Indyo y'ibiryo ni ubwoko bwibiryo ntibishobora gusenywa n imisemburo yigifu yumubiri wumuntu, ntishobora kwinjizwa numubiri wibintu bya polysaccharide hamwe nijambo rusange muri lignin.
Nubwo ifite itandukaniro rigaragara na poroteyine, ibinure, vitamine nizindi ntungamubiri, bifite akamaro kanini ku buzima bwabantu, kugeza mu myaka ya za 70, fibre yimirire yinjijwe kumugaragaro mumirire yimirire, ishyirwa mubikorwa nk "intungamubiri za karindwi", hanyuma isoko ryerekana inzira nziza yo gukura.