ACTH	adrenocorticotropic hormone
ADHD	attention deficit/hyperactivity disorder
AMPAR	alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor
ANS	autonomic nervous system
APs	antipsychotic drugs
ASD	autism spectrum disorder
CNS	central nervous system
CRH	corticotropin-releasing hormone
ENS	enteric nervous system
FOS	fructooligosaccharides
GABA	γ-aminobutyric acid
GBA	gut–brain axis
GI	gastrointestinal
GM	gut microbiota
GAD	general anxiety disorder
GOS	galactooligosaccharides
HAMD	Hamilton Depression Rating Scale
HPA	hypothalamic-pituitary-adrenal
IDO	indoleamine 2,3-dioxygenase
IFN	interferon
IGF	insulin-like growth factor
IL	interleukin
K/T ratio	kynurenine to tryptophan ratio
LPSs	lipopolysaccharides
MDD	major depressive disorder
PTSD	post-traumatic stress disorder
SAD	social anxiety disorder
SCFAs	short-chain fatty acids
SSRIs	selective serotonin reuptake inhibitors
TNF	tumor necrosis factor
VNA	vagus nerve stimulation