Sperm quality has been declining for 16 years among men in the US

Vials of donor sperm frozen by liquid nitrogen

Ted Soqui/Corbis via Getty Images

A 16-year study of US sperm donors shows that sperm quality has been steadily declining, possibly due to increased chemical exposure and lifestyle changes.

Chelsea Canon at Reproductive Medicine Associates of New York, a fertility clinic, and her colleagues looked at more than 170,000 semen analyses conducted between 2005 and 2021 for healthy 19 to 38-year-olds from nine geographic regions across the US. The researchers say the data comes from a “diverse set” of men, although it is unclear how representative it …

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