大多数维生素不能在体内合成,或不能大量在组织中储存,必须经常由食物提供。老年人由于代谢和免疫功能降低,对各种维生素的撮入必须充足。又由于老年人进食量下降,摄入的维生素也相应减少,但各种维生素的摄入不能减少,至少与成年人相同,因此更要注意进食富含维生素的食物,或适量补充维生素补充剂。维生素是一类人体几乎不能自身合成,而必须从食物中获取的营养素。维生素的人体需要量从数量上看很小,不参与身体的组成,也不提供能量,但在物质代谢中发挥重要作用。如果缺乏维生素,可导致各种缺乏病 Most vitamins can not be synthesized in the body, or can not be stored in large quantities in tissues and must often be provided by food. Older people due to reduced metabolism and immune function, the various vitamins must be adequate summary. And because of the lower intake of the elderly, intake of vitamin is also reduced, but the intake of various vitamins can not be reduced, at least as adults, so pay more attention to eating foods rich in vitamins, or adequate vitamin supplements. Vitamins are nutrients that a human body can hardly synthesize by itself and must obtain it from food. Vitamin requirements of the human body is small in terms of quantity, does not participate in the composition of the body, nor provide energy, but plays an important role in the material metabolism. Lack of vitamins can lead to a variety of deficiencies