Below are research articles on konjac the glucomannan plant:
Hsiao-Ling Chen, Han-Chung Cheng, Yann-Jiu Liu, Su-Yuan Liu, Wen-Tze Wu, Nutrition Nov-Dec 2006;22(11-12):1112-9. doi: 10.1016/j.nut.2006.08.009. Epub 2006 Oct 4.
PMID: 17027233
Transient osmotic perturbation causes long-term alteration to the gut microbiota
Carolina Tropini, Eli Lin Moss, Bryan Douglas Merrill, Katharine Michelle Ng, Steven Kyle Higginbottom, Ellen Pun Casavant, Carlos Gutierrez Gonzalez, Brayon Fremin, Donna Michelle Bouley, Joshua Eric Elias, Ami Siddharth Bhatt, Kerwyn Casey Huang, and Justin Laine Sonnenburg, Cell. 2018 Jun 14; 173(7): 1742–1754.e17. doi: 10.1016/j.cell.2018.05.008
PMID: 29906449