After having founded this:
https://www.amazon.it/Fiber-Menace-Leading.../dp/0970679645
I looked for some researches and I found:
Stopping or reducing dietary fiber intake reduces constipation and its associated symptoms.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3435786/
Can insoluble fibers be a problem?
https://www.amazon.it/Fiber-Menace-Leading.../dp/0970679645
I looked for some researches and I found:
Stopping or reducing dietary fiber intake reduces constipation and its associated symptoms.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3435786/
Can insoluble fibers be a problem?