What did Persephone eat that proved to be bad for her health?

Persephone ate pomegranate seeds while in the Underworld, which ultimately led to her spending part of each year there. According to myth, consuming the seeds bound her to Hades, as it symbolized her acceptance of her role as Queen of the Underworld. This act resulted in her annual descent to the Underworld, causing the changing seasons on Earth as her mother, Demeter, mourned her absence.