Scientists from Inner Beira University (Portugal) have found that exposure to high levels of bisphenol A can affect male fertility. Research published International Journal of Molecular Sciences.
Scientists reviewed existing research on the effects of bisphenol A on the human reproductive system. Data show that this substance harms sperm, impairs their reproduction, reduces sperm quality and can lead to infertility.
In a Danish population study, exposure to BPA was associated with an increase in testosterone levels. Other studies in rural China have shown that environmental BPA levels are associated with lower total testosterone levels in overweight men. These findings may suggest a role for body weight and smoking status in BPA-induced hormonal changes.
Studies on men diagnosed with infertility have found an association between high urinary BPA levels and low sperm count, concentration, viability and sperm motility. Conversely, some studies comparing fertile men with infertile men have shown no association between exposure to small amounts of BPA and infertility.
The authors noted that additional studies are needed to resolve the contradictions and reach a final conclusion, as the published studies are observational in nature and can therefore only determine the existence of a relationship and not a causal relationship.
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