Why Onions Make You Cry

Dramatic cinematic portrait movie poster, 1024x1536, with the title text 'WHY DO ONIONS MAKE YOU CRY?' in LARGE, BOLD, fully legible letters across the top quarter, and below it a vivid close-up of hands slicing a white onion on a cutting board, with a sharp emotional kitchen scene, high contrast, realistic lighting, the only text in the image is the title.

Cutting an onion breaks its cells, letting enzymes and sulfur compounds mix.

A person slicing an onion into thin, even slices on a wooden cutting board.

cutting an onion into rings

slicing an onion on a cutting board

That reaction makes syn-propanethial S-oxide, a vapor that reaches the eye and stings it.

Can I completely stop onions from burning my eyes

All about onions, your eyes and how to turn off the tears

wearing onion goggles while cutting onions to stop burning eyes

When it touches the moisture on your eye, your brain tells the tear glands to wash it away.

Eyes tearing up close up

So onion tears are your eye's quick cleanup reflex.

Why do onions make you cry?

Cutting an onion breaks its cells, letting enzymes and sulfur compounds mix.
That reaction makes syn-propanethial S-oxide, a vapor that reaches the eye and stings it.
When it touches the moisture on your eye, your brain tells the tear glands to wash it away.
So onion tears are your eye's quick cleanup reflex.

Why Onions Make You Cry

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