http://news.bbc.co.u...lth/7519459.stm
The article discusses a submission to the journal Human Reproduction that mentions that soy products can potentially halve the amount of sperm at a guy's disposal.
"Oestrogenic compounds in food or the environment have been of concern for a number of years, but we have mostly thought that it was boys exposed in the uterus before birth who were most at risk.
"We will have to look at adult diet more closely, although the fact that such large parts of the world have soy food as a major part of their diet and don't appear to suffer any greater infertility rates than those on western diets suggests that any effect is quite small."
- Dr Allan Pacey, a senior lecturer in andrology from the University of Sheffield
