Food habits in regard to the nutritional status of preschool children and their socioeconomic situation were analyzed in this research. The study was carried out in Cuetzalan, State of Puebla; all families were studied and, besides the presence of a preschool child in the home, both father and mother should also be living in the same house. Forty children considered as well nourished and 40 malnourished in the opposite case, were selected, taking the limits of the Gómez classification. In order to define socioeconomic differences between the two groups, the sample population was divided into different levels, with the following results. The socioeconomic level of the well-nourished children did correlate with a good living standard of their families; in the other case, families with a low socioeconomic status, presented more nutritional problems. A questionnaire was applied to every mother selected. This included two items: a) In the first case, we tried to assess the mother's attitude towards food habits and children's illnesses. b) In the second case, the mother's knowledge concerning pregnancy, breast feeding, feeding of the child during the first year of life, taboos, beliefs and other aspects which could be related to nutrition. On the whole, the main objective of this study was attained, because significant differences were found between these two groups. Firstly, a good relationship between food habits and good nutritional status of the children was found. Secondly, mother with well-nourished children had better food habits and better socioeconomic status than mothers having children with poor health status, and therefore, of a lower socioeconomic status.