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Eating disorders such as anorexia or bulimia are associated with unsuitable behavior, cognition and emotions, which could have negative consequences for a person’s well-being and health. These risks frequently appear during adolescence, as this developmental stage is characterized by physiological, emotional, cognitive, and above all, social changes that lead to a greater concern for physical appearances. The propensity of adolescents to be unhappy with their body image has been stated in many studies, in which case, the adolescent can go so far as to create distorted perceptions of his/her own body. In short, this population shows major discrepancy between the subjective measurements of their body shape (contributed by the subjects) and the real measurements assessed with objective methods, this leading to a larger proportion of eating disorders (Conley & Boardman, 2007; Gardner, 1996; Martin & Gentry, 1997). Perceiving oneself as «obese» when this is not the case indicates a cognitive problem that can be explained by learning imposed by social and cultural pressures. Thus, the self-perception of one’s body becomes a decisive factor for the development of an eating disorder, which is, in turn, more important than body weight itself (Barker & Galambos, 2003; Bessenoff & Snow, 2006; Cash & Deagle, 1997).

Key Variables in the Development of Eating Disorders During the Adolescence: Implications for Sex Differences