随着社交媒体中与身体形象有关的内容日益增长，这些讯息是否在青年群体的身体形象认知和生活方式变化中发挥着重要的影响力，有待于更深入、全面的研究。本研究在对社交媒体使用中的身体形象认知和生活方式改变进行研究时，首先通过眼动实验和脑电实验的研究方法对社交媒体中的身体谈论内容可能带来的瞬时影响进行挖掘，并通过生理心理学测量的方式为其提供来自生理层面上的证据。其次，通过半结构化深度访谈的方式对青年群体在社交媒体使用过程中的身体谈论以及身体形象认知与实践状况进行了解，并构建中国社交媒体文化背景下的青年群体身体形象认知与实践模型，在此基础上进行进一步的社会调查，对青年群体的身体形象认知与实践活动进行更近一步的了解和阐释，以期达到对这一问题更深入的理解。一方面，本研究从历时性层面出发，对用户接触社交媒体中身体形象讯息后可能出现的反应和受到的影响进行了探索，脑电实验发现男性和女性在接触社交媒体中的身体形象相关讯息后都会产生社交身体形象焦虑的上升以及运动意愿的上升，并且在性别层面上存在一定的差异，女性受到的影响相较于男性更为明显。针对女性群体开展的眼动实验则发现客体化因素在社交媒体信息接触过程中也起到重要的作用。另一方面，本研究在共时性层面上描摹了中国青年用户群体的身体形象认知与实践状况，并通过对社交媒体身体文化生态下用户的瘦身理想内化、身体形象讯息接触体验以及客体化等核心过程以及行为逻辑的作用机制展开研究，发现社交媒体使用是青年群体身体形象认知失调以及一系列节食行为、运动自主性降低等状况的重要影响因素，而瘦身理想内化和负面的身体谈论则在其中起到了中介作用。对社交媒体中的用户而言，整个社交媒体环境中的文化生态是与他们的日常生活交织在一起的“总体社会生态环境”，但每个个体用户在接触社交媒体以及社交媒体中的讯息并开展社会互动的过程中，他们会依据自身的体验与偏好对自己所接触的讯息内容进行自觉或不自觉的选择，在经历了这个过程之后每个个体用户又都构筑起了一个属于自己的“微生态”，用户在“微生态”之中的状态也是不断发展流变的，这种“微生态”的变化也同样处于与整个“总体社会生态环境”的互动过程之中。

With the increasing amount of body image-related content in social media, whether these messages play an important influence in body image perception and lifestyle change among youth groups is yet to be studied in a more in-depth and comprehensive way. This study investigated body image perceptions and lifestyle changes in social media use. Firstly, we used eye-movement and EEG experiments to explore the possible transient effects of body talk content in social media and provide evidence from the physiological level by means of physiological psychological measures. Secondly, the study used semi-structured in-depth interviews to understand the body talk and body image perceptions and practices of the youth group during social media use, and constructs a model of body image perceptions and practices of the youth group in the context of Chinese social media culture. Based on this, further social surveys are conducted to further understand and interpret the body image perceptions and practices of youth groups in order to achieve a deeper understanding of this issue.On the one hand, this study explored the possible reactions and effects of users‘ exposure to body image messages in social media from an ephemeral perspective. The EEG experiment found that both males and females experienced increased social body image anxiety and increased willingness to exercise after exposure to body image related messages in social media, and that there were gender differences, with females being more significantly affected than males. The eye-movement experiment conducted on women found that objectification factors also play an important role in social media message exposure.On the other hand, this study depicts the body image perceptions and practices of young Chinese users at a cotemporal level, and investigates the core processes of internalization of thinness ideals, exposure to body image messages, and objectification, as well as the mechanisms of behavioral logic in the social media body culture ecology. Social media use was found to be an important influence on the perceived dissonance of body image as well as dieting behavior and reduced exercise autonomy among youth, mediated by internalization of the thinness ideal and negative body talk. For users of social media, the cultural ecology of the entire social media environment is a "total social ecology" that is interwoven with their daily lives. However, in the process of exposure to social media and the messages in social media and social interaction, each individual user makes conscious or unconscious choices about the content of the messages they are exposed to based on their own experiences and preferences. After this process, each individual user builds his or her own "micro-ecology", and the state of the user in the "micro-ecology" is constantly developing and changing. This "micro-ecological" change is also in the process of interaction with the overall " total social ecology".