There was been suggestions that soy consumption in men can reduce testosterone and increase estrogen levels. There has even been some research done in this area

There was been suggestions that soy consumption in men can reduce testosterone and increase estrogen levels. There has even been some research done in this area [1, 2, 3, 4, 5]. [1] http://cebp.aacrjournals.org/content/16/4/829.abstract http://cebp.aacrjournals.org/content/16/4/829.abstract [2] http://www.ncbi.nlm.nih.gov/pubmed/10798211 http://www.ncbi.nlm.nih.gov/pubmed/10798211 [3] http://www.ncbi.nlm.nih.gov/pubmed/11103227 http://www.ncbi.nlm.nih.gov/pubmed/11103227 [4] http://www.ncbi.nlm.nih.gov/pubmed/19524224 http://www.ncbi.nlm.nih.gov/pubmed/19524224 [5] http://www.ncbi.nlm.nih.gov/pubmed/17908338 http://www.ncbi.nlm.nih.gov/pubmed/17908338