Men aren’t producing as many sperm as they were decades ago, and the pace of decline is accelerating, researchers say. But experts also say that more research is needed.
Evan Bush
“There is a decline in reproductive function,” said Swan, a professor of environmental medicine and public health at the Icahn School of Medicine at Mount Sinai in New York City. “This is not an isolated phenomenon.” The researchers behind the study first made waves in 2017, when they published a paper that showed falling sperm counts in North America, Europe and Australia — places where data was readily available.
To assess sperm counts worldwide, researchers evaluated hundreds of scientific articles, ultimately combining the data and findings of 223 previous articles about sperm concentration. The researchers evaluated the estimates, which included data on semen samples from 1973 to 2018. The authors tried to control for factors like age and abstinence time.
“I don’t think there’s any doubt these chemicals affect semen quality. Where there is doubt is how you parse out how much change is due to lifestyle factors and how much is due to chemicals,” Swan said. It’s possible that medical and scientific journals are more likely to publish results that show declines, said Dr. John Amory, a professor of medicine at the University of Washington who wasn’t involved in the analysis. It’s also possible that the type of men involved in sperm count studies is different from those who weren’t.
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