Emerging evidence highlights the intricate link between identity and one’s body, however, integrative longitudinal research on this identity-body interplay is lacking. The current study used three-wave longitudinal data (Time 1: N = 403; 52.1% female; M_age = 14.85, SD = 0.89, range = 13–19 years) spanning two years (2019–2021; T1 and T2 being pre-pandemic, T3 peri-pandemic) to identify identity trajectory classes and examine their co-development with negative and positive body image and various body-related variables (i.e., sociocultural pressures, internalization of appearance ideals, self-objectification, appearance comparison, and eating disorder symptoms). First, four identity classes emerged using latent class growth analysis (achievement, moratorium, carefree diffusion, and troubled diffusion). Second, using multigroup latent growth curve modeling, adolescents in less adaptive identity trajectory classes (i.e., engaging less in pro-active processes and more in ruminative processes) displayed higher levels of negative body image and body-related symptoms. The current study testified to the clinically meaningful associations linking identity formation to adolescents’ body image and other body-related symptoms.

新出现的证据强调了身份与身体之间错综复杂的联系，然而，缺乏对这种身份与身体相互作用的综合纵向研究。当前研究使用三波纵向数据（时间 1：N  = 403；52.1% 女性；M_年龄 = 14.85，SD = 0.89，范围 = 13-19 年）跨越两年（2019-2021；T1 和 T2 处于大流行前，T3 大流行期间）以识别身份轨迹类别并检查它们与消极和积极的身体形象以及各种身体相关变量（即社会文化压力、外表理想的内化、自我客体化、外表比较和饮食失调症状）。首先，使用潜在类别增长分析（成就、暂停、无忧无虑的扩散和有问题的扩散）出现了四个身份类别。其次，使用多组潜在增长曲线建模，适应性较低的身份轨迹类别中的青少年（即较少参与主动过程，更多参与沉思过程）表现出更高水平的负面身体形象和身体相关症状。