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生活水平好了,膳食结构也跟着改变了,一个很突出的表现就是三餐中的主食。很多人特别是城市居民,每天吃的都是精致大米白面,饭是白了,脸却黄了。粗粮似乎被人们遗忘了,事实上,食物在加工过程中伴有维生素的损失,比如谷物在精制过程中B族维生素损失较多,此外一些必需微量元素的丢失也很可观。所以无精不吃的习惯要改改了,粗粮细粮都是好粮食,不要再厚此薄彼了。