西兰花和胡萝卜比猪肝更护眼

(2010-09-28 11:19:47)
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69d4ec0e77f614cd196d5505109e2f87.jpg

  很多人为了“明目”而经常摄入猪肝,还有不少幼儿园规定每周食谱都要吃一、二次猪肝,这些做法的主要理由之一是猪肝富含维生素A。可是,猪肝真的是维生素A的最佳来源吗?

  人体所需的维生素A,除了可以从动物性食物直接摄取外,还可以由植物性食物中的β胡萝卜素转化而来。有充分的证据表明,摄入β胡萝卜素后,其转化为维生素A的效率是充分的,足以满足人体对维生素A的需要。

  而且,最为关键的是,那些没有转化为维生素A的β胡萝卜素还具有其他重要生理功能,它具有抗氧化作用,对预防心血管疾病、肿瘤,以及延缓衰老均有重要意义。换言之,β胡萝卜素不但可以转化为维生素A,还具有维生素A所不具备的抗氧化作用。因此,那些富含β胡萝卜素的食物,如西兰花、胡萝卜南瓜、韭菜、菠菜、西红柿、荠菜、红薯等蔬菜以及柑橘类等水果才是维生素A的最佳来源。

  比较而言,动物肝脏及其他内脏、蛋黄、瘦肉等富含维生素A的食物,含有较多胆固醇或饱和脂肪,而且积累了不少毒素。所以,为护眼而多吃猪肝并不明智。应该多吃新鲜的、深色的蔬菜和水果。

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