Andrew Huberman· PhD
Testosterone levels are declining (by generation).
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The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
Testosterone levels are declining (by generation).
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I think there is pretty convincing evidence that that is happening and I think the reason for that again is probably not certain but you know there have been you know some pretty nicely designed cohort studies where theyve recruited you know men in the the 2000s the 90s the 80s and you can see that depending on when these men are recruited just you know matching age for age these testosterone levels tend to be lower um and then en haanes which is again this sort of longitudinal study run by the CDC um that has also sh looking at testosterone levels over you know decades the testosterone levels have declined over time
I think there is pretty convincing evidence that that is happening
you know there have been you know some pretty nicely designed cohort studies where theyve recruited you know men in the the 2000s the 90s the 80s and you can see that depending on when these men are recruited just you know matching age for age these testosterone levels tend to be lower
But now I think we got to start looking earlier.
testosterone is dropping 1% every year.
they've done studies with paleontologists with bone structures and I talked about this in my book of course because they can determine that that testosterone has actually been dropping for thousands of years just because people started ingesting all these plants right oh and they you know they there's like a more feminized facial bone structure in men even like I say thousands of years ago but it's just become dramatically dramatically changed in the last 20 years because of all the plastics and all these you know these chemicals
just like they redefine that age or the the range for testosterone because it's gotten so low they can see if you go in there with super low testosterone they consider that normal now they won't even flag it
either well starting in the 1970s this data that shows very clearly that testosterone started to decline um at a rate like one percent a year um and that's adjusted for the the increase in obesity so the real rate is probably like one and a half percent
it mirrors the uh declining sperm counts which the data the data for sperm counts actually goes back to the 30s and they can see a decline you know roughly the same like one to two percent a year all the way from the 30s until present day
and with testosterone as well it's less well established but there's a clear trend and it goes up like the last study was published last year so in this decline so it's continuing and what's what's almost scarier is the these studies is just like a straight linear decline and there's no sign of it leveling off
there's a lot of research to show that just 30 years ago we had double the testosterone what was it 50 years ago 100 years ago 10 000 years ago right i could only imagine how high that testosterone was
our testosterone is declining as men our father's generation Our grandfather's generation had much higher testosterone than we do today
In the last 50 years, men's testosterone has dropped 30 to 40%.
even when controlling for BMI/waist-to-hip ratio, there seems to be a population-level decline in average testosterone levels.