Li Ya Jie, Li Min, Liu Xiao Bing, Ren Tong Xiang, Li Wei Dong, Yang Chun, Wu Meng, Yang Lin Li, Ma Yu Xia, Wang Jun, Piao Jian Hua, Yang Li Chen, Yang Xiao Guang
Key Laboratory of Trace Element Nutrition, National Health and Family Planning Commission of China, Department of Trace Element Nutrition, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China.
National Institute of Metrology, Beijing 100029, China.
Biomed Environ Sci. 2017 Jun;30(6):391-397. doi: 10.3967/bes2017.052.
To determine the dietary zinc absorption in a Chinese elderly population and provide the basic data for the setting of zinc (Zn) recommended nutrient intakes (RNI) for Chinese elderly people.
A total of 24 elderly people were recruited for this study and were administered oral doses of 3 mg 67Zn and 1.2 mg dysprosium on the fourth day. The primary macronutrients, energy, and phytic acid in the representative diet were examined based on the Chinese National Standard Methods. Fecal samples were collected during the experimental period and analyzed for zinc content, 67Zn isotope ratio, and dysprosium content.
The mean (± SD) zinc intake from the representative Chinese diet was 10.6 ± 1.5 mg/d. The phytic acid-to-zinc molar ratio in the diet was 6.4. The absorption rate of 67Zn was 27.9% ± 9.2%. The RNI of zinc, which were calculated by the absorption rate in elderly men and women, were 10.4 and 9.2 mg/d, respectively.
This study got the dietary Zn absorption in a Chinese elderly population. We found that Zn absorption was higher in elderly men than in elderly women. The current RNI in elderly female is lower than our finding, which indicates that more attention is needed regarding elderly females' zinc status and health.
测定中国老年人群的膳食锌吸收情况，为制定中国老年人锌推荐营养素摄入量（RNI）提供基础数据。
本研究共招募24名老年人，在第4天口服3毫克67锌和1.2毫克镝。根据中国国家标准方法检测代表性膳食中的主要宏量营养素、能量和植酸。在实验期间收集粪便样本，分析锌含量、67锌同位素比率和镝含量。
中国代表性膳食的平均（±标准差）锌摄入量为10.6±1.5毫克/天。膳食中植酸与锌的摩尔比为6.4。67锌的吸收率为27.9%±9.2%。根据老年男性和女性的吸收率计算出的锌RNI分别为10.4和9.2毫克/天。
本研究得出了中国老年人群的膳食锌吸收情况。我们发现老年男性的锌吸收高于老年女性。目前老年女性的RNI低于我们的研究结果，这表明需要更多关注老年女性的锌状况和健康。
