Plastics ingredient phthalates linked to smaller penises
The study, published in the current issue of the journal Environmental Research, also found the chemical appears to make the overall genital tracts of boys slightly more feminine.
The findings are sure to add more controversy to phthalates, a chemical that is added to polyvinyl chloride plastic to make it less brittle, and to many types of personal care products including fragrances, hair sprays and nail polish.
The research was conducted on children from three different areas of the United States, and it found a strong statistical correlation between expectant mothers who had above-average levels of the chemical in their urine while pregnant and the feminizing effect on their sons.
Phthalates are "probably reproductive toxins and should be eliminated from products gradually because we don't need them," said Shanna Swan, director of the Center for Reproductive Epidemiology at the University of Rochester's school of medicine in New York state. She led the team of scientists who examined the boys.
Scientists have been investigating the possible effects on boys of phthalates because rodent studies have shown the chemical has the peculiar ability to shorten the space between the anus and the genitalia in male mice exposed during fetal development.
This space, known as anogenital distance or AGD, is normally about twice as long in young male mice than in females. For mice, AGD is considered a measure of masculinity and a way to determine the sex of the pups. Scientists are so confident of the effect that they've given the impact of the chemical on male rodents a name—phthalate syndrome.
Surveys of children have also found that there is a marked sexual difference for this trait in humans, too, with the length in boys about 50 percent more than in girls.
Swan's research, conducted on 106 boys from Los Angeles,Ohio, Missouri and Minnesota, is among the first to raise the possibility that phthalate syndrome may also be at work in humans, because it found pregnant women with the highest amount of phthalates were markedly more likely to give birth to boys who had shorter anogenital distances.
When the boys were compared, none of the 29 with a shorter AGD were born to women who had low amounts of phthalates, while among the boys with a long space, only one was born to a mother with a high amount of the chemical.
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