Table 1.

Summary of different metabolic surgical working mechanism, advantages and disadvantages

	Sleeve Gastrectomy	Roux-en-Y Gastric Bypass	Adjustable Gastric Band	Biliopancreatic Diversion
How it works?	↑Glucose homeostasis	Smaller stomach pouch holds the lesser food	↑Fullness	Significant ↓absorption of calories
	↑Weight loss	↓Hunger	Slowing down emptiness	↑Glucose homeostasis
	↓Hunger and ↑Stomach fullness	↑Fullness		↑Weight loss
		↓Absorption of calories		↓Hunger and ↑Stomach fullness
Advantages	Simpler procedure than other bariatric surgery	Sustainable weight loss	Least occurrence of complication	Most effective method for the remission of T2DM
	Can be done with the T2DM patients with other high risk medical conditions	Obesity associated complications remissions are high	AGB can be removed, if needed	Best in weight loss and improvement of obesity
	It can be a bridge surgery to other bypass surgeries like SADI-S		Low risk of nutritional deficiencies than other procedures	Lower rate of relapse
Disadvantages	Irreversible	Complex procedure than sleeve gastrectomy	Several re-arrangements of band to be done during the first years	Complications and mortality are higher than other procedure
	Worsening of existing reflux disease and/or onset of new	↑Incidence of micronutrients deficiencies	Weight loss is lower and slower than other procedures	Higher rate of nutritional deficiencies
	↓Effectiveness on metabolism	Possibility of developing ulcer while using non-steroidal anti-inflammatory drugs (NSAID)	Slippage of band movement
		Dumping syndrome