Human nutrition provides a subject area in which biology and politics interact in two respects. First, nutrition is a factor in human political behavior that may affect both individual decision-making performance and mass participation. Specific conditions, such as hypoglycemia, may affect individual performance, while inadequate energy intakes and qualitative deficiencies may influence mass behavior. Second, public policy affects the nutritional status of individuals and populations. Agricultural policy, food trade policy, nutritional intervention programs, foreign and domestic food aid, and social welfare policies are among the categories of governmental outputs that help determine nutritional conditions in populations and their component groups. Nutritional status, in turn, has feedback effects through mass behavior on political inputs. Thus, human nutrition presents a problem of biopolitical interactions that involves a mutually interdependent relationship with cybernetic properties.