Human nutrition (calorific values): The approximate heat energy released when the body metabolizes 1 gram of fat is what? Report the standard physiological energy value. Choose the correct option.
IIT JEE
Chemistry
Difficulty: Easy
Choose an option
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A4 kcal (≈ 17 kJ)
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B5.5 kcal (≈ 23 kJ)
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C7 kcal (≈ 29 kJ)
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D9 kcal (≈ 38 kJ)
Answer
Correct Answer: 9 kcal (≈ 38 kJ)
Explanation
ConceptPhysiological fuel values: carbohydrates ≈ 4 kcal/g, proteins ≈ 4 kcal/g, fats ≈ 9 kcal/g (≈ 37–38 kJ/g). Alcohol ~7 kcal/g.
Final Answer9 kcal (≈ 38 kJ)