维生素是维持人体健康所必须的一类营养素,本质为低分子有机化合物,它们不能在体内合成,或者所合成的量难以满足机体的需要,所以必须由食物供给。它们既不是构成机体组织的原料,也不是体内供能的物质,然而在调节物质代谢、促进生长发育和维持生理功能等方面却发挥着重要作用,如果长期缺乏某种维生素,就会导致各种疾病。 Vitamins are necessary nutrients to maintain human health, the nature of low molecular weight organic compounds, they can not be synthesized in the body, or the amount of synthesis is difficult to meet the needs of the body, it must be supplied by food. They are neither the raw materials that make up the body tissues nor the substances that can be supplied by the body, but play an important role in regulating the metabolism, promoting the growth and maintaining the physiological functions. If the lack of certain vitamins for a long time causes various kinds of vitamins disease.