In mammals generally testosterone levels and photoperiod are very closely linked. It would be surprising if our increasing use (abuse) or artificial light didn't sharply drop our testosterone levels.
Testosterone also drops from high consumption of animal products.
Sperm Count Zero
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Re: Sperm Count Zero
#112Earlier quoted context omitted.
This submission was made by a 5-year HN user with 14000 karma. Although I don't know if you've been more active with a different handle, which is certainly very possible, the account whose submission you're complaining about has been active 27 times as long as yours and has 91 times as much karma as yours... suggesting a history of reasonably good-faith contribution to HN. Edit: it's true that his submissions aren't…
It doesn't matter how much karma someone has. A repost is a repost, and it's ok to point it out.
Re: Sperm Count Zero
#113I wonder how substantiated these numbers are but I can't deny that IVF facilities have been very very busy all over. In Canada, fertility treatment rate increased to 15.7% in 2011, up from 5.4% in 1984. It is a safe bet that 1 in 8 couples you know probably have visited fertility clinic[1]. Also, does this apply to China/India or just Western world? If no then I would worry about all the tech that has gotten in to ou…
All of these are common in China as well. There is a lucrative business in importing baby formula from Western countries due to past food safety scandals.
But maybe the differing onset of that kind of pollution would still allow treating it as a natural experiment.
Re: Sperm Count Zero
#114Earlier quoted context omitted.
Testosterone also drops from high consumption of animal products.
Testosterone drops from high consumption of soy products too, so what are you going to do?
[1] Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis.
https://www.ncbi.nlm.nih.gov/pubmed/19524224
[2] Soybean isoflavone exposure does not have feminizing effects on men: a critical examination of the clinical evidence.
Re: Sperm Count Zero
#115Earlier quoted context omitted.
Testosterone also drops from high consumption of animal products.
> Testosterone also drops from high consumption of animal products. Does it? As far as I can tell high levels of saturated fat increases testosterone levels.
https://nutritionfacts.org/video/the-effect-of-animal-protei...
> After the intake of cow milk, serum estrone (E1) and progesterone concentrations significantly increased, and serum luteinizing hormone, follicle-stimulating hormone and testosterone significantly decreased in men
Re: Sperm Count Zero
#116I had heard that sperm counts are dropping. What was news to me was that the decline is continuing, even accelerating, and also the concomitant drop in testosterone levels, starting even in utero. The bit about AGD was also pretty crazy — followed by the bit about men becoming less male . Some fear-mongering there no doubt, but a topic which in this era is more likely to be met with scoffs of “good riddance” rather t…
I’ve got a hypothesis that there is a set amount of testosterone possible in the world (or social group). More males = less to go around. It would make sense from a not-constantly-on-edge perspective as the amount of males per unit of territory goes up. Just a hypothesis, could make for interesting research.
Re: Sperm Count Zero
#117studies with sample collection only after 1995—and the slope was even steeper. So that could not explain the decline we see after 1995.” That’s about the time high speed pornography became available en masse. Coincidence?
Re: Sperm Count Zero
#118Lack of exercise, poor diet, extremely feminine culture, absolute taboo of violence, endocrine disruptors.
Re: Sperm Count Zero
#119Earlier quoted context omitted.
> Testosterone also drops from high consumption of animal products. Does it? As far as I can tell high levels of saturated fat increases testosterone levels.
> If you take men on a high-protein diet—”meat, fish, poultry, egg white[s]”—and switch them to a high-carb diet of “bread, vegetables, fruit, and [sugary junk,]” their cortisol levels drop about a quarter within ten days. At the same time, their testosterone levels shoot up by about the same amount. https://nutritionfacts.org/video/the-effect-of-animal-protei... > After the intake of cow milk, serum estrone (E1) and…
The first one seems to be about low carb vs high carb - where was the meat + carb vs no meat + high-carb comparison?
The second seems to be specific to milk and not animal products in general.
Re: Sperm Count Zero
#120Earlier quoted context omitted.
likely to be met with scoffs of “good riddance” My first thought was that this may also cast light on the rise of the trans rights movement. If men are becoming less male, surely this relates to so many people saying "I'm really a woman trapped in a man's body." or vice versa. This may also help explain why trans people are so often met with open hostility as "freaks" etc. No, I am not defending their mistreatment. B…
> I personally like "manly men" and that's also not a PC thing to admit to there's nothing political about liking what you like. You don't need to justify yourself, your preferences or their reasonings to anyone. That's half the point of the sexual liberation movement. > I'm a fairly traditionally feminine woman and spent a couple of decades as a homemaker and full-time mom. I am routinely met with open hostility fro…