Could the improvement of obesity-related co-morbidities depend on modified gut hormones secretion?

Table 3 Long term (> 3 mo) fasting serum hormonal changes after bariatric surgery

	RYGB	AGB	SG	BPD/DS
Ghrelin	↓ [77,85,92,97,100]= [24,25,45,72, 87-89,91,95,99,101]↑ [45, 73,78-83,86,88,93,94,96,99]	↓(abs. .inf.)= [24,25,103,104,106]↑[28,27,92,101,102,104,105,107]	↓ [28,27,45,107,114]= (abs. .inf.)↑ (abs. .inf.)	↓ [54,97]= [96,113]↑ [111,112]
GLP-1	↓ [120]= [24,25,26,37,80,89,95,116,119,121]↑ (abs. .inf.)	↓ [120]= [24,25,106,120]↑ [102]	↓ (abs. .inf.)= (abs. .inf.)↑ (abs. .inf.)	↓ (abs. .inf.)= (abs. .inf.)↑ (abs. .inf.)
PYY	↓ (abs. .inf.)= [24,25,89,91]↑ [25,45,81,96,119,120]	↓ (abs. .inf.)= [24,25]↑ [120]	↓ (abs. .inf.)= (abs. .inf.)↑[45]	↓ (abs. .inf.)= (abs. .inf.)↑ (96)
Insulin	↓[25,78,78,87,89,74,94,95,97,98,99,100,102,120,121,127,129-135]= [24,25,80,89,91]↑ [82,84,95,99,130]	↓ [25,92,102,104,120,131]= [106]↑ (abs. .inf.)	↓[48]= (abs. .inf.)↑ (abs. .inf.)	↓ (97,113,126)= (abs. .inf.)↑ (abs. .inf.)
Leptin	↓ [24,25,78,79,89,92-94,96-99,101,127,129,132,135]= (abs. .inf.)↑ (abs. .inf.)	↓ [25,92,101-104,106,132,136]= [24]↑ (abs. .inf.)	↓ (abs. .inf.)= (abs. .inf.)↑ (abs. .inf.)	↓ [97,111-113]= [54,96]↑ (abs. .inf.)
Adiponectin	↓ (abs. .inf.)↑ [78,79,84,87,90,93,94,97,99,131,133,134]	↓ (abs. .inf.)	↓ (abs. .inf.)= (abs. .inf.)↑ (abs. .inf.)	↓ (abs. .inf.)= [54]↑ [97]

↓: Decreased; =: Not significant; ↑: Increased_; abs. inf.: Absence of information. The number inside the Table indicate the related references. RYGB: Roux-en-Y gastric bypass; AGB: Adjustable gastric band; SG: Sleeve gastrectomy; BPD/DS: Biliopancreatic diversion with or without duodenal switch; GLP-1: Glucagon-like peptide-1; PYY: Peptide tyrosine-tyrosine.