AGB	Adjustable gastric banding
BIB	Bilio–intestinal bypass
BL	Blind loop
BMI	Body mass index
BPD/DS	Bilopancreal diversion with duodenal switch
BS	Bariatric surgery
CNS	Central nervous system
DES	Duodenal endoluminal barrier sleeve
DJB	Duodenal–jejunal bypass (B-DJB: with biliopancreatic limb, J-DJB: with jejunectomy)
DS	Duodenal switch
GG	Glandular gastrectomy
GI	Gastrointestinal
IQR	Interquartile range
IT	Ileal interposition
LSG	Laparoscopic sleeve gastrectomy
LGB	Laparoscopic gastric bypass
N.R.	Not reported
QoL	Quality of life
RYGB	Roux-en-Y gastric bypass
SCFA	Short chain fatty acids
VBG	Vertical banded gastroplasty