Knowledge, practice and attitude of children and adolescence are important determinants of food choices. The purpose of the study was to assess knowledge, practice and attitude of students at two preparatory schools about healthy nutrional requirement. Research design: A descriptive research design was utilized in this study setting: The study was conducted at El Saida Esha School and ElEmam Mohammed Metwaly Elsharawey School in Benha city. The sample: Cluster sample was used. , It included 178 students. Two instruments were used: instrument I: A structured interview questionnaire to assess: socio characteristics of students' knowledge regarding healthy nutrional requirement, and reported practices. Instrument II: A likert scale to assess attitude of studied students about nutrition. Result: the study revealed that 57.3% of students had unsatisfactory practices and 57.9% had good knowledge about Nutrional requirements Also 27.5% had negative attitudes. Conclusion: more than half of students had good knowledge about healthy nutrition while less than half of them had reported satisfactory practices approximately three quarters of them had positive attitudes to healthy nutrional requirements. Recommendations: Continuous health education program for students at preparatory schools to improve their knowledge and practices about healthy nutrional requirements.