The purpose of this literature review is to highlight the impact of body image on the perception and emotion that adolescents held toward their body. Body image is clearly a social construction and has strong social basis. This paper includes the review of the social construction of body image, the transition of body image through media, the impact of body image on dieting behavior and health behavior, and the implication for practice. Professionals in medicine as well as in health education should pay more attentions to the influence of body image on adolescents’ health and self-perception. We also strongly urge that they should take the responsibility to construct an appropriate body image for adolescent and teach adolescents how to reject those incorrect body images portrayed in mass media.