The aim was to evaluate the influence of an intervention on the nutritional and sensory quality of the menus and on the food waste of a Children's Educational Center. It is a quasi-experimental study that used the Qualitative Assessment of the Menu Preparations method and performed the waste-ingestion quantities and clean leftovers. The intervention was characterized by the inclusion of new recipes and adequacy of portions according to recommendations for the children's age group. Data were analyzed using the Mann Whitney test with a significance level of p < 0.05. The intervention resulted in a reduction in the occurrence of the side dish supply, color monotony, presence of sweets, presence of fried foods, sweets associated with fried foods, and repetition of the main dish cooking technique. In addition, there was a significant reduction in the average quantities of waste-ingestion/child (from 69.02 ± 11.87g to 37.06 ± 15.57g), clean leftovers /child (from 161.47 ± 44.12g to 35.23 ± 33.73 g) and clean leftovers percentage (from 39.56 ± 7.96 to 21.01 ± 17.15). The positive influence of intervention reinforces the importance of adjustments in recipes and portioning of preparations to meet the nutritional recommendations and to control food waste.