营养需要量是指保持正常机体于各种不同营养水平时满足生理必需的各种营养素的数量。它是制订供给标准的依据。各国的人口与经济,农业生产和食品工业情况等不同,应有符合各自情况的供给标准,并随国家经济发展而完善。有的营养学家主张能预防缺乏病出现的量就是正常的生理需要量 Nutritional requirements are the amount of various nutrients that are required to maintain the physiological needs of a normal body at various levels of nutrition. It is the basis for the development of supply standards. In different countries, population and economy, agricultural production and the food industry, etc., should have different supply standards in line with their respective circumstances and should be perfected with the national economic development. Some nutritionists advocate that the amount of deficiency that can be prevented is the normal physiological requirement