Very high.
> But if a person is regular and does not have any gut issues, how would more fiber help?
There is a ton of research about this and it's why WHO and other orgs state explicitly that fiber reduces rates of colon cancer.
Fiber does nothing.
1. Ancient egyptians ate fucktons of wheat and barley, lentils, chickpeas, etc. They ate massive amounts of fiber lol I mean holy fuck I just can't believe how wrong you are?
2. Fiber is very, very well understood by ALL health organizations to be preventative for colon cancer.
Homo genus is 2 million years old.
Repeating "muh authorities" isnt an argument.
Your willful axiomatic dogmatism isnt science.
Cave paintings dont depict agriculture. They depicted hunting and agrarian nomadic lifestyles