Soya bad for sperm

Eating soya-based food may lower sperm count and play a role in male infertility, especially in obese men, according to Harvard researchers. Intake of 15 soya-based foods in the previous three months was assessed for 99 male partners of subfertile couples who presented for semen analysis. The study found that was an inverse association between soya intake and sperm concentration that remained significant after accounting for age, abstinence time, body mass index, caffeine and alcohol intake and smoking. Men with the highest category of soya intake had 41 million sperm/ml less than men who did not consume soy foods. The researchers speculate that soy increases oestrogen activity, which may have a negative affect on sperm production and interfere with other hormonal signals. (Soy food and isoflavone intake in relation to semen quality parameters among men from an infertility clinic. Hum Reprod. 2008 Jul 23. [Epub ahead of print]).

 

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