This work will examine the study of organic fluids and movements in the Nueva filosofía de la naturaleza del hombre, published by Oliva Sabuco de Nantes in 1587. The representation of the internal anatomy shows the dynamics that flow back and forth, combining the power of emotions and affects, the processes of digestion and the influence of the environment, all of which are expressed in Sabuco’s vision through the ebb and flow of movements of growth and decay. The categories of dry and wet are themselves governed by the emotions, in particular tristeza y descontento, when the soul and body are in discord. The regulating role of the emotions on the movement of fluids and even on the principles of digestion brings us back

back to the centre of the vital composition, which for Sabuco is the brain. From then, the flow of fluids in all their forms (milk, semen, bile, gastric fluid, tears, white blood, chyle) led us to follow Sabuco’s project of medical reform. But what happens in this text with the legacy of ancient and galenic physiology’s theories on fluids and humours? What philosophical interpretation stems from this interpretation of the bodily fluidity, which affects men, women and animals equally? The bodily fluidity in Sabuco gives rise to a rich metaphorical expression and highlights a vitalism correlated with a global vision of society whose reform project concludes the 1587 work.