Multiple Choice
In human nutrition, how much metabolizable energy is typically attributed to 1 gram of dietary protein?
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1. Introduction to Biochemistry
Proteins
Multiple Choice
In human nutrition, approximately how much metabolizable energy does 1 gram of dietary protein provide?
A
7 kcal per gram
B
9 kcal per gram
C
4 kcal per gram
D
2 kcal per gram
Verified step by step guidance1
Understand that metabolizable energy refers to the amount of energy available to the body from a nutrient after digestion and absorption.
Recall the general energy values for macronutrients: carbohydrates provide about 4 kcal/g, fats provide about 9 kcal/g, and proteins provide about 4 kcal/g.
Recognize that although proteins contain energy, some of it is lost during metabolism and excretion, so the net metabolizable energy is approximately 4 kcal per gram.
Compare the given options with the known standard values for metabolizable energy of proteins to identify the correct value.
Conclude that 1 gram of dietary protein provides approximately 4 kcal of metabolizable energy.
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