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cover of episode Why does cutting onions make you cry?

Why does cutting onions make you cry?

2025/3/17
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Moment of Um
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Kenji Lopez-Alt
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Kenji Lopez-Alt: 切洋葱让人流泪的原因是洋葱自身的一种防御机制。洋葱中含有一种叫做催泪因子的化学物质，这些物质并非天生存在于洋葱中，而是在我们切开洋葱后才产生的。催泪因子是一种硫基化合物，它会刺激我们的眼睛，导致我们流泪。 催泪因子的产生数量取决于你切洋葱的方式。如果你使用一把钝刀，它会压碎许多洋葱细胞，从而产生更多的催泪因子。相比之下，使用锋利的刀子可以干净利落地切开细胞，减少催泪因子的产生。 为了避免切洋葱时流泪，你可以采取以下几种方法：使用锋利的刀子，快速切洋葱，冷藏洋葱以减缓化学反应速度，或者戴上泳镜来完全阻挡催泪因子与眼睛接触。 此外，将洋葱浸泡在水中也可以减少其辛辣味。浸泡可以溶解一部分催泪因子，使洋葱的味道更甜，减少辛辣感，尤其适用于生食洋葱。

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Onions add zesty flavor to lots of different foods, like soups, salads, omelets, and much more! But sometimes, chopping them up can make your eyes water – ugh! Why does that happen, anyway? We asked chef and cookbook author Kenji Lopez-Alt to help us find the answer.

Got a question ON-ion your mind? Send it to us at BrainsOn.org/contact) and we’ll find such a great answer, you’ll *weep for joy! *