How Onions Make Us Cry: Unraveling the Chemistry Behind the Tears


When cutting onions, it is common for many people to experience tearing or crying. This happens due to a chemical reaction that occurs when you cut into an onion.

Onions contain a compound called alliinase, which is an enzyme stored in the onion's cells. When you slice or chop an onion, it breaks open the cells, releasing the alliinase. This enzyme then comes into contact with another compound called alliin, which is also present in the onion.

When alliinase and alliin combine, they form a volatile gas called syn-propanethial-S-oxide. This gas is released into the air and can irritate the eyes and nasal passages. When the gas reaches your eyes, it stimulates the sensory nerves, causing your eyes to produce tears as a natural defense mechanism.

Additionally, the sulfur compounds in onions can also cause a stinging sensation, further contributing to the tearing response.

There are a few strategies you can try to minimize tears while cutting onions. These include:

1. Chilling the onion: Try refrigerating the onion or placing it in the freezer for a few minutes before cutting. Cold temperatures can slow down the release of the irritating compounds.

2. Cutting near running water: Running water can help to wash away the gas released from the onion, reducing its contact with your eyes.

3. Wearing goggles or glasses: Protective eyewear can create a barrier between your eyes and the onion's gases, preventing them from reaching your eyes.

4. Using a sharp knife: A sharp knife causes less damage to the onion's cells, reducing the amount of gas released.

Although these methods can help, they may not completely eliminate tearing. Each person's sensitivity to the compounds in onions can vary, so some individuals may still experience tears despite taking precautions.

There is some anecdotal evidence suggesting that chewing gum while cutting onions can help reduce or prevent crying. However, there is limited scientific research specifically addressing this claim.

One theory behind this idea is that chewing gum promotes breathing through the mouth rather than the nose, reducing the amount of onion gas that reaches the nasal passages and eyes. Chewing gum may also increase saliva production, which could potentially help to neutralize or dilute the irritating compounds.

While there is no definitive scientific evidence to support the effectiveness of chewing gum in reducing onion crying, it may be worth trying as a simple and harmless method. Different people may have varying experiences, so it could work for some individuals but not for others.

If you find that chewing gum helps alleviate the discomfort or tears when cutting onions, then it can be a useful technique for you personally. However, if you still experience significant tearing, you may want to consider other strategies such as using a sharp knife, cutting near running water, or chilling the onion as mentioned earlier.

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