NANP Board Practice Exam

What is the sum of dietary fiber and functional fiber known as?

1. Cellulose

2. Hemicellulose

3. Total fiber

4. Roughage

The correct answer is: Total fiber

The sum of dietary fiber and functional fiber is known as total fiber. This term encompasses all forms of fiber present in the diet, including naturally occurring fibers found in whole foods (dietary fiber) and those added to products for health benefits (functional fiber). Understanding total fiber is crucial for assessing dietary intake and ensuring optimal health, as both types contribute to digestive health, blood sugar regulation, and various other benefits. Other terms like cellulose and hemicellulose refer specifically to types of dietary fiber found in plant cell walls, while roughage generally describes high-fiber foods but does not specifically quantify the total fiber content. Thus, total fiber is the most accurate and encompassing term for the combination of both dietary and functional fibers.