A study that was published in 2008 in the journal Human Reproduction, suggests that a diet of even modest amounts of soy based food or even just food containing soy may halve sperm concentrations.
One of the researchers behind this study is Jorge Chavarro at the Harvard School of Public Health in Boston, Massachusetts. In his study he and his colleagues sampled 100 couples who were seeking treatment for infertility.They had the men provide semen samples and then answer survey questions that pertained to the amount of soy products (including food such as "powerbars"Â and tofu) that they had consumed over the
