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Fatherhood Lowers Testosterone in Men


Fatherhood Lowers Testosterone in Men

Fatherhood lowers testosterone levels making it easier for men to be involved in raising children.

High levels of the hormone can rev up a man's sex drive, increase risk-taking behaviors and raise the need for social dominance. Those factors can help win a mate but are poor traits when it comes to raising a baby, which requires cooperation from both parents.

"Our study shows that human fathers are biologically wired to help with the job," said Christopher Kuzawa of Northwestern University, who worked on the study published in the Proceedings of the National Academy of Sciences.

Prior studies have shown fathers tend to have lower testosterone than men who have no children but it was not clear whether fatherhood was the cause or that men with lower testosterone were more likely to become fathers.

The Northwestern study tried to answer that question by following a group of more than 600 men from the Philippines over five years. The men were not fathers at the start of the study.

The team saw clearly that right after the men became fathers, their testosterone levels dropped, at least for a short time.

"It's not the case that men with lower testosterone are simply more likely to become fathers," Lee Gettler of  University, who worked on the study, said in a statement.

"On the contrary, the men who started with high testosterone were more likely to become fathers, but once they did, their testosterone went down substantially."

Gettler said the findings suggest fathers may experience an especially large but temporary drop in testosterone when they first bring home a newborn baby.

"Fatherhood and the demands of having a newborn baby require many emotional, psychological and physical adjustments," Gettler said. "Our study indicates that a man's biology can change substantially to help meet those demands."

Dr. Allan Pacey of the University of Sheffield said testosterone levels in men generally do not change much.

"They can slowly decline as men get older and change in response to some medical conditions and treatment. But to see dramatic changes in response to family life is intriguing." he said in a statement.

Professor , a professor of endocrinology at the University of Oxford, said endocrinologists tend not to pay much attention to men's testosterone levels, as long as they are in the normal range.

"Life and biology may be much more subtle and adaptable than we had previously thought," he said.


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Prepared by: Scientific Section


Source :

Reuters Health






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