By means of the project of a «natural history of morals», we can understand some issues of Nietzsche’s framework, where human «nature», i.e. human physiology and psychology, is linked to morality, norms, and institutions. Exploring these connections through the example of passions (and especially of love), this paper discusses the anthropological account that serves as a basis for the mentioned «natural history of morality».By doing so, we intend to clarify the importance of becoming aware of the (often implicit) anthropological assumptions lying behind every philosophical project which seeks a transformation of human selfunderstandingA través del proyecto de una «historia natural de la moral», podemos entender algunos puntos del plan...