This is the reason we always cry when slicing onion

News24xx.com - Because it can make the eyes watery, many people are reluctant to peel a large number of shallots or onions. In fact, the tears that fall off when we're cutting onions are reflex tears caused by some kind of external irritation.

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Quoted in the Metro, December 8th 2018, reflex tears are different from basal tears that usually come out when we are crying. Basal tears have the function as eye lubricants, while for reflex tears are different from tears triggered by emotions. Reflex tears are released from the tear glands that receive signals from the brain to do so if your eyes need to remove 'foreign' objects such as dust or smoke.

When sliced, the cells in shallots or onions will break and release enzymes and produce gas called propanethialsulphoxide. When this gas hits the eye it will react with tears and produce acid called sulfuric acid in mild conditions. This substance is recognized by the brain as a foreign object.

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To make you don’t cry while slicing onions, you need to know this trick. One way you can do this is to slice onions under water to prevent the sulfate to reach your eyes. You can also cut onions under cold running water. And you can also cut the onion near the open vent so that the wind will help blow sulfuric compounds away from your eyes.

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