According to ancient biological theories, nutrition is, along with reproduction, one of the functions of the soul shared by men, animals and plants. At the same time, however, eating habits are among the starting points on which differences between humans, animals and plants are culturally built. This means that a transversal biological praxis can be used as an anthropological device, in order to to fix and identify specific boundaries and thresholds, either symbolic or theoretical, between both animality and vegetality on the one hand, and zoosphere and anthroposphere on the other hand.
