What is fiber classified as?

Fiber is classified as a tough complex carbohydrate that the body cannot digest. Unlike other carbohydrates that are broken down into sugar molecules for energy, fiber passes through the digestive system relatively intact. This characteristic makes fiber particularly beneficial for digestive health, as it helps to regulate bowel movements, contributes to a feeling of fullness, and can assist in managing blood sugar levels.

As a non-digestible carbohydrate, fiber comes primarily from plant sources such as fruits, vegetables, grains, and legumes. Given its unique structure, it provides important health benefits without adding calories to the diet. This contrasts with the other choices, which do not accurately reflect the biochemical nature and physiological roles of fiber.