A comprehensive analysis suggests a significant decline in male testosterone levels, which have decreased by more than 50 percent over the past five decades. These findings were presented at the Congress of the European Society for Human Reproduction and Embryology (ESHRE) in London, stemming from a large-scale review of existing medical literature. The study synthesized data drawn from over 8,650 previous investigations conducted between 1972 and 2019.
The research incorporated patient samples from 102,334 individuals across five nations, including Israel, the Netherlands, Brazil, Finland, and Denmark. The investigation was led by Hagai Levine of the Hadassah Hebrew University Medical School in Jerusalem. In addition to tracking hormonal changes, the researchers examined trends in male health outcomes.
The analysis revealed a notable escalation in prostate cancer diagnoses, with incidence rates having increased by 54% since 1979. Furthermore, the data indicated a sustained upward trajectory in overall cancer rates beginning in the year 2000, reportedly increasing by one percent annually, a rate that the scientific community has flagged for further scrutiny. These findings provide a broad epidemiological overview connecting long-term hormonal shifts with evolving patterns of cancer incidence in men.
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