It possesss high degree of morbidade, over all in the adolescence and frequently they initiate and they affect widely and severely the development of the individual. More focus of the attention of the professionals is each time of the area of the health (psychiatrists, nutritionists, psychologists, psicopedagogos, gastroenterologists and endocrinologistas). He is present, in the nervous anorexy, an inexplicable fear to gain weight or to become obeso, exactly being below of the weight or more intensely, a supervaluation of the corporal form as a whole or of its parts, classically described as distortion of the corporal image. They affect young, white women predominantly and is the bulimia the more common alimentary upheaval, with the laxative use. The difference between sorts diminishes at the beginning in the statisticians of the adolescence.
In the men, it seems to have specific association the homossexualidade. Women in determined professions as athlete, models and dancers also seem to have increased risk of AN and BN and what it seems to explain is that in these activities a pressure bigger for attainment and maintenance of the lean body still exists (Johnson et al., 1999 apud Pinzon, 2004, p.158). They seem to be illnesses ' ' ocidentais' ' , therefore, they occur more in developed and industrialized countries (Guideline, 2000 apud Pinzon, 2004, p.158), mainly after 2 World-wide War, when a true confusion with the auto-image was created. Although already let us register the increase of cases ' ' orientais' ' with possible relation with the fact of the cultural entrance of ocidente in these countries with these references. (Lee et al., 2003 apud Pinzon, 2004, p.158). With regard to the genetics, relatives of first degree have greaters indices of these illnesses. This also occurs with monozygotic twin brothers (Kendler, 1997 apud Pinzon, 2004, p.159). Biological, these people can present a slowness of the esvaziamento of the stomach, or an alteration in the neurotransmitters.