Headlines claiming “soy products lower sperm count” do not tell the whole story. The small scale, preliminary study that Dr. Jorge Chavarro, published online in Human Reproduction, is based on recollected intake of soyfoods and not on specific diets containing soyfoods.
Obesity may be the explanation for the negative findings of this study. Dr. Chavarro found high soyfood intakes are associated with lower sperm concentration but “the association was more pronounced among overweight and obese men than among lean men.” Men with high levels of body fat are likely to produce more estrogen than their slimmer counterparts.
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