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Learn: Energy Budgets, BMI and Waist-to-Hip Ratio
Edexcel A Level Biology SNAB A
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Welcome!Great to have you here! Building on your understanding of diet, cardiovascular health, and enzymes, today we’ll explore energy budgets, BMI, and waist-to-hip ratio. These concepts help us understand energy balance and assess health risks.
What is an Energy Budget?An energy budget is the balance between energy intake (from food) and energy expenditure (through activity and metabolism). If energy intake exceeds expenditure, weight is gained; if expenditure exceeds intake, weight is lost.
Quick check: What happens if energy expenditure is greater than energy intake?
Start the lesson to answer this multiple choice question
Understanding BMIBody Mass Index (BMI) is a measure of body weight relative to height. It’s calculated using the formula: BMI = weight (kg) / height² (m²). BMI helps indicate whether someone is underweight, healthy weight, overweight, or obese.
Match the items on the left with their correct pairs on the right
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What is Waist-to-Hip Ratio?Waist-to-hip ratio (WHR) is a measure of fat distribution. It’s calculated as waist circumference divided by hip circumference. It helps assess risk for cardiovascular disease, as higher ratios indicate more abdominal fat.
The {{blank0}} ratio is calculated by dividing waist circumference by {{blank1}} circumference.
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Energy Expenditure ComponentsEnergy expenditure includes basal metabolic rate (BMR), energy used for physical activity, and energy used for digestion. BMR accounts for the majority of daily energy use and varies by age, gender, and body composition.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! You’ve learned about energy budgets, BMI, and waist-to-hip ratio. Let’s test your understanding with a few questions.
Which of the following factors affect BMR? (Select all that apply)
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Which measure assesses fat distribution and cardiovascular risk?
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Energy intake comes from {{blank0}}, while energy expenditure is influenced by {{blank1}}.
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Lesson Complete!Well done! You’ve completed the lesson on energy budgets, BMI, and waist-to-hip ratio. These tools are essential for understanding energy balance and assessing health risks. Keep up the great work!
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