NANP Board Practice Exam

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Which macronutrient is the most energy-dense, providing the most calories per gram?

  1. Carbohydrates

  2. Fat

  3. Fiber

  4. Protein

The correct answer is: Fat

Fat is the most energy-dense macronutrient, providing 9 calories per gram. This is almost double the amount of calories found in carbohydrates and protein, which each provide 4 calories per gram. Fiber, classified as a type of carbohydrate, is not energy-dense as it is not fully digested or absorbed in the body. Therefore, it does not provide significant calories per gram. Choosing any of the other options would not accurately reflect the concept of energy density in relation to macronutrients.

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