Multiple Choice
In human nutrition, how much metabolizable energy does 1 gram of protein provide (Atwater factor)?
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1. Introduction to Biochemistry
Proteins
Multiple Choice
In human nutrition, how much energy does 1 gram of dietary protein provide?
A
9 kilocalories (kcal)
B
7 kilocalories (kcal)
C
4 kilocalories (kcal)
D
2 kilocalories (kcal)
Verified step by step guidance1
Understand that dietary macronutrients provide different amounts of energy per gram: carbohydrates, proteins, and fats each have characteristic energy values.
Recall the standard energy values for macronutrients: carbohydrates provide approximately 4 kcal/g, fats provide about 9 kcal/g, and proteins provide around 4 kcal/g.
Recognize that the question specifically asks about the energy provided by 1 gram of dietary protein, so focus on the protein value.
Note that although alcohol and other substances have different energy values, proteins consistently provide about 4 kilocalories per gram in human nutrition.
Conclude that 1 gram of dietary protein provides approximately 4 kilocalories (kcal) of energy.
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