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Complexity Digest 2011.18 - 06
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2011/09/16

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Longitudinal evidence that fatherhood decreases testosterone in human males,
PNAS
 









Excerpt: In species in which males care for young, testosterone (T) is often
high during mating periods but then declines to allow for caregiving of
resulting offspring. This model may apply to human males, but past human studies
of T and fatherhood have been cross-sectional, making it unclear whether
fatherhood suppresses T or if men with lower T are more likely to become
fathers. Here, we use a large representative study in the Philippines (n = 624)
to show that among single nonfathers at baseline (2005) (21.5 ± 0.3 y), men
with high waking T were more likely to become partnered fathers by the time of
follow-up 4.5 y later (P < 0.05). Men who became partnered fathers then
experienced large declines in waking (median: âˆ'26%) and evening (median:
âˆ'34%) T, which were significantly greater than declines in single nonfathers
(P < 0.001). (…)
Source: Longitudinal evidence that fatherhood decreases testosterone in human
males[ http://dx.doi.org/10.1073/pnas.1105403108 ], Lee T. Gettler, Thomas W.
McDade, Alan B. Feranil, Christopher W. Kuzawa, DOI: 10.1073/pnas.1105403108,
PNAS, Published online before print, 2011/09/12

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