Diaper changing is a daily routine for new parents.
Ian Allenden/Alamy Stock Photo
Parents don't easily develop aversions, but only after the child starts eating solid foods. The level of disgust that parents experience appears to change over time, which may have evolved to protect their children and prime their immune systems.
Disgust probably evolved as a kind of “behavioral immune system” as a way to avoid pathogens in feces and vomit. Hannah Berg from the Laureate Brain Institute in Tulsa, Oklahoma, was not involved in the new study.
Source: www.newscientist.com
