一患儿半年来视力有些下降,家长听说维生素A对眼睛有好处,就每日给孩子吃一两粒维生素A胶囊。没想到,半年来视力未见好转,却导致维生素A中毒,好在停药后1～2周,症状即可基本消除。维生素是维持正常生理代谢和生理功能所必需的物质,人体又不能自己合成,故需摄入。但有相当一部分人把维生素当成补药,认为多吃无妨,而且有益健康。其实,人体每日对维生素的正常需 A child’s vision for some six months decreased, parents heard that vitamin A is good for the eyes, to eat one or two capsules of vitamin A daily. Unexpectedly, vision has not improved for six months, has led to vitamin A poisoning, but good for stopping 1 to 2 weeks after the symptoms can be basically eliminated. Vitamin is necessary to maintain normal physiological metabolism and physiological function of the material, the body can not synthesize their own, it is necessary intake. However, a considerable number of people regard vitamins as a tonic and think that it is good to eat more and be wholesome. In fact, the body’s daily normal demand for vitamins