Soy sinks his sperm count, a study in the journal Human Reproduction reports.
Of men at a fertility clinic who reported their intake of soy products, those who ate the most (about equal to one tofu burger every two days) had 41 million fewer swimmers per milliliter of semen than those who ate zip.
Soy has high levels of plant estrogens, which animal studies show may affect sperm production and overall fertility
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http://www.womenshealthmag.com/nutrition/fertility