香蕉长了黑点还能吃吗？

2018-05-28 10:05:05家庭医生在线钟吉怡查看次数：241

　　我们都知道，香蕉富含多种维生素和营养物质，是相当好的营养食品。并且一年四季可收获，还有很多人靠吃香蕉减肥。是非常受欢迎的水果之一。但是，香蕉在放久了之后总是会长出一些难看密集的斑点，让人觉得这根香蕉好像“发霉”了一样，不敢吃。到底是为什么香蕉身上会长出奇怪的斑点呢？

　　对于香蕉的黑斑，有以下几点说法。首先，我们应该先了解到香蕉皮的表皮中含有一种极易被空气中的氧气所氧化的物质，叫氧化酵素。这种物质本来是一直封存在香蕉的表皮细胞中。但是，当香蕉放久了，也可以说是熟透了，细胞就会萎缩破解，氧化酵素就会跟氧气反应，生成一种黑颜色的化学物质。所以，香蕉长黑斑只是正常现象，代表香蕉放久了或者已经成熟。

　　此外，香蕉的黑斑也是其糖分充足的体现，吃起来香甜不涩。香蕉在黄澄澄，表皮有深色小斑点密布（俗称芝麻焦）的时候是最好吃的。另外，还有人说是香蕉产生的黑斑是其退化的种子，因为香蕉是三倍体，没有种子进行栽种繁殖。

　　还有一种说法是香蕉在冰冻之后放入室温中，或者是运输过程中的物理碰撞影响表皮正常形态，都有可能产生黑斑。但是这种物质会不会对人体有害呢？

　　答案是并没有。众所周知，香蕉皮具有防癌的作用，但很少有人知道，发黑的香蕉皮防癌作用更大。日本有研究人员通过研究发现了，香蕉中含有能排解人体内毒性物质，并且能提高免疫力的物质。并且能促进人体产生白血球，增加白血球活性。而放久外皮发黑的香蕉效果更佳，是新鲜香蕉的五倍，并且含有丰富的钾元素。因此说，外皮发黑的香蕉更具抗癌功效。而且，发黑只是因为香蕉的表皮细胞氧化所致，对其表皮包裹的果肉并无影响，可以放心食用。

　　若是香蕉内部发黑发臭，请不要继续食用了。有的香蕉过于成熟，表皮发黑程度严重，并且果肉也有腐烂情况的，已经不适宜再吃了。大家在挑选香蕉的时候也应该注意，不要挑选果皮过软、黑斑过多的香蕉，说明很快就要过熟了。并且香蕉买回来应该放在空气流通的地方，这样存放的时长才能更久。

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香蕉长了黑点还能吃吗？

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