INS and obstructive sleep apnea syndrome: In the present cross-sectional study, we explored the relationship between serum 25(OH)D and the cardiometabolic profile of newly diagnosed patients with OSA, showcasing a significant correlation with anthropometric (BMI, WC), glucose metabolism (glucose, insulin, and HOMA-IR), lipidemic (TC, LDLC, HDLC, and TG), inflammatory (hsCRP), and oxidative stress (oxG) indices.