Feces are almost entirely deceased gut bacteria and water. I massacred my gut bacteria the day before by consuming a DIY Soylent version with no fiber and taking 500mg of Rifaximin, an antibiotic with poor bioavailability, meaning it stays in your gut and kills bacteria. Soylent's microbiome consultant advised that this is a terrible idea so I do not recommend it. However, it worked. Throughout the challenge I did not defecate.So - he took Rifaximin to kill his gut microbiome because he thought that would help him not defecate. And then because he did not defecate he concluded that the Rifaximin played some role in such anti-defecation? OMFG. This is both bad science and some, well, crazy a*s-sh*t. I - I - I - I just do not know what else to say.
Hat tip to Andrea Kuszewski.