Among the macronutrients, which has the highest energy density per gram?

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Prepare for the AFAA Group Fitness Instructor Test. Use flashcards and multiple choice questions, complete with hints and explanations. Get ready to ace your exam!

Multiple Choice

Among the macronutrients, which has the highest energy density per gram?

Explanation:
Fats are the most energy-dense macronutrient. They provide about 9 kilocalories per gram when oxidized, while carbohydrates and proteins each yield roughly 4 kcal per gram, and water has no energy value. The higher energy yield comes from the chemical structure of fats: long chains of carbon and hydrogen that are highly reduced store more energy that can be released during metabolism. This is why fats pack more calories per gram than the other macronutrients.

Fats are the most energy-dense macronutrient. They provide about 9 kilocalories per gram when oxidized, while carbohydrates and proteins each yield roughly 4 kcal per gram, and water has no energy value. The higher energy yield comes from the chemical structure of fats: long chains of carbon and hydrogen that are highly reduced store more energy that can be released during metabolism. This is why fats pack more calories per gram than the other macronutrients.

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