The objective of this research was to determine the effect of a nutritional educational intervention on the eating habits and nutritional status of secondary school adolescents at the I.E San Pablo de la Luz - San Juan Bautista. The study adopted a quantitative, quasi-experimental approach, with design of two groups (experimental and control), pre - test and post - test, and a longitudinal section. The sample was random probabilistic, with 134 adolescents. An attendance control, knowledge evaluation, eating habits questionnaire, IMC/E, T/E measurements and hemoglobin dosing were used to evaluate the results. The Chi Square statistical test validated the proposed hypothesis. The results showed an increase in hemoglobin levels from 41% to 59% after the intervention, indicating a positive impact of 18%. Regarding IMC/E, low weight remained at 0% in both evaluations, the normal range increas...