This study is based on an understanding of health and rural labor as a social process related to the characteristics of the agrarian issue in Brazilian society, focusing on sugar cane cutters in northeastern São Paulo State, Brazil, and attempting to identify patterns of attrition and reproduction in such labor. Based on direct observations, interviews with laborers and other agents involved in production, and a related bibliographical review, the analysis points to daily exposure of cane cutters to physical, chemical, and biological hazards resulting in various diseases, traumas, and accidents: dermatitis, conjunctivitis, dehydration, cramps, dyspnea, respiratory infections, high blood pressure, and wounds, besides aggravating the biopsychic burden underlying attrition patterns showing up in the spinal column, chest, head, and lumbar pains, nervous breakdowns, and other kinds of psychosomatic manifestations. This study of the work process pointed up its unhealthy working conditions and helped provide an overview of the conditions and means by which capital asserts itself in Brazil - in its self-reproduction process - especially in the agro-industrial sector.