Changes in cytokines and nervous system-related metabolites (A) IL-6 levels in serum at the end of the modeling period (B) 5-HT levels in the brain at the end of the modeling period (C–I) Acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, and hexanoic acid levels in the colon at the end of the modeling period (J) IFN-γ levels in serum at the end of the recovery period (K) IL-6 levels in serum at the end of the recovery period (L) TNF-α levels in serum at the end of the recovery period (M) CORT levels in serum at the end of the recovery period (N) Propionic acid levels in colon contents at the end of the recovery period (O) Isobutyric acid levels in colon contents (P) Isovaleric acid levels in colon contents at the end of the recovery period (Q) Tyr levels in the brain at the end of the recovery period (R) Levels of NE in the brain at the end of the recovery period (S) Levels of E in the brain at the end of the recovery period (T) DA levels in the brain at the end of the recovery period (U) GABA levels in the brain at the end of the recovery period (V) Glu levels in the brain (W) Gln levels in the brain at the end of the recovery period (X) Trp levels in the brain at the end of the recovery period (Y) 5-HT levels in the brain at the end of the recovery period (Z) 5-HIAA levels in the brain at the end of the recovery period. * p < 0.05; ** p < 0.01.