Mark Messina (the study's author) is a shill for the soy industry.
"M.M. regularly consults for companies that manufacture and/or sell soyfoods and/or isoflavone supplements, and he is the executive director of the Soy Nutrition Institute[0], a science-based organization that is funded in part by the soy industry and the United Soybean Board."[1]
More people would trust science if more scientists were not whores.