Also, the type of soy you’re eating matters. The traditional soy products consumed in Asia are clean, unprocessed, and often fermented, which most of our soy is not. In the Western world, most soy products are made of genetically modified soybeans rife with pesticides and preservatives. Worse yet, processed soybean oil, soy lecithin, and isolated soy protein lace everything from packaged foods and breakfast cereals to lattes and infant formulas—and have nothing to do with good health.