Why do onions make us cry when we cut them, but not when we eat them?

Question

I was helping my mom in the kitchen today, and when I started chopping onions, my eyes started stinging and tearing up. But then I realized something weird – when we eat onions in our food, they don’t make us cry at all!Can someone explain why onions make us cry when we cut them

In: Other

Answer 1

Tip: I put a small fan on the counter, directed at the onion, to redirect the onion vapor and that helps my eyes not sting!