CNS	Central Nervous System
MHC	Major Histocompatibility Complex
CD19 and CD20B	Types of Lymphocytes (B Cell Markers)
BDNF	Brain-Derived Neurotrophic Factor
IFNγ	Interferon Gamma
CRP	C-Reactive Protein
IBS	Irritable Bowel Syndrome
NMDAR	N-Methyl-D-Aspartate Receptor
SCFAs	Short-Chain Fatty Acids
GRAS	Generally Recognized As Safe
AI	Artificial Intelligence
DSM-5	Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition
IL-6, IL-8, IL-10, TNF-α	Interleukin 6, Interleukin 8, Interleukin 10, Tumor Necrosis Factor Alpha
HPA Axis	Hypothalamic–Pituitary–Adrenal Axis
ENS	Enteric Nervous System
EGF	Epidermal Growth Factor
GABA	Gamma-Aminobutyric Acid
MGB Axis	Microbiota–Gut–Brain Axis
TLRs	Toll-Like Receptors
LGS	Leaky Gut Syndrome
LPS	Lipopolysaccharide
CCK	Cholecystokinin
PYY	Peptide Tyrosine Tyrosine
GLP-1	Glucagon-Like Peptide-1
CRH	Corticotropin-Releasing Hormone
NO	Nitric Oxide
TPH	Tryptophan Hydroxylase
MAO	Monoamine Oxidase
PET	Positron Emission Tomography
SSRI	Selective Serotonin Reuptake Inhibitors
CLA	Conjugated Linoleic Acid
TSPO	Translocator Protein