why do cashews make you cry
The Short AnswerCashews themselves don't make you cry, but their raw shells contain urushiol, the same irritating oil found in poison ivy. During processing, this oil can become airborne as a vapor or dust, irritating the eyes and respiratory tract of workers. The cashews you eat have been thoroughly steamed or roasted to remove this toxin.
The Deep Dive
The cashew nut is not a true nut but a seed that grows externally on the cashew apple. It is encased in a hard, double-layered shell. Between these layers lies a caustic phenolic resin called urushiol. This oil is a potent allergen and irritant, famous for causing the itchy rash from poison ivy. When cashews are cracked open for processing, the urushiol can be released as fine particles or vapors. Industrial facilities use sophisticated methods like steaming, roasting, or boiling to neutralize the urushiol before the edible kernel is ever extracted. This process not only detoxifies the nut but also loosens the shell for easier removal. Workers in less regulated facilities, however, can be exposed to the raw irritant, leading to severe eye and skin irritation, which is the origin of the 'crying' phenomenon. The cashews sold to consumers have undergone this critical safety step.
Why It Matters
Understanding this process is crucial for food safety and worker protection. It explains why cashews are never sold in their raw, in-shell form like peanuts or almonds. For consumers, it guarantees that the cashews they purchase are safe to handle and eat. For the food industry, it underscores the importance of strict processing protocols to protect employees from occupational hazards. This knowledge also helps appreciate the global supply chain effort that makes this popular snack accessible and safe.
Common Misconceptions
A common myth is that eating cashews can make you cry or cause an allergic reaction similar to poison ivy. This is false; the urushiol is completely destroyed by the high-heat processing required to make them edible. Another misconception is that 'raw' cashews sold in stores are truly unprocessed. In reality, all commercially available cashews have been heat-treated to some degree to remove the shell oil; 'raw' simply means they haven't been further roasted or salted for flavor.
Fun Facts
- The cashew tree is related to poison ivy, poison oak, and poison sumac, all of which contain urushiol.
- In some traditional practices, the caustic cashew shell oil was used to waterproof wood and even as an insecticide.