Friday, August 18, 2017
The New York Times (Aug. 16, 2017): Sperm Count in Western Men Has Dropped Over 50 Percent Since 1973, Paper Finds, by Maya Salam
The sperm count of men in Western countries has been declining precipitously with no signs of “leveling off,” according to new research, bolstering a school of thought that male health in the modern world is at risk, possibly threatening fertility.
By examining thousands of studies and conducting a meta-analysis of 185 — the most comprehensive effort to date — an international team of researchers ultimately looked at semen samples from 42,935 men from 50 countries from 1973 to 2011.
They found that sperm concentration — the number of sperm per milliliter of semen — had declined each year, amounting to a 52.4 percent total decline, in men from North America, Europe, Australia and New Zealand.
Possible causes that researchers have identified include exposure to cigarette smoke, alcohol, and chemicals--such as phthalates--in utero. Age, obesity, and stress also play a role in lowered sperm count and quality. While long-term consequences have yet to be identified, research shows that fertility rates in Western nations are too low to sustain the current population.