Gas chromatography-tandem mass spectrometry (GC-MS/MS) was used to analyze 37 fatty acids in serum, conducted in accordance with well-established protocols, which have been previously described in detail (Stupin et al., 2020 (link)). In brief, fatty acids were identified using the GC-MS/MS system by Thermo Fisher GC Trace 1300 coupled with a TSQ 9000 Triple Quadrupole (Thermo Fisher Scientific, Waltham, MA, USA), and the fatty acids profile was analyzed at the BIOCentre’s Bioanalytical Laboratory, BIOCentre-Incubation Center for Biosciences, Zagreb, Croatia.