Myth and Facts: Why does chopping onion make you cry?

Myth and Facts: Why does chopping onion make you cry?

When we chop a fresh onion, a chemical called syn-propanediol-S-oxide is produced. When it reaches the eye, it’s mixed with the eye’s water and form a sulfenic acid which stimulates the eye. To wash away this irritation the eye’s lachrymal glands producing tears.

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