A recent study found that exposure to chemicals in make-up, shampoo and other personal care products may cause early puberty for girls.
Researchers at the University of California, California, have shown how chemicals used extensively in household products can affect hormones that support growth and puberty for females.
The researchers, published in the journal Human Reproduction, examined the chemical groups found in personal care products such as phthalates, parabens and phenols using urine tests.
The results found that girls who started early adulthood were those whose mothers were exposed to these substances, found in some handwashing liquids and anti-bacterial toothpaste.
Phthalates are used in perfumed products, such as perfumes, deodorants and soaps, while paraben is a preservative found in cosmetics. Phenols are used in all care products ranging from lipstick to skin lotion.
"We found evidence that some of the chemicals that are widely used in personal care products are related to the early age of girls," said Dr. Kim Harley, associate professor of public health at the University of California, who led the study.
"Specifically, we found that mothers with high levels of chemical diethyl phthalate in their bodies during pregnancy, which are used in perfume, triclosan, antibacterial in some types of soap, and toothpaste, were exposed to early puberty."
"We also found that girls with high levels of parabens in their bodies at the age of nine began adulthood at an early age," Harley said.
Researchers from the University of California followed samples of about 200 girls from birth to adolescence and looked for signs of puberty every nine months between the ages of 9 and 13 and their mothers in a long-term study between 1999 and 2000.
"This is important because we know that the age of puberty for girls has changed in the last few decades. One hypothesis is that chemicals in the environment play a prominent role, and our results support this idea," Harley said. Girls have a risk of mental and behavioral health problems in adolescents and increases the risk of breast and ovarian cancer over the long term. So this is an important issue that needs to be addressed. "
The report found no effect on puberty in males, while it is not possible to say that high levels of chemistry have caused early puberty for males.
"The age of puberty has been progressing over the years," said Ali Abara, a doctor and senior lecturer in endocrinology at Imperial College in London who did not participate in the research. A major theory of early puberty was an increase in the number of overweight and obese children "He added," We generally have to reduce unnecessary exposure to chemicals, if it can be avoided, to avoid any potential damage, but in practice it may be difficult to do so because they are everywhere. "