A new study published in URO Today examined the effects of isoflavone intake from soy foods in males of sub-fertile couples. The study assessed the mens' semen and their intake of 15 soy-based foods in the last three months. Isoflavones are plant-derived compounds that are known to promote estrogenic activity. High isoflavone intake has been reported to be associated with decreased animal fertility but the impact of high isoflavone intake on human fertility was unknown until now.
The researchers found there was an inverse association between soy food intake and sperm concentration that remained significant when evaluated with respect to age, abstinence, body mass and caffeine and tobacco use. Interestingly, while sperm concentration was down, there did not appear to be any effect on sperm motility. Additionally, the study found that while sperm concentrations were lower in the men that consumed the most soy products, semen volume was increased.
The researchers conclude that fertility issues may manifest themselves in populations whose diet is rich in isoflavones.
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Source: URO Today
