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Testosterone Replacement, Low T, HCG, & Beyond
Testosterone and Men's Health Articles
Decline in Serum Testosterone Levels Among Adolescent and Young Adult Men in the USA
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<blockquote data-quote="doyouwantbirds" data-source="post: 237938" data-attributes="member: 44567"><p>So I've been looking into this for a while and got dissatisfied with the research. I had some questions - how long has it actually been falling and do levels differ around the world? (this could tell us what is causing the drop) I found an incredible lack of published research into those questions, so I aggregated the results of about 1000 individual unrelated studies to answer my questions. Here's my site for more detailed info: <a href="https://testosteronedecline.com/testosterone-levels-100-years-ago/" target="_blank">Testosterone Levels 100 Years Ago - TestosteroneDecline.com</a></p><p></p><p>Here's what I found:</p><ul> <li data-xf-list-type="ul">It's hard to tell, but testosterone appears to have begun falling at least in the early 1980's, but I think earlier than that. I have very sketchy research that it may in fact have been falling since the WW2 era.</li> <li data-xf-list-type="ul">In the 1970's and before it was at an average of 700 ng/dl. As you know today's average is about 400 ng/dl. It has been steadily falling over the decades. That's a much bigger decline than these studies that show it falling 20% or whatever since the year 2000 or something like that.</li> <li data-xf-list-type="ul">Regions it has fallen hard: North America, Latin America, All of Europe, East Asia, Kazakhstan. These are the 700 dropping to 400 places.</li> <li data-xf-list-type="ul">It has fallen less in the Middle East, North Africa, Southeast Asia.</li> <li data-xf-list-type="ul">It is still high, no drop, in most of Subsaharan Africa, Central Asia (except Kazakhstan), and Siberia. These places are still around 700 ng/dl on average.</li> <li data-xf-list-type="ul">In Central America and Kazakhstan it is extraordinarily low - Kazakhstan is in the low 300's on average. Kazakhstan also has a very high incidence of reproductive organ developmental defects and conditions. To me it's clear that there's something weird going on there, in the environment. Perhaps it is radiation from the Soviet nuclear testing that was done in Kazakhstan for decades?</li> <li data-xf-list-type="ul">Everywhere that I could see originally had equivalent testosterone levels, which were plenty high naturally, around 700 ng/dl. So I don't think there's much of any "natural" variation of testosterone levels by region. It seems to be due to some kind of environmental stressor.</li> <li data-xf-list-type="ul">Hunter-gatherers and nomadic tribes mostly have very high testosterone, just as you might have guessed. Most of them are something like 900 ng/dl on average. However, there are a few that are not so high. This is probably due to plain malnutrition.</li> <li data-xf-list-type="ul">I did some very questionable research, by looking up historical testicle size (haha i know) that suggested testosterone may have been about 900 ng/dl on average in the western world in the 18th,19th, and the first half of the 20th centuries.</li> </ul><p></p><p>I found that low testosterone in a region correlated with two things that I checked for:</p><ul> <li data-xf-list-type="ul">Agricultural chemicals used (Latin America uses a ton of them, Subsaharan Africa currently doesn't)</li> <li data-xf-list-type="ul">Polyunsaturated fat (PUFA) in the diet (the worst kind is the degraded omega-6 seed oils that junk food is fried in) And PUFA consumption also correlates with low test in individuals too.</li> </ul><p>[ATTACH=full]26600[/ATTACH]</p><p>[ATTACH=full]26601[/ATTACH]</p></blockquote><p></p>
[QUOTE="doyouwantbirds, post: 237938, member: 44567"] So I've been looking into this for a while and got dissatisfied with the research. I had some questions - how long has it actually been falling and do levels differ around the world? (this could tell us what is causing the drop) I found an incredible lack of published research into those questions, so I aggregated the results of about 1000 individual unrelated studies to answer my questions. Here's my site for more detailed info: [URL="https://testosteronedecline.com/testosterone-levels-100-years-ago/"]Testosterone Levels 100 Years Ago - TestosteroneDecline.com[/URL] Here's what I found: [LIST] [*]It's hard to tell, but testosterone appears to have begun falling at least in the early 1980's, but I think earlier than that. I have very sketchy research that it may in fact have been falling since the WW2 era. [*]In the 1970's and before it was at an average of 700 ng/dl. As you know today's average is about 400 ng/dl. It has been steadily falling over the decades. That's a much bigger decline than these studies that show it falling 20% or whatever since the year 2000 or something like that. [*]Regions it has fallen hard: North America, Latin America, All of Europe, East Asia, Kazakhstan. These are the 700 dropping to 400 places. [*]It has fallen less in the Middle East, North Africa, Southeast Asia. [*]It is still high, no drop, in most of Subsaharan Africa, Central Asia (except Kazakhstan), and Siberia. These places are still around 700 ng/dl on average. [*]In Central America and Kazakhstan it is extraordinarily low - Kazakhstan is in the low 300's on average. Kazakhstan also has a very high incidence of reproductive organ developmental defects and conditions. To me it's clear that there's something weird going on there, in the environment. Perhaps it is radiation from the Soviet nuclear testing that was done in Kazakhstan for decades? [*]Everywhere that I could see originally had equivalent testosterone levels, which were plenty high naturally, around 700 ng/dl. So I don't think there's much of any "natural" variation of testosterone levels by region. It seems to be due to some kind of environmental stressor. [*]Hunter-gatherers and nomadic tribes mostly have very high testosterone, just as you might have guessed. Most of them are something like 900 ng/dl on average. However, there are a few that are not so high. This is probably due to plain malnutrition. [*]I did some very questionable research, by looking up historical testicle size (haha i know) that suggested testosterone may have been about 900 ng/dl on average in the western world in the 18th,19th, and the first half of the 20th centuries. [/LIST] I found that low testosterone in a region correlated with two things that I checked for: [LIST] [*]Agricultural chemicals used (Latin America uses a ton of them, Subsaharan Africa currently doesn't) [*]Polyunsaturated fat (PUFA) in the diet (the worst kind is the degraded omega-6 seed oils that junk food is fried in) And PUFA consumption also correlates with low test in individuals too. [/LIST] [ATTACH type="full"]26600[/ATTACH] [ATTACH type="full"]26601[/ATTACH] [/QUOTE]
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Testosterone Replacement, Low T, HCG, & Beyond
Testosterone and Men's Health Articles
Decline in Serum Testosterone Levels Among Adolescent and Young Adult Men in the USA
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