Abstract
First of the series of two articles deals with the interaction of the immune system and nutrition, with the emphasis on the developmental aspects and the role of the immunity. The evolutionary aspects of the immune system in the first months of life are put in the context with the adequate nutrition during this crucial period.
The processes of oral tolerance are also described and the role of the delicate complex interaction of the nutrition and mucosal immunity is emphasized. The first part is followed by the second article of the series that deals with the individual components of the nutrition on the immune system and shortly describes the diseases arising from the pathological interaction of the immunity and nutritional components.