When we refer to interpersonal sources we include professors, parents or partners since have bigger persuasive value that those “health promotion school talking” carried out with massive auditory by doctors and nurses and that the advertising means as television, the radio and the magazines, in short, not personalized sources. The children don't consider to all the reliable means in a same way; they consider the publicity that appears in magazines for children like the most reliable and unfortunately, in our means, these don't occupy their spaces in promoting the health objectively. In the case of radio and television, most of the children don't always believe that the message or instruction transmitted as a thing that they need and the attitude of the children toward these becomes but negative with the age (3-4). The continuity and duration of the promotion messages are, of equal it forms, elements to consider, since to change a behaviour takes a lot of time.