• Sharvika Bharatselvam, Katherine J P Schwenger, Yasaman Ghorbani, Sandra E Fischer, Timothy D Jackson, Allan Okrainec, and Johane P Allard.
• Toronto General Hospital, University Health Network, Toronto, Canada.
• Nutrition. 2024 Oct 1; 126: 112530112530.

ObjectiveBoth Roux-en-Y gastric bypass (RYGB) and laparoscopic sleeve gastrectomy (LSG) are effective at inducing weight loss, but more information is needed on their comparative effectiveness at improving clinical/biochemical outcomes related to the presence of hyperlipidemia, metabolic dysfunction-associated steatotic liver disease (MASLD), or type 2 diabetes (T2D) at baseline. Here we aimed to assess this in real-world practice.MethodsThis is a prospective cross-sectional and cohort study of 142 patients who underwent RYGB or LSG as per clinical practice. Clinical/biochemical data were collected at baseline, prior to surgery and 12 months post-bariatric surgery. Liver biopsy was performed during surgery to diagnose MASLD. The main outcome was 12-month changes in lipid parameters, mainly total cholesterol, between types of surgery.ResultsA TOTAL OF: 107 participants underwent RYGB and 35 underwent LSG. Both groups were similar at baseline except for a higher proportion of males and waist circumference in the LSG group. At 12 months postsurgery, RYGB versus LSG resulted in a significantly lower body mass index, triglycerides, total cholesterol, and low-density lipoprotein. However, alanine aminotransferase was significantly lower in those who underwent LSG. In subgroup analyses RYGB was superior at improving lipid-related parameters in those with hyperlipidemia, whereas LSG was superior at reducing alanine aminotransferase in those with MASLD.ConclusionsRYGB versus LSG leads to greater reductions in body mass index and lipid parameters, especially in those with hyperlipidemia, whereas LSG showed greater improvements in liver enzymes in those with MASLD.Copyright © 2024 Elsevier Inc. All rights reserved.

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