关键词: 膳食营养素, 体质健康, 营养状况, 知信行, 相关性

Abstract: Objective To investigate the correlation between dietary nutrients intake and physical health of students in a junior middle school in Fangshan District of Beijing, and to provide basis for improving physical health status of teenagers. Methods By cluster sampling method, students of 3 grades in a junior middle school in Fangshan District of Beijing were selected for physical health test, 3-day 24-hour dietary review survey, and questionnaire survey on knowledge, attitude and practice （K-A-P） of nutrition. Results A total of 181 students were effectively investigated, including 92 girls （50.83%） and 89 boys （49.17%）. The control rate of physical health of students in this junior middle school was 34.81%, and the gender difference was statistically significant （Ρ<0.05）. The intake of dietary nutrients among students whose physical health reaching standard was good, but the daily average intake of calcium just accounted for 43.74% of recommended nutrient intake （RNI）. The 9 dietary nutrients intake of students whose physical health not reaching standard all less than the students reaching standard, and the differences were statistically significant （all Ρ<0.05）. The daily average intake of vitamin A and calcium among students whose physical health not reaching standard was below 30% of RNI, protein, vitamin B₂, vitamin C, zinc, selenium and ferrum just accounted for 40%~60% of RNI. The questionnaire scores of K-A-P of nutrition among students whose physical health reaching standard were better than those not reaching standard, and the difference was statistically significant （Ρ<0.01）. Pearson correlation analysis showed that the intake of protein （r=0.706, Ρ<0.01） and calcium （r=0.636, Ρ<0.01） strongly correlated with physical health. Conclusion The physical health of the junior middle school students in Fangshan District of Beijing was poor, and there was a statistical correlation between the dietary nutrients intake and physical health. It is suggested that the physical health of students should be enhanced by reasonable diet.

Key words: Dietary nutrient, Physical health, Nutritional status, Knowledge, Attitude and Practice, Correlation