The history of the proposition of multimixture as a practice of nourishment is marked by its confrontation with scientific knowledge, especially about nutrition. Since the beginning of the 1990s, when multimixture was about to configure a governmental program to fight malnutrition among poor children, fierce disputes have arisen between nutritionists and supporters of the use of multimixture. I tell three stories about these disputes. Each of these three stories inhabits the cognitive economic-political-social universe of infant nutrition with entities that present themselves as of different natures disputing reality in infant nutrition in Brazil.