Table 2.

Several factors contributing to improved type 2 diabetes after bariatric surgery

Target	Major site of secretion (anatomical location)	VSG	RYGB
Ghrelin	X/A-like cells (stomach)	Decrease	Decrease or no change
GLP1	L cells (distal gut)	Increase	Increase
PYY	L cells (distal gut)	Increase	Increase
Bile acids	Hepatocytes	Increase	Increase
FGF-15/19	Ileum	Increase	Increase
Microbiota	Gut	Change	Change
Enteroplasticity	Gut	Change	Change

Multiple factors appear to drive the remission of type 2 diabetes after bariatric surgery, including decreased ghrelin, increased glucagon-like peptide, increased peptide-YY, increased bile acids, increased fibroblast growth factor-15/19, and alteration of microbiota and enteroplasticity. Data are derived from both human and animal studies. GLP1: Glucagon-like peptide 1; FGF: Fibroblast growth factor; PYY: Peptide-YY; RYGB: Roux-en-Y gastric bypass; VSG: Vertical sleeve gastrectomy.