This thesis aims at investigating obesity as identity in stories told by morbidly obese patients attended at an NGO in Rio de Janeiro. It consists of an ethnographic inspired study oriented by interpretive research practices that presents data from both individual and group interviews generated in 2013. As language here is understood as co-constructed, situated and constitutive of social life, this study avoids an essentialist view of social identities. Instead, it emphasizes identities as a result of discursive interactions in which people negotiate meaning about who they are/intend to be. In this process, they seem to be permanently involved in storytelling which suggests the importance of narrative studies as a way for us to understand social life. When taking part in a story, interactants position themselves in relation to each other and to a macro-discursive order where different meanings concerning the body circulate. Although those whose physical appearance does not fit into an ideal model are usually stigmatized, language interactions are considered moments when meanings are in dispute. Consequently, this study points to the importance of microinteraction, since it allows participants not only to contest taken-for-granted meanings about the body but also to negotiate obesity identities beyond stigma. Besides contributing to the area of language studies, since it focuses on identity construction in narratives, this thesis points to wider social issues when it discusses the difficulty morbid obese people face in different everyday situations, such as public transport, love and family relationships, among others. Therefore, this investigation intends to motivate multidisciplinary debates about obesity that may lead to the adoption of public policies aimed at people who should be socially included and integrated.