September 13, 2011

Fatherhood Decreases Testosterone

Elizabeth Norton, Science Now


AP Photo

Humans are probably the only species on Earth who nurture their young for 20 years or more. For men in particular, the intensive demands of parenting can come as such a shock that a built-in biological mechanism has evolved to help cope with the change. A new study shows that becoming a father leads to a sharp decline in testosterone, suggesting that although high levels of the hormone may help men win a mate, testosterone-fueled traits such as aggression and competition are less useful when it comes to raising children.

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TAGGED: Testosterone, Fathers