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QUESTION
Q515) Energy in kcal/g of carbohydrate, protein and fat is in the ratio of ...[AMU 2012 ]

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Standard caloric values for macronutrients are:
Carbohydrates: 4.1 kcal/g
Protein: 5.6 kcal/g
(but in the body is only 4.1 kcal/g due to incomplete oxidation)
Fat: 9.3 kcal/g
Ethanol: 7 kcal/g
Thus ratio 1:1:2
Answer : (d)