Why Do Onions Make You Produce Tears When Cutting Them?

2026-06-06 03:03:56
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3 Answers

Tessa
Tessa
Active Reader Driver
Kitchen nightmares: onion edition. The moment my knife hits that first layer, it’s like a tiny chemical warfare lab activates. Onions store amino acid sulfoxides in their cells, and when you rupture them, enzymes convert these into volatile sulfur compounds. The gas hits your cornea, triggering your lachrymal glands to go into emergency rinse mode.

I read somewhere that sweet onions or chilled ones might be less tear-inducing, but let’s be real—it’s a gamble. My grandma swore by breathing through her mouth while cutting, claiming it reduced the fumes reaching her eyes. Didn’t work for me, though. The only semi-reliable trick I’ve found is using a sharp knife to minimize cell damage, but even then, by the third onion, I’m blinking like I just watched the finale of 'This Is Us.'
2026-06-09 12:23:35
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Mason
Mason
Honest Reviewer Student
Ever wondered why chopping onions feels like a mini emotional breakdown? It’s all down to chemistry, but not the romantic kind. Onions contain sulfur compounds that mix with enzymes when you slice through their layers, creating a pesky gas called syn-propanethial-S-oxide. This little troublemaker floats up and reacts with the water in your eyes, forming sulfuric acid—yep, the same stuff in batteries, just way milder. Your eyes panic like they’ve been betrayed, flooding with tears to wash it away.

Funny thing is, the onion’s defense mechanism is meant to deter pests, not reduce humans to sniffly messes. I’ve tried all the 'hacks'—freezing onions, cutting near running water, even wearing goggles (which made me look like a mad scientist). None are foolproof, but chewing gum while cutting somehow distracts me from the impending waterworks. Maybe it’s the chewing motion keeping my sinuses busy? Either way, onions win every time.
2026-06-11 09:16:12
1
Ella
Ella
Library Roamer Data Analyst
Onion tears are basically a science experiment on your cutting board. When you slice into one, you break cells that release enzymes and sulfenic acids. These combine to form that infamous tearjerker gas. Your eyes, being the drama queens they are, interpret this as an attack and start flushing out the irritant.

I used to think red onions were gentler until I sobbed through a batch last week. Now I just embrace the catharsis—sometimes you need an excuse to cry over something that isn’t existential dread.
2026-06-12 17:52:59
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