See my other comment:
Fiber and colorectal diseases: Separating fact from fiction - World Journal of Gastroenterology https://www.wjgnet.com/1007-9327/full/v13/i31/4161.htm
Fiber and colorectal diseases: Separating fact from fiction - World Journal of Gastroenterology https://www.wjgnet.com/1007-9327/full/v13/i31/4161.htm
Eg, https://journals.plos.org/plosone/article?id=10.1371/journal...