Concept:In nutritional thermochemistry, the total metabolic energy of food is calculated using standard physiological caloric values: Carbohydrates = \( 4 \text{ kcal/g} \), Proteins = \( 4 \text{ kcal/g} \), and Fats = \( 9 \text{ kcal/g} \).
Formula:$$ \text{Total Energy} = (m_{\text{carb}} \times 4) + (m_{\text{protein}} \times 4) + (m_{\text{fat}} \times 9) $$
Solution:- Energy from carbohydrates: \( 20 \text{ g} \times 4 \text{ kcal/g} = 80 \text{ kcal} \).
- Energy from protein: \( 10 \text{ g} \times 4 \text{ kcal/g} = 40 \text{ kcal} \).
- Energy from fat: \( 9 \text{ g} \times 9 \text{ kcal/g} = 81 \text{ kcal} \).
- Total Energy = \( 80 + 40 + 81 = 201 \text{ kcal} \).
Why other options are incorrect:The other options are mathematically impossible if the standard 4-4-9 multiplier rules are correctly applied.
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