According to World Health Organization, (PINE et al 2004), in studies of populations, the index of Corporal Mass (IMC) (defined for the weight in kg divided for the height in square meters) one becomes measured useful to evaluate excess of corporal fat, being consensual to admit that, independently of sex and equal or superior age, adults with IMC 30kg/m2 they must be classified as obesos. Although the IMC to be the parameter more used to determine the different levels of obesidade it comes being coats, therefore its evaluation if of the one of very ample form, not prioritizing the particularitities of each individual. In accordance with Angel THERE (1998 apud. the R. . PINE 2004), the IMC does not describe the ample variation that occurs in the corporal composition of individuals, disrespecting age, relation between IMC and pointers of corporal composition, as for example, the corporal fat. Thus, these criteria can mean little especificidade in terms of association of risk of health between different individuals or populations. In this way the obesidade although to be an illness sufficiently argued and studied, its conceptualization if becomes difficult due to the diverse factors that influence in its incidence.
The care with the generalization of obesos individuals must be well-taken care of, therefore the genetic factors how much to the alimentary errors can be on in such a way. However well-taken care of urgent they must be taken had to the emergent growth of obesos individuals in the population, amongst these cares we can cite, the adequacy of a more healthful feeding, you practise of physical activities regular, and mainly well-taken care of and adjusted nutricional accompaniment. The 3 TRISSOMIA OF CHROMOSOME 21 the syndrome of characterized Down as trissomia of chromosome 21 are the most frequent of the syndromes of congenital effect associates to the mental retardation (OTTO, OTTTO and FROTA-PESSOA 2004), being also called Mongolism due to face appearance of its carriers.