AGA	American Gastroenterological Association
ASCAs	Anti-Saccharomyces cerevisiae antibodies
BMI	Body mass index
CD	Chron’s disease
CDED	Crohn’s disease exclusion diet
CS	Corticosteroids
CRP	C-reactive protein
DALYs	Disability-adjusted life years
EEN	Exclusive enteral nutrition
ESPEN	European Society for Clinical Nutrition and Metabolism
ESPGHAN	European Society of Pediatric Gastroenterology, Hepatology, and Nutrition
ESR	Erythrocyte sedimentation rate
FC	Fecal calprotectin
FMT	Fecal microbiota transplantation
FODMAP	Fermentable Oligo-, Di-, Monosaccharides, and Polyols
GI	Gastrointestinal
HBI	Harvey–Bradshaw index
IBD	Inflammatory bowel disease
IBD-U	Inflammatory bowel disease unclassified
ILC3s	Group 3 innate lymphoid cells
IL-22	Interleukin-22
MAMPs	Microbe-associated molecular patterns
MD	Mediterranean diet
MRE	Magnetic resonance enterography
NLRs	NOD-like receptors
pANCAs	Perinuclear anti-neutrophil cytoplasmic antibodies
PAMPs	Pathogen-associated molecular patterns
PEN	Partial enteral nutrition
PIBD	Pediatric-onset inflammatory bowel disease
PID	Primary immunodeficiencies
REE	Resting energy expenditure
SCD	Specific carbohydrate diet
SCFAs	Short-chain fatty acids
SDI	Socio-demographic index
Th17	T helper 17
TLRs	Toll-like receptors
TNFalpha	Tumor necrosis factor-alpha
UC	Ulcerative colitis
VEO-IBD	Very-early-onset IBD
WCE	Wireless capsule endoscopy