[Evaluation of micronutrient intake from nutrition lunch among primary school students]

To evaluate the micronutrient intake of nutrition lunch and the proportion contrasting with all day diet among primary school students.

A method of convenient sampling was performed to select 770 students of grades 1 to 6 from four primary schools in Fengtai district of Beijing which offered nutrition lunch. We analyzed school lunch recipes for three consecutive days using diet analysis software and considered the residual situation, calculated micronutrient intake from nutrition lunch, including calcium, iron, zinc, vitamin A, vitamin B_1, vitamin B_2, vitamin C. The micronutrient intake outside school was obtained by using dietary retrospective method.

Inadequate intake ratios of micronutrients of nutrition lunch, including calcium, iron, zinc, vitamin A, vitamin B_1, vitamin B_2, vitamin C, were 100%, 14. 5%, 19. 6%, 78. 7%, 98. 2%, 74. 2% and 92. 7%, respectively. Inadequate intake ratios of seven kinds of micronutrients of all day diet were 94. 2%, 14. 0%, 12. 6%, 61. 7%, 79. 2%, 51. 7% and 63. 9%, respectively. Inadequate micronutrient intake ratios of nutrition lunch and all day diet increased with the age growth( P < 0. 001). The proportion of the actual intake of micronutrients in RNI was lower than the corresponding standards in nutrition lunch and all day diet among all age groups, expect iron and zinc. The levels of iron and zinc reached recommended value( 40%), which was the mean of the proportion of the intake of nutrition lunch in the intake of all day diet, and these levels of other micronutrients were about 30%.

The micronutrient intake situation of nutrition lunch and all day diet failed to meet the needs of the growth and development of primary school students, little contribution was made by the nutrient intake of nutrition lunch for all day diet.