ACE	Angiotensin-Converting Enzyme
ACTH	adrenocorticotropin-releasing hormone
ADHD	attention deficit hyperactivity disorder
ANS	Autonomic Nervous System
ASD	Autism spectrum disorders
ATP	adenosine triphosphatase
BMI	body mass index
CNS	Central Nervous System
CRF	adrenocorticotrophic hormone-releasing factor
DSM	Diagnostic and Statistical Manual of Mental Disorders
ENS	Enteric Nervous System
GABA	Gamma-aminobutyric acid
GBA	gut-brain axis
GMe	Gut microbiome
GM	Gut Microbiota
HPA	Hypothalamic-Pituitary-Adrenal Axis
NE	Noradrenaline
NP	neuropeptide
OS	Operational Species
OUT	Operational Taxonomic Unit
PNS	Peripheral Nervous System
RNA	Ribonucleic Acid
SCFAs	short chain fatty acids