Question

when using atwater factors to determine the amount of calories from carbohydrates, it is necessary to subtract the fiber content, per unit of carbohydrate because ___.
fiber and carbohydrates are not related
fiber cannot be broken down in the body, so it is not used for energy
fiber should not be subtracted from carbohydrates because the binding of these molecules is what allow them to be an accessible form of energy
fiber is loosely bound to carbohydrate molecules, and are cleaved immediately after ingestion

Explanation:

Fiber is a type of carbohydrate but cannot be broken down by human digestive enzymes. Since it doesn't contribute to energy (calories) in the body, its content is subtracted when calculating carbohydrate - derived calories using Atwater factors.

Answer:

fiber cannot be broken down in the body, so it is not used for energy