PPT《社区营养Community Nutrition》

61人摄入量高于13.5mg/d(RNI) 占13.3%;

218人在9.7-13.5mg/d之间,占56.6%. 试评价该人群的锌摄入水平. 动物实验研究(Animal experimental study)人体代谢研究(Human metabolism study)人群观察研究(Human following up study) 随机性临床实验研究(clinical &

experimental study at random) 确定营养素需要量的方法Methods determining nutrients requirement Initial studies usually are conducted with laboratory animals, but the information developed in these studies cannot be applied directly to humans since people'

s needs often are quite different from animals'

needs. Advantages: 可以控制营养素摄入水平、环境条件,甚至遗传特性等,数据准确.Disadvantages: 动物和人体需要的相关性可能不清楚,作用动物的剂量水平和给予途径可能对人类不适用. 确定营养素需要量的方法―动物实验研究 Advantages: 能严格掌握营养素的摄入和排出,能重复取样,以测定营养素摄入量和有关生物标志间的关系.Disadvantages: 实验期限较短,难以确定是否可将所得结果应用于长期情况;

受试对象的生活受到限制,所得结果........