[Social medicine's actuality: epidemiology sanitary's foundation]

Appear the Spanish official data of mortality and morbility, as well as available of obesity and the metabolic syndrome to base the thesis of which the pathogenic style of life is the main determinant of one and others. Considerations become on their meaning epidemiologist as well as the forced repercussions in the decisions on the sanitary policy, that must take care of the social causes of becoming ill than their individual consequences more, in a etiologic perspective than more anatomoclinic.