GSTM1 and anemia (phenotype): ↑ Types and quantity of vegetables used in feeding; HHs purchase fortified foods;↑ Postexam lessons on nutrition, food fortification, hygiene, and health; no impact on the knowledge of foods needed by schoolchildren↑ Attitude on meal preparation and cooking vegetables Knowledge and practices of the mothers associated with children's weight↑ Mean Hb concentration in school 1; ↓ prevalence of anemia in school 1↓ Underweight (school 2) and stunting (school 1); no impact on wasting Mothers: ↑ Purchase of fortified foods, ↑ practice of washing vegetables before use