天然食物里的beta-胡萝卜素和维生素片里的VA是不一样的。。。 只有后者的剂量需要控制,否则你吃一小片红薯肯定都狂超标了。。。 具体解释在这里: http://www.babycenter.com/0_vitamin-a-in-your-pregnancy-diet_675.bc "It's important during pregnancy not to get too much of the preformed vitami n A, which in high doses can cause birth defects and liver toxicity. (You ca n take in as many carotenoids as you want, however, from fruits and vegetabl es.)"