Malnutrition in the first few years of life leads to antisocial and aggressive behavior throughout childhood and late adolescence, according to a new University of Southern California study. “These are the first findings to show that malnutrition in the early postnatal years is associated with behavior problems through age 17,” said Jianghong Liu, a postdoctoral fellow with USC’s Social Science Research Institute and the lead author of the study published in the American Journal of Psychiatry’s November issue.