010-111 · Question #137
Which of the following is true about energy contents?
The correct answer is C. water = 0 kcal/gram, protein = 4 kcal/gram, alcohol = 7 kcal/gram. This question tests knowledge of standard macronutrient and water energy values used in nutrition science. Only one answer lists all three values correctly.
Question
Which of the following is true about energy contents?
Options
- Afat = 9 kcal/gram, carbohydrate = 7 kcal/gram, water = 0 kcal/gram
- Bcarbohydrate = 7 kcal/gram, protein = 4 kcal/gram, alcohol = 7 kcal/gram
- Cwater = 0 kcal/gram, protein = 4 kcal/gram, alcohol = 7 kcal/gram
- Dprotein = 9 kcal/gram, fat = 4 kcal/gram, carbohydrate = 4 kcal/gram
How the community answered
(27 responses)- A19% (5)
- B4% (1)
- C70% (19)
- D7% (2)
Why each option
This question tests knowledge of standard macronutrient and water energy values used in nutrition science. Only one answer lists all three values correctly.
Carbohydrates yield 4 kcal/gram, not 7; the value of 7 belongs to alcohol, making this incorrect.
Carbohydrates yield 4 kcal/gram, not 7, making the first value in this choice wrong despite protein and alcohol being correct.
Water provides no caloric energy (0 kcal/gram) because it contains no carbon bonds to oxidize. Protein yields 4 kcal/gram via the Atwater convention, and alcohol yields 7 kcal/gram through hepatic oxidation - both values in choice C are accurate standard figures used in nutrition calculation.
Fat and protein values are swapped - fat yields 9 kcal/gram and protein yields 4 kcal/gram, not the reverse.
Concept tested: Macronutrient and alcohol energy density values
Source: https://www.nal.usda.gov/human-nutrition-and-food-safety/dri-tables-and-application-reports
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