Historically, fiber has been removed from foods to enhance digestibility, as exemplified by the Hadza chewing tubers and spitting out fiber.

“the majority of the fiber in the tubers is spit out”

“the hodzo pretty much eat zero fiber it's very low they chew the tubers and spit them out”

“so they the main fiber we ate was the main tuber it was called shumoko i think i dug it with the woman i felt a little bit non-carnivore non-animal-based but i wanted to try it we peel off the outer skin right and you and you eat it and then it's basically like a mass of ropes in your mouth you must spit it out and speaking with the hanza they said to me they spit out most of the roots like these tubers in the wild are almost entirely fibrous as you've probably mentioned things like sweet potato don't occur at in lake eyasi in tanzania there's nothing that starchy that they do sometimes cook the tubers on the fire but most of the time they'll eat them raw and they are a mouthful of fibrous ropey stuff that then they then spit out”

“the tubers which is another major article of diet and to be fair this is their least preferred type of food they would rather eat things other than tubers but they roast these things in the fire they dig them up they're these like long stringy things that look like long sweet potatoes there are multiple species but that's one of the common ones and they're so fibrous that they actually have to spit out a wad of fiber after they're done chewing it”