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Are falling sperm counts really an ‘existential threat’ for humanity? Rachel E. Gross
The decline has been called a ‘canary in the coal mine’ - Getty Images/iStockphoto
Male scientists have long waxed poetic on the contents of their testes. “Sperm is a drop of brain,” wrote the ancient Greek writer Diogenes Laertius. Leonardo da Vinci drew the penis with a sperm duct that connected directly to the spinal cord. The 17th-century microscopist Antonie van Leeuwenhoek claimed that each sperm cell contained within it a folded-up human being waiting patiently to unfurl.
For nearly as long, scientists have fretted about sperm’s seemingly inevitable decline. Most recently, a series of alarming headlines – as well as a new book by an public health researcher at Mount Sinai Medical Centre in New York – warned that falling sperm counts might threaten the future of the human race. “It’s a global existential crisis,” says Shanna H Swan, author of the bo
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Jun 04, 2021 10:10 PM ET
Now a group of interdisciplinary researchers from Harvard and the Massachusetts Institute of Technology contend that fears of an impending Spermageddon have been vastly overstated. In a study published in May in the journal Human Fertility, they re-evaluated the 2017 review and found that it relied on flawed assumptions and failed to consider alternate explanations for the apparent decline of sperm.
In an interview, Sarah Richardson, a Harvard scholar on gender and science and the senior author on the new study, called the conclusion of the 2017 review “an astonishing and terrifying claim that, were it to be true, would justify the apocalyptic tenor of some of the writing.” Fortunately, she and her co-authors argue, there is little evidence that this is the case.
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