The Glutamate-Serine-Glycine Index as a Biomarker to Monitor the Effects of Bariatric Surgery on Non-alcoholic Fatty Liver Disease

In a longitudinal bariatric surgery case series, liver fat (PDFF), cT1, and the glutamate–serine–glycine (GSG) index all showed reductions postoperatively. These findings support integrating blood and imaging biomarkers to monitor improvement and guide interventions.