Sons born to women who ate a lot of beef during their pregnancy have a 25 percent below-normal sperm count and three times the normal risk of fertility problems, researchers reported Tuesday.
The problem may be due to anabolic steroids used in the United States to fatten the cattle, Shanna Swan of the University of Rochester Medical Center reported in the journal Human Reproduction. It could also be due to pesticides and other environmental contaminants, she said.
If the sperm deficit is related to the hormones in beef, Swan's findings may be "just the tip of the iceberg," wrote biologist Frederick vom Saal of the University of Missouri in an editorial accompanying the paper.
In daughters of the beef-eaters, those same hormones could alter the incidence of polycystic ovarian syndrome, the age of puberty and the postnatal growth rate, he said.
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/03/28/MNG8LOT1SF1.DTL