CI	Confidence interval
CMA	Comprehensive Meta-Analysis
CNS	Central nervous system
ENS	Enteric nervous system
FSTA	Food Science and Technology Abstract
GABA	Gamma-aminobutyric acid
HPA	Hypothalamic–pituitary–adrenal
IFN-γ	Interferon-gamma
IL-6	Interleukin-6
MeSH	Medical subject headings
PMS	premenstrual syndrome
PND	Perinatal depression
PPD	Postpartum depression
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analysis
RCT	Randomized controlled trial
SMD	Standardized mean difference
TNF-α	Tumor necrosis factor-alpha
WHO	World Health Organization