Science and Technology
publicado em 13/09/2011 às 03h00:00
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Men experience biological changes to dedicate themselves to caring for children

Testosterone levels fall abruptly after parenthood, and sexuality-related activities do not disturb the responsibilities of the father

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A new study from Northwestern University provides compelling evidence that human males are biologically wired to care for their offspring, showing for the first time, conclusively that the paternity reduces testosterone levels of a man.

The effect is consistent with what is observed in many other species in which males help to care for dependent children. Testosterone increases the behaviors and other characteristics that help a man compete for a mate. Once they succeed and become parents, the activities related to the "mating" may conflict with the responsibilities of parenthood, it is advantageous to reduce the body's hormone production.

"We humans are unusual among mammals in that our children are dependent on older individuals for food and protection for more than a decade. Raising children is a cooperative effort that is of necessity among humans, and Our study shows that in this case the parents are biologically wired to help with the work, "said anthropology professor Christopher W. Kuzawa.

The study followed a large group of men who were not parents and noted if your hormones change after becoming parents.

According to Lee Gettler, contrary to what has already questioned one day, are not men with low testosterone are more likely to become parents, but "Instead, the men who started with high testosterone were more likely to become parents, but when they became the testosterone level dropped substantially. Our results suggest that this is especially true for parents to become more involved in child care. "

The new study's findings also suggest that parents may suffer a decline especially large but temporary in testosterone levels when they bring home a newborn baby. "Fatherhood and the demands that come with a newborn baby requires many adjustments emotional, psychological and physical. Our study indicates that the biology of one man can change substantially to help meet these demands," Gettler said.

The authors also suggest that their findings may provide the disclosure of a reason why single men tend to have worse health than married men and fathers. "If parents have lower levels of testosterone, this may protect against certain chronic diseases as they age," said Kuzawa.

The study followed a group of 624 men aged 26 years by 21.5 and 4.5 years in the Philippines.

   Palavras-chave:   Testosterone    Fatherhood    Children    Mammals    Emotional adjustment    Physical adjustments   
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