The difference lies in a specific genetic variation in the olfactory receptor OR6A2, which causes certain people to intensely detect the aldehydes present in cilantro, chemical compounds that are also characteristic of soap and some insects.
The Gene Responsible: OR6A2
Human beings have around 400 functional olfactory receptors. The OR6A2 gene encodes a receptor that is especially sensitive to medium-chain aldehydes (mainly decanal and dodecanal). These molecules give cilantro its citrusy, herbaceous aroma, but they are identical to those used by the soap and detergent industry to impart a "clean" fragrance.
Those who carry a genetic variant that expresses this receptor more actively perceive cilantro's flavor as dominated by that soapy note, completely masking the herbaceous nuances that the rest of the population enjoys.
Prevalence and Ethnic Origin
Genomic studies (such as those from 23andMe) estimate that between 4% and 14% of the general population experiences this aversion, although the percentage varies significantly depending on geographic origin:
- European ancestry: ~17%
- African ancestry: ~14%
- Latin American ancestry: ~12%
- East Asian ancestry: ~3-7%
This distribution suggests a possible historical evolutionary pressure, although no clear selective advantage has been confirmed.
It’s Not an Allergy or an Intolerance
It is essential to distinguish this perception from an allergic reaction. Those who detect the soapy taste do not suffer an immune response; their brain simply interprets the chemical signal from the aldehydes as "soap" instead of "herb." Therefore, eating cilantro poses no health risk to these individuals, only an unpleasant gastronomic experience.
Can It Be "Cured" or Can You Get Used to It?
Some chefs and food scientists suggest that crushing or finely chopping the leaves before using them releases enzymes that partially break down the aldehydes, reducing the soapy note. There is also anecdotal evidence that repeated exposure in small doses (for example, in sauces where the flavor is diluted) can achieve a certain neural habituation, although the genetic predisposition itself remains unchanged.
¡Qué fascinante descubrir que mi aversión al cilantro tiene una explicación genética! Ahora entiendo por qué a veces siento ese sabor a jabón. Gracias por compartir esta información tan clara.
Me encanta cómo el artículo conecta la genética con nuestra experiencia cotidiana de los sabores. Es genial aprender sobre el receptor OR6A2 y su papel. Definitivamente seguiré leyendo más sobre estos temas.