A prospective study evaluates ultrasound-derived fat fraction (UDFF) as a tool to monitor hepatic steatosis after bariatric surgery. Host commentary unpacks how UDFF may offer a non-invasive, accessible, and quantitative alternative to MRI-PDFF and liver biopsy, and highlights UDFF's clinical potential for routine liver fat surveillance. Quantifying changes in steatotic liver disease after bariatric surgery using ultrasound-derived fat fraction. Nanda Thimmappa, Gaballah, Labyed, et al. Radiology Advances, 2025, 2(3), umaf018