各种食物都有其独特的属性,有些食物寒凉、有的温热,各种食物的食用效果都不同。蔬菜也是一样,所以各种各样属性不同的蔬菜能够帮助人体补充到各方面的营养所需。但是蔬菜的属性那么复杂也很容易搭配出 “怨偶”。食用、搭配不当的食物之间可能产生出变化,让有营养的食物都变成了毒药,甚至在体内产生致癌物质!下面我们来看一下那些食用方法是错误的!
一、胡萝卜素补充过量
我们知道胡萝卜素可以减少心血管疾病及白内障的发生,而且有防癌作用。但是,尽管胡萝卜素对人体很有好处,也要注意适量食用。
过多地摄入胡萝卜素的一个显著病症就是面部和手部皮肤变成橙黄色,然后还会出现食欲不振、精神状态不稳定、烦燥睡眠、说梦话等表现。但有这些症状出现的时候就要注意了,因为近期的的研究表明,过量摄入胡萝卜素,会导致肺癌的发病率提高。因此,只需在平时食用适量的动物肝脏、牛奶、胡萝卜、韭菜或者茶叶就可以达到补充人体所需胡萝卜素的目的。
二、苦瓜没有焯过水
很多人喜欢在吃苦瓜前将苦瓜先焯焯热水,去掉苦味。而有些人觉得麻烦就直接烹煮没有经过任何处理。其实,焯苦瓜的做法是值得提倡的,因为苦瓜中所含的草酸会妨碍食物中的钙吸收。吃之前把苦瓜放在沸水中焯一下,就可以去除草酸。另外,需要补充大量钙的人不能吃太多的苦瓜。
三、菠菜过量吃
与苦瓜一样,菠菜中含有大量草酸,草酸在人体内会与钙和锌生成草酸钙和草酸锌,不易吸收排出体外,影响钙和锌在肠道的吸收,容易引起缺钙、缺锌,导致骨骼、牙齿发育不良,还会影响智力发育。所以也要注意一下菠菜的食用量。
四、隔夜的韭菜继续吃
有关注食物养生的人知道,近年来讨论得比较多的一个话题就是,隔夜菜致癌的问题。其实隔夜菜不一定会致癌,但是有些蔬菜经过烹煮之后会产生另外的一些物质,这些蔬菜如果食用就会对人体产生危害。而韭菜一旦隔夜就会变成毒,因为烹煮过后,韭菜中大量的硝酸盐会转变成亚硝酸盐,引起毒性反应。同时,消化不良也不能吃韭菜。所以韭菜最好现做现吃,不能久放。
五、豆芽菜未炒熟
豆芽是由豆类、谷类等种子培育出来的蔬菜,虽然它质嫩鲜美,营养丰富,但吃的时候一定要炒熟。否则食用过后会出现恶心、呕吐、腹泻、头晕等不适反应。
六、爱吃凉拌菜
蒜泥拍黄瓜、凉拌绿豆芽、木耳香莴笋、酸辣萝卜丝等,这些色彩诱人味道刺激的凉拌菜无论什么时候都能调动人们的食欲。但是吃太多的凉拌菜对身体绝对不好,因为蔬菜在生长过程中很容易被土壤中的细菌、病毒和寄生虫卵所污染;夏季相对病虫害活跃,蔬菜农药残留超标概率也较大。而且,很多食物中含有人体体温不能转化的物质,加上调料的刺激性大很可能会把蔬菜中的营养素破坏掉,所以,凉拌菜还是少吃为妙。
七、胡萝卜跟萝卜混着吃
胡萝卜色彩艳泽,所以人们经常在做菜的时候放进一点作为辅料,增加食物的色彩。特别是跟白萝卜煮在一块。觉得这样好吃又营养,其实,胡萝卜跟白萝卜还是不能混在一起吃的。因为,胡萝卜中含有能够破坏维生素C的酵素,会把萝卜中的维生素C完全破坏掉。
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