儿童体表排锌量与膳食锌摄入量的关系

Relationship between Body Surface Zinc Loss and Dietary Zinc Intake in Children

目的研究儿童体表排锌量对确定锌膳食供给量的影响。方法在自然状态下测定２４名学龄前儿童在锌营养正常（Ａ组）和锌营养不良（Ｂ组）条件下体表排锌量。结果当Ａ、Ｂ二组膳食锌摄入分别为每天５．４５和５．０３ｍｇ时，体表锌排出量分别为每天０．２５和０．２３ｍｇ；而当锌摄入量分别为每天７．２０和６．７３ｍｇ时，体表锌排出量则分别为每天０．２９和０．２５ｍｇ，体表锌排出量占总排锌量的５％。如果考虑到这部分锌损失，则锌膳食供给量将增加２１％。结论当儿童锌营养状况良好时，体表排锌量与膳食锌摄入量呈正相关，在确定儿童锌膳食供给量时应考虑体表锌损失。

Objective To study the effects of body surface loss of zinc on the determination of dietary supply of zinc. Methods Body surface loss of zinc was determined in 24 preschool children with normal zinc nutrition (Group A) and zinc malnutrition (Group B). Results Body surface loss of zinc was 0.25 and 0.23 mg daily in Groups A and B with dietary zinc intake of 5.45 and 5.03 mg, respectively, and 0.29 and 0.25 mg daily with dietary zinc intake of 7.20 and 6.73 mg, respectively. The body surface loss of zinc accounted for five percent of the total. Conclusion Considering the loss of zinc from body surface, it is suggested that dietary zinc supply be increased by 21 percent. When children is in good status of zinc nutrition, body surface loss of zinc correlates proportionally with their dietary zinc intake.