The diagram depicts the human digestive system. A mixed meal contains 60 g carbohydrate, 20 g protein and 30 g fat. The percentages of each macronutrient that are absorbed are 95 % for carbohydrate, 90 % for protein and 85 % for fat. Using the Atwater factors (carbohydrate = 4 kcal g⁻¹, protein = 4 kcal g⁻¹, fat = 9 kcal g⁻¹),

a) Determine the total caloric energy absorbed from the meal.

b) If the individual's daily energy requirement is 2500 kcal, what percentage of the requirement is supplied by this meal?

Question

The diagram depicts the human digestive system. A mixed meal contains 60 g carbohydrate, 20 g protein and 30 g fat. The percentages of each macronutrient that are absorbed are 95 % for carbohydrate, 90 % for protein and 85 % for fat. Using the Atwater factors (carbohydrate = 4 kcal g⁻¹, protein = 4 kcal g⁻¹, fat = 9 kcal g⁻¹),

a) Determine the total caloric energy absorbed from the meal.

b) If the individual's daily energy requirement is 2500 kcal, what percentage of the requirement is supplied by this meal?

Accepted Answer

Absorbed energy = 529.5 kcal; this is about 21.2 % of a 2500 kcal daily requirement.

Neco Model Questions Vol1 2025 Biology Question 12

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