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The body
Sperm counts have halved in fifty years
185 studies, 40,000 men, and a line that keeps going down.
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Nephron
· CC BY-SA 3.0 · Wikimedia Commons
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fall since 1973
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A meta-analysis pooling 185 studies found that sperm concentration in men from North America, Europe and Australia fell by 52.4 per cent between 1973 and 2011. An updated analysis in 2022 extended the finding to South America, Asia and Africa, and reported that the rate of decline appears to have accelerated since 2000.
No single cause has been established. The candidates under investigation are the ones you would expect — endocrine-disrupting chemicals, obesity, smoking, heat, sedentary work — and the honest position is that the trend is far better documented than its explanation.
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The decline was not found in men from other regions in the original study, which was initially read as reassuring. The 2022 follow-up found the same fall there too; the earlier absence was a shortage of data, not of decline.
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