营养素的需要量和供给量是二个不同的概念,它们有联系又有区别。需要量是指某种营养素在维持身体正常生理功能所需要的数量,低于这个数量,将有损于身体健康。供给量是指能维持大多数健康人良好营养状态的适宜数量。所以它比需要量高,而比患病时或缺乏病修复期所需量为低。它是随生产和生活条件改变,以及营养科学的发展而不断修订的,国外 Nutrient demand and supply are two different concepts, they are linked and different. Requirement refers to the amount of nutrients needed to maintain the normal physiological function of the body, below this amount, will be detrimental to their health. Supply is the appropriate amount to maintain the good nutritional status of most healthy people. So it is higher than the requirement and lower than the amount needed for illness or lack of recovery. It is constantly changing with the production and living conditions, as well as the development of nutrition science, foreign