Table 3. Comparison between different weight-reducing bariatric surgical interventions based on %TBWL, NAS, and NFS improvement and the incidence rate of adverse events.

Surgical intervention	Procedure	Mean %TBWL	NAS improvement	NFS improvement	Adverse event (%)
Sleeve gastrectomy	A restrictive bariatric procedure that involves resection of two-thirds of the stomach's greater curvature and gastric fundus creating a long tubular gastric conduit running along the lesser curvature. 76	−31.7% after 6 mo. 84	−2.3 NAS score improvement. 81	Significant reduction in NFS of −0.7. 81	Nutritional deficiencies (7.4–30.5%). Nondysplastic Barrett's esophagus (15.16%) Choledocholithiasis (5.15%) Cholecystectomy (3%). 87
Roux-en-Y gastric bypass	A reconstructive procedure performed by connecting a limb of the small intestine to a small gastric pouch forming a shape of “ Y .” Bypassing a portion of the large stomach pouch and proximal small intestine reduces the amount of nutrients and calories being absorbed. 77	−34.6% after 6 mo. 84	Improvement or complete resolution of steatosis, steatohepatitis by 91 and 60%, respectively. 78 −2.8 NAS score improvement. 79	31% improvement in NFS 78 −1.0 reduction in NFS score. 79	Cholelithiasis (32–42%) Nutritional deficiencies (30–35%) Dumping syndrome (13%) Gastro-gastric fistula (1–2%) Small bowel obstruction (1.5–5%). 88

Abbreviations: NAS, nonalcoholic fatty liver disease activity score; NFS, nonalcoholic fatty liver disease fibrosis score; TBWL, total body weight loss.