补充维生素A、β－胡萝卜素对农村青少年机体维生素A储存水平的影响

本文对８２名１２～１５岁、体重３５～４５ｋｇ的农村初中学生进行了维生素Ａ、β－胡萝卜素的补充实验研究。实验１组（ｎ＝２１）每天补充２ｍｇ的β－胡萝卜素，实验２组（ｎ＝１９）每天补充６ｍｇ的β－胡萝素，实验３组（ｎ＝２４）每天补充４００μｇＲＥ维生素儿分别在实验初始、第四周末、第六周末和第八周末抽血测定。在实验的第七周，将补胡萝卜素的两组改为补维生素Ａ１０００μｇＲＥ、补维生素Ａ组改为补６ｍｇ的β－胡萝卜素。对照组（ｎ＝１８）给予安慰剂。结果显示：每天摄入营养素推荐摄入量（ＲＤＡ）剂量和２倍ＲＤＡ剂量的β－胡萝卜素，对于提高机体维生素Ａ、β－胡萝卜素水平的效果是相同的，而直接补充维生素Ａ，机体维生素Ａ、β－胡萝卜、素水平略高于补胡萝卜素组。本研究探讨了我国青少年确实的营养状况，也提示维生素Ａ在维生素Ａ营养中具有胡萝卜素不可替代的作用。

THE EFFECT ON THE STORAGE LEVEL OF BODY VITAMIN A OF ADOLESCENT IN RURAL AREA BY SUPPLEMENTING VITAMIN A BETA-CAROTENE

This article researches on supplement of vitamin A and beta-carotene.The 82subjects in a middle school in rural area were tandemly sampled.The students aged 12～15 yeasold and weighted 35～45 kg.The test group 1(n=21)supplemented 2 mg beta-carotene a dayand group 2 n=19) 6 mg beta-carotene a day and group 3(n=24)400 μg RE vitamin A aday.The blood was drawn at the begining of this experiment,the forth week-end,the sixthweek-end and the eighth week-end,seperatly. At the seventh week of the experiment,the twogroups supplying carotene were changed to supply 1000μg RE vitamin A everyday.The groupof supplying vitamin A was changed to supply 6mg beta-carotene a day.The control group(n=18)are given placebo. The result present:ingesting the dose of RDA a day have the same effecton improving body vitamin A and beta-carotene level as ingesting beta-Carotene two times morethan the dose of RDA. However the body vitamin A and beta-carotene level of the group thatsupply vitamin A directly is a little higher than that of the group that supply beta-carotene. Theresearch discusses the exact nutrition status of adolescent in our country,It also presents that vi-tamin A have the impotant role in the vitamin A nutrition that carotene can not replace.