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High Intake of Soya Could Reduce Male Fertility
October 19, 2007 at 1:01 PM
Menīs Health News
Dr. Jorge Chavarro of the Harvard School of Public Health in Boston, Massachusetts, US, has revealed that soya foods contain high amounts of isoflavones, compounds that mimic the effects of oestrogen in the body. He says that such oestrogen-like compounds can have a dramatic impact on the male body.
The researcher also referred to previous studies in mice that suggested that high intake of soya products could reduce male fertility.
In the present study, Dr. Chavarro and his colleagues identified 100 couples seeking treatment for infertility. They collected semen samples from the men, and asked them to complete a questionnaire about their intake of 15 soya-based foods such as miso soup, "power bars", and tofu over the preceding three months.
The analysis of the data thus collected showed that men who consumed half a serving of soya-based food each day had 65 million sperm per millilitre on average, 40 per cent less than the typical sperm count of men who do not eat such foods, which normally ranges between 80 million to 120 million sperm per millilitre.
Dr. Chavarro revealed that men with counts lower than 20 million sperm per millilitre were generally considered infertile. While presenting the new findings at the annual meeting of the American Society for Reproductive Medicine, he speculated that isoflavones from soya products might lower sperm count by interfering with other hormonal signals that drive sperm production in the testes.
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