The authors found that men whose mothers ate more than 7 beef meals per week during their pregnancies had sperm concentrations 24.3% lower and a risk of fertility problems three times the normal rate.
Could it be because that the cattle in the US and Canada is still being pumped up with sex hormones? The FDA still allows the use of these hormones while it has been completely banned in Europe since 1988.
http://humrep.oxfordjournals.org/cgi/content/full/22/6/1497
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