A rigorous and comprehensive meta-analysis of data collected between 1973 and 2011 finds that among men from Western countries, sperm concentration declined by more than 50 percent, with no evidence of a ‘leveling off’ in recent years.
In the first systematic review and meta-analysis of trends in sperm count, researchers from the Hebrew University-Hadassah Braun School of Public Health and Community Medicine and the Icahn School of Medicine at Mount Sinai report a significant decline in sperm concentration and total sperm count among men from Western countries. The study was published in Human Reproduction Update, a leading journal in the fields of Reproductive Biology and Obstetrics & Gynecology.
The researchers found … a 59.3 percent decline in total sperm count, among men from North America, Europe, Australia and New Zealand who were not selected based on their fertility status. These findings strongly suggest a significant decline in male reproductive health that has serious implications beyond fertility and reproduction, given recent evidence linking poor semen quality with higher risk of hospitalization and death.
By screening 7,500 studies and conducting a meta-regression analysis on 185 studies between 1973 and 2011, the researchers found a 52.4 percent decline in sperm concentration, and a 59.3 percent decline in total sperm count, among men from North America, Europe, Australia and New Zealand who were not selected based on their fertility status. In contrast, no significant decline was seen in South America, Asia and Africa, where far fewer studies have been conducted.
The study also indicates the rate of decline among Western men is not decreasing: the slope was steep and significant even when analysis was restricted to studies with sample collection between 1996 and 2011.
The research was led by Dr. Hagai Levine, Head of the Environmental Health Track at the Hebrew University-Hadassah Braun School of Public Health and Community Medicine, Jerusalem, with Dr. Shanna H Swan, Professor in the Department of Environmental Medicine and Public Health at the Icahn School of Medicine at Mount Sinai, New York, and an international team of researchers from Brazil, Denmark, Israel, Spain and the United States.
While declines in sperm count have been reported since 1992, the question has remained controversial because of limitations in past studies. However, the current study uses a broader scope and rigorous meta-regression methods, conservatively addresses the reliability of study estimates, and controls for factors that might help explain the decline such as age, abstinence time, and selection of the study population.
The causes of the decline have been widely linked to chemical exposure, especially from agricultural chemicals like atrazine that are “chemical castrators” of men. These chemicals cause “feminization” of males, leading to hormonal disruption and sperm population decline. That decline, researchers found, is accelerating in western nations like the United States and could lead to a collapse in human population.
Chemical exposure causing “feminization” of biological males while destroying sperm production and viability
Although this was not the focus of this particular study, the same chemicals causing this plunge in sperm production may also be increasing non-male gender expression in biological males, leading an increasing number of biological males to pursue transgender lifestyles or surgeries. This biological fact remains adamantly denied by the anti-science political (((Left))) in America, which pursues the “magical science” narrative that transgenderism is solely a “choice” and cannot be influenced by chemical exposure. Yet every biological scientist and chemist in the world knows that chemical exposure alters biological function in humans. In fact, the very process of medical gender transition from a biological male to a female involves chemical castration using hormone-disrupting prescription chemicals such as Cyproterone.
The common food packaging chemical BPA is also widely known to be a hormone disruptor and estrogen mimicker. Those who insist that choice alone can override the laws of chemistry and genetics are living a delusion (Bill Nye, anyone?). Biological sex expression is determined by genes and chemistry (including chemical exposure), not by wishes and hopes.
Environmental exposure to such chemicals is irrefutably a significant vector for sperm decline among men in western nations. As explained by the researchers:
While the current study did not examine causes of the observed declines, sperm count has previously been plausibly associated with environmental and lifestyle influences, including prenatal chemical exposure, adult pesticide exposure, smoking, stress and obesity.