A fiber is a particle of plants that is not digested in the small intestine. So it arrives intact in the large intestine. Therefore, fibers provide no nutrients, but do have some useful functions for the body. They are important for a healthy digestion.


Fibers are important for proper bowel function. They contribute to the feeling of saturation and thus to the maintenance of a healthy weight. Fibers are mainly carbohydrates, derived from the cell wall of plants. They can naturally be found in a food product, but fibers may also be added later.
There are two types of fibers: fibers which are broken down in the large intestine (fermentable fibers) and fibers which are not broken down in the large intestine (non-fermentable fibers).


Fibers are only found in vegetable foods, not in animal products. Thus, whole grain products, fruits, vegetables and legumes contain a lot of fibers.


Fibers have, depending on the type of fiber, various functions in the body: