在发展中国家和地区，居民之间的膳食结构差异很大，营养不良和营养过剩问题同时存在。特别是经济高速发展的低收入国家和地区，这类问题更加明显。我国正处于这一阶段。实行改革开放以来，我国工农业生产，特别是农业生产发展很快，随着人们经济收入的不断提高，必定会影响他 In developing countries and regions, the dietary structure among residents varies greatly, and malnutrition and overnutrition coexist. Especially in the low-income countries and regions where the economy is developing rapidly, such problems are even more obvious. My country is at this stage. Since the introduction of the reform and opening up, the industrial and agricultural production in our country, especially agricultural production, has developed rapidly. As people’s economic income continues to rise, they will certainly affect him