Nowadays, new media plays an important role in people's life. The idea of media attention proved that media would influence the audiences' attitude, opinion direction, opinion strength, actual behavior, and cognitive learning. In this review, the readers' attitude and cognition will be fully analyzed in a controversial topic---genetically modified food (GMF). By reading substantial relevant literature reviews and researches, the result is that new media certainly changed the readers' attitude and cognition, which corresponds to the theory of planned behavior. In this theory, an attitude refers to the individual's evaluation of a particular behavior after conceptualizing. New media, in this case, provides a platform for readers to conceptualize social instances. Therefore, the change in the readers' attitude will lead to a change in their behavior. With this argument in view, new media will first change the customers' attitude and sequentially change their behavior to decide whether to buy the GMF.