New Dad's Testosterone Levels Dive Study Says
Seriously, So What?
Entering into fatherhood, new dad's testosterone levels fall sharply, according to a new study. By that, new dad is likely to be a bit calmer, more caring and less interested in sex - all to secure his interested in his offspring according to the researchers.
And now the debate is running wild. Some make fun of the dads, others defend them. "Dads are only half men", "Never have children", "Plans to restore dad's testoterone levels" are just some of the views and jokes on the topic.
OK, so some researchers finally got the idea to check not only moms' hormone levels, but those of New Dad. And surprise - dad is affected too.
Seriously - so what?
It has been know for ages that mom is affected in many ways by both the pregnancy and the breastfeeding hormones. (You can read about the breastfeeding hormones here.)
Some of the effects on mom are that she becomes calmer, more caring and less in the mood for making love. Anyone calling Mom less of a woman? Wouldn't think so!
Why then is it so traumatic to find out that new dad is affected in a similar way? Lower testosterone levels mean that dad becomes calmer, more caring and less in mood for making love...
Does anyone more than me see a pattern here?
Let's take a deeper look at what this study found and what it might mean for the new parents.
What The Testosterone Study Found
This first-ever large and long-term study of hormonal changes related to fatherhood showed that men who take care of their children have lower testosterone levels. According to the researchers, this appears to be Mother Nature's way of making the dads less aggressive and more caring.
The 5-year study, published on September 13, 2011 by PNAS, found that a new dad's testosterone levels fall sharply (34%) when bringing home the baby. The effect is dramatic, quick and long-term. Five years later, the dads still had lower testosterone levels. Another, smaller study found that a man's testosterone level fell within minutes after starting to interact with his child. No other life event has been found to change male testosterone levels this dramatically.
And it is not the case that men with lower testosterone levels are more likely to become fathers, a theory put forth earlier. On the contrary, actually. Men with higher testosterone levels are more likely to have children in the first place, according to another recent study.
Testosterone Falls To Protect The Baby
Testosterone affects a man's muscle size and strength, bone growth and strength, sex drive (libido) and sperm production mention some. It also keeps belly fat off the male body, helps keeping spirits up and increases aggressiveness.
The researchers think that the falling testosterone levels are Mother Nature's way of protecting the offspring from male aggressiveness and also facilitating a caring mindset for the dad. This phenomenon is seen in mammals in general, and has now also been documented among humans.
So new dad, who used to be a well-built, energetic hunk with a high sex drive, transforms into someone weak, fat, asexual, moody and wimpy when bringing home his baby?
Sounds pretty similar to the transformation new moms go through...
New Dads Gain Weight
One study from 2004 confirms that each new baby increases a man's risk of obesity by 4 percent. (For women, the risk increases by 7 percent.)
The researchers concluded that eating and exercising behavior changes are behind these risks, but maybe it is actually partially a hormonal effect? The new study did confirm that the testosterone levels remained low for a long time, so I find it reasonable to believe that they may be involved in the weight gain too.
Some other recent research indicates that male hormone levels may very well change already during pregnancy, with weight increase as one of the side effects (an effect known as couvade syndrome or sympathy pregnancy, which you can read more about here.)
The Libido Becomes Lower Too
Most new parents can confess that while having a baby is the best that ever happened to them, there are definitely side effects that are not that great. Sex life suffers, no doubt.
A study by psychologist John Gottman published in 2000 in the Journal of Family Psychology found that as many as two-thirds of couples experience a significant decline in marriage satisfaction, including less-frequent or less-satisfying sex, more conflict and more emotional distance, after the first baby arrives.
For new mom, breastfeeding sky rocket prolactin levels, which in turn suppress both fertility and libido. The reduced levels of testosterone obviously may have a similar effect on men. No wonder sex life is virtually nonexistent among many new parents.
(Sex life during breastfeeding is discussed and debated in this article.)
New Dads Are At Risk For Postpartum Depression
New dads, just like new moms, are at risk for postpartum depression. A study published in 2010 showed that 1 out of 10 new dads develop postnatal depression. The researcher did not mention testosterone levels as a possible cause, but this new testosterone study hadn't been published then.
Among new moms, as many as 1 of 5 develop postnatal depression.
Life As New Parents Is Hard And We Are Not Just Spoilt
Any new parent will be able to tell you that being a new mom or dad is hard. Usually sleep-deprivation, breastfeeding, no you-time and inability to adjust to having no control over ones' time are often mentioned explanations to why new parents seem to have less fun, less energy, have no sex, care less about their looks and overall have quite a sad life.
This does seem just a little bit spoilt, doesn't it? A clash between the modern human's perceived right to do whatever she wants with her life and the hard work of constant diapering, feeding and soothing of a new baby. Who had time to whine over no you-time and no sleep when we all had to work around the clock to find food back in earlier times?
Well, obviously that is not the whole story. Nature seems to doing its best to make sure parents take care of their offspring by making both parents less outgoing, less interested in making new babies, making it easier for them build on weight (hence protecting them from starvation) and making them calmer.
The side effects - a far from exciting sex life, a chubbier body and a mellow mood are far from the perceived ideal of any man, woman or relationship today.
But maybe it is all natural?
Maybe new parents are simply meant to be a bit chubby, calm, caring and asexual. And if that's the case, then why not just be cool about it; even appreciate this era in life for what it is: More love and love handles and less lovemaking.
Maybe not so bad after all..?
Some Articles Debating The Study
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Interested in learning more about new dads' testoterone levels? Here are the references and links to the studies mentioned in the article.
You'll also find many more dad related articles in the list in the right column.
- Lee T. Gettler, Thomas W. McDade, Alan B. Feranilc, Christopher W. Kuzawa (2011), Longitudinal evidence that fatherhood decreases testosterone in human males, PNAS September 12, 2011
- Fathers Wired to Provide Offspring Care:Study confirms that testosterone drops steeply after baby arrives
- Gettler LT, Agustin SS, McDade TW, Kuzawa CW. Short-term changes in fathers' hormones during father-child play: Impacts of paternal attitudes and experience. Horm Behav.
- New dads get baby blues too
- New dads gain weight too
- Shapiro, A.F., Gottman, J.M., and Carrere, S., (2000). The Baby and the Marriage: Identifying factors that buffer against decline in marital satisfaction after the first baby arrives, Journal of Family Psychology, 14(1), 59-70
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