, processed foods, alcohol, and refined carbohydrates. Include high-fibre foods like broccoli and spinach to reduce bloating and support digestion.
Is a 7-day diet plan safe?
A short-term healthy eating plan is generally safe if it includes adequate nutrition and calories. However, very restrictive diets (under 1200 kcal/day) should only be followed under medical supervision. Consult your GP if you have health conditions or take medications.
What's the best approach for lasting weight loss?
NHS weight loss guidance recommends losing 0.5–1kg weekly through consistent calorie deficit and increased activity. For those needing additional support, glp-1 weight loss medication may help. Your GP can discuss whether prescription weight loss medication nhs offers is appropriate for your situation.
How do I track my progress?
Use our free progress tracker to log weekly weight changes and measurements. Also track how clothes fit and energy levels — these matter more than the scale alone. Our free BMI calculator helps you understand your health context beyond just weight numbers.
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.