why do eggs make you cry
The Short AnswerEggs themselves do not possess any chemical compounds that would cause human eyes to produce tears. The act of crying while preparing eggs is almost universally attributed to the irritation caused by cutting onions or other pungent ingredients often used in conjunction with eggs, not the eggs themselves.
The Deep Dive
The phenomenon of tears streaming down one's face is a physiological response to irritation, often triggered by specific volatile chemical compounds. When it comes to food, the most common culprit for this reaction is the onion. Onions contain sulfur-rich amino acid sulfoxides, which, when the onion is cut, are converted by an enzyme called alliinase into sulfenic acids. These sulfenic acids then spontaneously rearrange to form syn-propanethial-S-oxide, a volatile sulfur compound that diffuses into the air. When this compound reaches the eyes, it reacts with the water in the lacrimal glands to form sulfuric acid, a mild irritant. The eyes then produce tears to flush out this irritant. Eggs, however, are primarily composed of proteins, fats, and water, along with various vitamins and minerals. They do not contain any enzymes or precursor compounds that would generate syn-propanethial-S-oxide or any other known lachrymatory (tear-inducing) agent. Therefore, the act of cracking, whisking, or cooking eggs does not release any substances capable of irritating the eyes and triggering tear production.
Why It Matters
Understanding which specific compounds in foods cause irritation helps us appreciate the diverse chemical makeup of what we eat and how our bodies react. This knowledge can improve cooking techniques, such as using sharp knives for onions to minimize cell damage and lachrymatory factor release, or chilling onions before cutting them. It also clarifies common kitchen experiences, preventing misattribution of symptoms to harmless foods. For individuals with food sensitivities, differentiating between a true allergic reaction and a simple irritant response is crucial for health and safety, ensuring proper dietary choices and medical attention when necessary.
Common Misconceptions
A prevalent misconception is that eggs somehow possess a quality that makes people cry. This is incorrect; eggs are not lachrymatory agents. The confusion almost always stems from the fact that eggs are frequently cooked alongside or immediately after cutting onions, garlic, or chili peppers, which are well-known irritants. Another misunderstanding might arise if someone experiences an allergic reaction to eggs, which can cause symptoms like watery eyes, but this is an immune response, not a direct irritant effect causing tears in the same way onions do.
Fun Facts
- The enzyme responsible for creating the tear-inducing compound in onions, alliinase, is deactivated by cooking, which is why cooked onions don't make you cry.
- Some scientists have developed 'tearless' onions by using genetic modification or breeding techniques to suppress the enzyme that produces the lachrymatory factor.