?O ka fiber dietary kahi ?ano mea?ai ?a?ole hiki ke wāwahi ?ia e nā enzyme digestive o ke kino o ke kanaka, ?a?ole hiki ke ho?opili ?ia e ke kino o nā mea polysaccharide a me ka hua?ōlelo lignin.
?Oiai aia nā ?oko?a like ?ole me ka protein, ka momona, nā huaora a me nā mea?ai ?ē a?e, he mea nui ia i ke olakino o ke kanaka, a hiki i ka makahiki 1970, ua ho?olauna mua ?ia ka fiber dietary i loko o ke kaiāulu mea?ai, i helu ?ia ?o "?ehiku mau mea?ai", a laila hō?ike ka mākeke i kahi ulu ulu maika?i.