Sperm counts and concentration are down all over the world, according to a new study that updates previous research and raises questions about exposures and men's health.From 1973 to 2000, sperm counts dropped by 1.2% per year, "which is a lot," said Hagai Levine, who helped lead the research. From 2000 to 2018, the decline was 2.6% per year, "which is an amazing pace." The United States is part of this larger trend. "In the U.S., due to availability of good data, we have the highest certainty that there is a strong and sustainable decline, but it's similar globally," Levine said. It's unclear why sperm counts have been falling. "We don't understand why we're seeing this pattern, so I think it's hard to be alarmist for an individual," said Dr. Michael Eisenberg, a urologist focused on male fertility and sexual function at Stanford University and Stanford Health Care in California. He was not involved in the new study....
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