It was actually (purportedly) a 59% decrease from 1973 to 2011. It's, again purportedly, due to endocrine-disrupting chemicals, particularly phthalates.
Phthalates are used to soften and increase the flexibility of plastics. It's used in much of the tubing that processed foods pass through and this is often believed to be the issue. The claim is that endocrine-disrupting chemicals trick the body into thinking it has more testosterone than it does and it therefore stops producing it adequately.
That said, others have suggested that it's entirely possible that the earlier counts were simply less accurate due to inferior technology.
Mens sperm count dropping
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It was actually (purportedly) a 59% decrease from 1973 to 2011. It's, again purportedly, due to endocrine-disrupting chemicals, particularly phthalates.
Phthalates are used to soften and increase the flexibility of plastics. It's used in much of the tubing that processed foods pass through and this is often believed to be the issue. The claim is that endocrine-disrupting chemicals trick the body into thinking it has more testosterone than it does and it therefore stops producing it adequately.
That said, others have suggested that it's entirely possible that the earlier counts were simply less accurate due to inferior technology.