How individual BMI affected general cognitive ability in young adults: a moderated chain mediation model - Lv, KeZhen; Xu, ShengJie; Sun, YuQi; Zhou, Rui; Xu, Hanyuan; He, Junhao; Xu, Cheng; Xu, Hui; Xu, Jing; Qian, Jun (Frontiers in Public Health, 2025)