Figure 1: Alterations of gut microbiota in chronic constipation. The gut microbiota is different between constipation and nonconstipation individuals. In constipation individuals, the abundances of Bacteroides and the flora involved in hydrogen production, methanogenesis, and glycerol degradation were increased, whereas the abundances of Bifidobacteria, Lactobacilli, Bacteroides, Roseburia, and Coprococcus were decreased.