Eating even moderate amounts of soy can cut a man's sperm concentration in half because foods like tofu and soy milk contain estrogen.
A regular diet of even modest amounts of food containing soy may halve sperm concentrations, suggest scientists.
The study, published in the journal Human Reproduction, found 41 million fewer sperm per millilitre of semen after just one portion every two days.
The authors said plant oestrogens in foods such as tofu, soy mince or milk may interfere with hormonal signals. Read more
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