However, Dr Allan Pacey, fertility expert at the University of Sheffield and secretary of the British Fertility Society, has pointed out that soy is widely eaten in Asia, where there is little evidence of a decline in fertility.
French research earlier this year revealed that men also have a 'biological clock' and a successful pregnancy is less likely when a man is over 35.
Latest research also points to the fact that if a man is in his late 30s, the chance of his partner miscarrying is higher and for couples in the study where the man was over 40, one third of pregnancies ended in miscarriage.
July 2008
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