Metabolic syndrome (MetS) modifies the gut microbiota in Mexican adults. A, Principal coordinate analysis (PCoA) of normal weight (NW) subjects and subjects with MetS or class III obesity (OCIII)+MetS on the basis of the weighted UniFrac distances. The red squares represent samples of healthy subjects, blue triangles represent subjects with MetS, and orange circles represent subjects with OCIII+MetS. B, The α diversity by Shannon index in NW subjects indicates higher diversity in healthy subjects than subjects with OCIII+MetS. C and D, Taxonomic summary of the gut microbiota of NW subjects and subjects with MetS and OCIII+MetS at the phylum (C) and at the genus (D) levels. E, Serum lipopolysaccharide (LPS) in healthy subjects, subjects with MetS, and subjects with OCIII+MetS. F, Discriminative taxa at the species level in NW subjects and subjects with MetS and OCIII+MetS were determined using a linear discriminant analysis (LDA) effect size. The green bar chart represents the species that were more abundant in MetS and OCIII+MetS subjects, and the red bar chart represents the healthy subjects.