Quick Answer
Some people taste soap when they eat coriander due to a gene that makes them sensitive to its chemical compounds. This is interesting because it highlights how our genetics can profoundly alter our sensory experiences, transforming a familiar herb into something utterly unpalatable for nearly one in five of us.
In a hurry? TL;DR
- 1About 20% of people find coriander tastes like soap due to a specific gene variation (OR6A2).
- 2This genetic trait causes the brain to perceive aldehydes in coriander as soapy or dirty.
- 3The OR6A2 gene detects aldehydes, which are also found in soaps and detergents.
- 4This genetic difference explains the strong, divisive opinions on coriander's flavor.
- 5Understanding this shows how DNA influences personal taste and perception.
- 6Prevalence varies by ethnicity, with lower rates in South Asian and Middle Eastern populations.
Why It Matters
It's surprising that for one in five people, coriander, a common herb, genuinely tastes like washing-up liquid due to a specific genetic quirk.
Around 20 percent of the population possesses a specific genetic variation that transforms the citrusy, herbal flavour of coriander into the distinct taste of dish soap or bath bubbles. This sensory divide is not a matter of being a picky eater, but a hardwired biological response to the plant's chemical makeup.
The Quick Answer
For roughly one in five people, coriander tastes like soap due to a variation in the OR6A2 gene. This gene detects aldehydes—organic compounds found in both the herb and various detergents—causing the brain to register a flavour profile that signals danger or inedibility.
Key Facts and Figures
- Prevalence: Between 4 percent and 21 percent depending on ethnicity
- Primary Culprit: The OR6A2 olfactory receptor gene
- Chemical Trigger: E-2-alkenals and (E)-2-dodecenal
- Genetic Location: Chromosome 11
- Cultural Divide: Lowest prevalence in South Asian and Middle Eastern populations
Why It Matters
Understanding the coriander debate reveals that our perception of the world is not a universal truth, but a subjective interpretation filtered through our DNA. It provides a rare, tangible example of how a single genetic tweak can dictate our social interactions and culinary preferences.
The Discovery: Mapping the Soap Gene
The link between DNA and coriander aversion moved from dinner party anecdote to scientific reality thanks to a massive study by the personal genomics company 23andMe. In 2012, researchers led by Nicholas Eriksson surveyed 14,000 participants about their feelings toward the herb and compared their answers to their genetic profiles.
They identified a single nucleotide polymorphism—a tiny variation in the genetic code—located within a cluster of olfactory receptor genes. Specifically, the OR6A2 gene encodes a receptor that is highly sensitive to the aldehyde chemicals that give coriander its scent.
The Chemistry of Disgust
Coriander contains a variety of aldehydes, but the ones responsible for the soapy sensation are unsaturated aldehydes called alkenals. To the majority of the population, these chemicals contribute to a complex, refreshing aroma. However, for those with the genetic variation, these compounds dominate the palate.
Unlike other herbs, the aromatic profile of coriander is particularly volatile. According to research from the University of Toronto, those with the soap gene perceive these specific chemicals more intensely. While others might taste a balance of lime and pepper, the soap-taster's brain ignores the nuances and focuses entirely on the soapy aldehydes.
Nature vs Nurture: Can You Overcome It?
The genetic predisposition is powerful, but it is not necessarily a life sentence. Neuroscientists suggest that the brain can be trained to override the soap signal through repeated, positive exposure.
Julia Child, the iconic American chef, famously despised coriander, yet many professional cooks find that their aversion fades as they incorporate the herb into different contexts. Crushing the leaves is one effective strategy; physical damage to the plant tissue releases enzymes that break down the offensive aldehydes into milder, less soapy compounds.
Practical Applications
- The Pestle Method: If you are cooking for a mixed group, use a pestle and mortar to grind the coriander into a paste. This accelerates the breakdown of aldehydes before the dish reaches the table.
- Substitution Strategies: For those who cannot tolerate the herb, flat-leaf parsley mixed with a squeeze of lime juice provides a similar visual and acidic profile without the soapy aftertaste.
- Genetic Testing: Coriander preference has become a standard example in genetic education, often used to demonstrate how slight mutations impact human behaviour and preference.
Interesting Connections
- Etymology: The word coriander is derived from the Greek koris, meaning bedbug. This is because the herb’s crushed leaves were thought to smell like the pungent odour of the insect.
- Genetic Cousins: The OR6A2 gene is part of a larger family of receptors that detect everything from the smell of fresh-cut grass to the scent of rain on dry earth.
- Complementary Chemistry: Coriander is often paired with spicy ingredients like chilli; the heat of the capsaicin can sometimes distract the palate from the soapy notes of the herb.
Key Takeaways
- Genetic Reality: Coriander aversion is a biological trait, not a personality flaw or fussy eating.
- Chemical Trigger: The OR6A2 gene makes certain people hypersensitive to aldehydes common in both coriander and soap.
- Ethnic Variation: The prevalence of the gene varies significantly across different global populations.
- Culinary Workaround: Crushing or mincing the leaves can help neutralise the soapy taste by breaking down the volatile compounds.
