5 HT	5-hydroxytryptamine (serotonin)
ABFat	Android body fat
ACh	Acetylcholine
ADHD	Attention-deficit/hyperactivity disorder
AhR	Aryl hydrocarbon receptor
ASD	Autism spectrum disorder
BAI	Beck Anxiety Inventory
BCFAs	Branched short-chain fatty acids
BDI	Beck Depression Inventory
BDNF	Brain-derived neurotrophic factor
CFB	Cytophaga–Flavobacterium–Bacteroides
CFU	Colony Forming Unit
CNS	Central nervous system
CRP	C-reactive peptide
FFARs	Short-chain fatty acid receptors/free fatty acids receptors
GABA	Gamma-aminobutyric acid
GAD	Generalized Anxiety Disorder
GBFat	Gynoid body fat
GDM	Gestational diabetes mellitus
GIT	Gastrointestinal tract
Glu	Glutamate
GPRs	G-protein-coupled receptors
GRAS	Generally Recognized as Safe
HADS	Hospital Anxiety and Depression Scale
HAM-A	Hamilton anxiety rating scale
HAM-D	Hamilton Depression Rating Scale
HCAR	Hydroxycarboxylic acid receptor
HDACs	Histone deacetylases
HPA axis	Hypothalamic–pituitary–adrenal axis
IBD	Inflammatory bowel disease
IBS	Irritable bowel syndrome
IGF-1	Insulin-like growth factor-1
II	Impedance index
IL	Interleukin
IMAT	Intermuscular adipose tissue
LPS	Lipopolysaccharide
MADRS	Montgomery–Åsberg Depression Rating Scale
MAFLD	Metabolic-associated fatty liver disease
MDD	Major depressive disorder
MetS	Metabolic syndrome
NAFLD	Non-alcoholic fatty liver disease
NF-ĸB	Nuclear factor-ĸB
PAMP	Pathogen-associated molecular patterns
PANSS	Positive and Negative Syndrome Scale
PYY	Peptide YY
RTC	Double-blind, randomized, placebo-controlled trials
SCFAs	Short-chain fatty acids
SIBO	Small intestinal bacterial overgrowth
T2D	Type 2 diabetes mellitus
TAU	Treatment as usual
TBFat	Total body fat
TBLean	Total body lean
TGF-α	Transforming growth factor α
TLRs	Toll-like receptors
TSH	Thyroid-stimulating hormone
WHO	World Health Organization