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Hard bottles, but not the men

Hard plastic bottles are said to contain bisphenol A

MALE factory workers in China who got very high doses of a chemical that’s been widely used in hard plastic bottles had high rates of sexual problems, researchers reported Wednesday.

Heavy exposure to BPA, or bisphenol A, on the job was linked to impotence and lower sexual desire and satisfaction, according to the study, which adds to concerns about BPA’s effects on most consumers.

The men in the study experienced BPA levels about 50 times higher than those faced by typical American men, said researcher Dr De-Kun Li. “We don’t know” whether more typical doses have similar effects, he said.

People shouldn’t be alarmed by the finding, said Li, a reproductive and perinatal epidemiologist at Kaiser Permanente’s research division in Oakland, California. But he said it would be prudent to limit exposure to BPA while scientists look for any effects from lower doses.

Li is lead author of the latest study, published online Wednesday by the journal Human Reproduction. The work was financed by the National Institute of Occupational Safety and Health.

BPA is used in a wide variety of consumer products, including some hard plastic bottles and metal food or beverage cans.

For the new research, Li and colleagues studied 164 factory workers in China who were exposed to high levels of BPA on the job.

They were compared to 386 other men in the same town who either worked at other factories or were married to factory workers.

The scientists measured BPA exposure through air sampling, and interviewed the workers about their sexual functioning.

Compared to the other workers, men with high BPA exposure were about four times as likely to report trouble achieving erections, about seven times as likely to say they had difficulty ejaculating, and about four times as likely to report low sex drive or low satisfaction with their sex lives.

The effects are dramatic and “pretty clearly related to the exposure,” said Linda Birnbaum, director of the National Institute of Environmental Health Sciences, who was not involved in the research.

The finding fits in with animal studies and should be followed up by research in the general population, she said. Her institute said last month it will spend more money on BPA-related research, bringing the total to US$30 million over two years. – AP