Which of the following yields the greatest caloric value per gram?
a. Fats
b. Proteins
c. Carbohydrates
d. All are equal in caloric value.

Verified step by step guidance

Step 1: Understand that the caloric value per gram refers to the amount of energy released when the macronutrient is metabolized by the body.

Step 2: Recall the general caloric values for each macronutrient: fats provide about 9 calories per gram, proteins provide about 4 calories per gram, and carbohydrates also provide about 4 calories per gram.

Step 3: Compare these values directly to determine which macronutrient yields the greatest energy per gram.

Step 4: Recognize that fats have more than double the caloric value per gram compared to proteins and carbohydrates.

Step 5: Conclude that among the options, fats yield the greatest caloric value per gram.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Caloric Value of Macronutrients

Caloric value refers to the amount of energy released when a macronutrient is metabolized. Fats, proteins, and carbohydrates each provide different amounts of energy per gram, which is essential for understanding their role in nutrition and energy balance.

Energy Density of Fats

Fats are the most energy-dense macronutrient, providing about 9 kilocalories per gram. This higher energy density means fats yield more calories compared to proteins and carbohydrates, which is important when considering dietary energy sources.

Caloric Content of Proteins and Carbohydrates

Proteins and carbohydrates both provide approximately 4 kilocalories per gram. Despite their similar caloric values, their metabolic roles differ, with proteins primarily used for tissue repair and carbohydrates mainly serving as a quick energy source.

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