The study, which tracked more than 500 Spanish girls between the ages of 7 and 10, links the presence of certain fungicides in urine to early menarche and that of the insecticide chlorpyrifos to delayed menarche, highlighting the impact of pesticides on pubertal development.

Puberty is a process regulated by the endocrine system, and its timing can be altered by environmental factors. Several recent studies point to a trend toward earlier onset of puberty in girls, a phenomenon ...