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Sperm Count Zero

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Re: Sperm Count Zero

#121

Post by christinamltn »

sytelus wrote: post #95

I 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…

Those stats don't imply anything about fertility rates. IVF has gotten far more accessible and affordable since the early 1980s. The 1 in 8 stat was likely just as true in 1984, it just meant they'd been trying for a year without success. Now that gets you a referral to a clinic (and you're more likely to accept that referral).

Re: Sperm Count Zero

#123

Post by 300bps »

zaroth wrote: post #33
300bps wrote: post #17

studies 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?

My initial thought when I read the “the problem is right in front of us” interlude was, oh they’re gonna blame PornHub! Since masterbation decreases sperm count. But when they got into the other physiological symptoms, that definitely isn’t gonna explain it.

In addition to sperm count, studies show masturbation also lowers testosterone levels.

https://www.ncbi.nlm.nih.gov/m/pubmed/11760788/

This study showed a 150% increase in testosterone seven days of abstinence.

Re: Sperm Count Zero

#124

Post by alexandercrohde »

alexandercrohde wrote: post #42
agorabinary wrote: post #7

Any other reliable sources on this beyond GQ?

There are actually well over 100 studies on this from different regions and periods. Google scholar can help.

Why is this downvoted? Simply putting in "sperm count decline" into google scholar gives over 42,000 papers.

Lay people need to understand that this is not just some off-the-cuff casual theory, but a very-well-researched 30-year-trend.

Re: Sperm Count Zero

#125

Post by sixstringbudha »

Youden wrote: post #106
spraak wrote: post #81

Earlier quoted context omitted.

I'm wondering if the downvotes are from me not citing sources or from people getting triggered.

Definitely the former. HN doesn't take well to people making unsubstantiated assertions. If you want to make a statement like this, don't bother unless you have evidence. It's also usually better to frame it around the evidence, like "this study from UCLA found that higher consumption of animal products led to decreased testosterone levels". This way, the discussion will be focused on the evidence or the conclusion y…

>HN doesn't take well to people making unsubstantiated assertions.

ooooo..scary.

Tell something that fits with the hive mind narrative and HN will give you all its love without asking for no citation. (I mean, some one might ask for it, but HN will take care of flagging it and make it disappear). So do all forums where there is an ability for people to down vote stuff.

Re: Sperm Count Zero

#126

Post by konschubert »

Okay, really naive question: Could it be that the measured sperm count per ejaculation is getting lower because men are ejaculating more frequently?

Or is this being considered in these studies?

Re: Sperm Count Zero

#127

Post by no_identd »

...I'll just leave this here:

https://molecularcytogenetics.biomedcentral.com/articles/10....

Stindl, Reinhard - The paradox of longer sperm telomeres in older men’s testes: a birth-cohort effect caused by transgenerational telomere erosion in the female germline [2016]

Citations here: https://scholar.google.com/scholar?cites=1431836715271366014...

Which leads us, among other things, to the following papers:

https://journals.lww.com/co-obgyn/Abstract/2018/06000/Should...

Balmori, Carlos; Varela, Elisa - Should we consider telomere length and telomerase activity in male factor infertility? [2018]

https://www.biorxiv.org/content/early/2018/03/05/276030

Delgado et al. [22 Authors in total!] - The contribution of parent-to-offspring transmission of telomeres to the heritability of telomere length in humans [2018]

And to this:

http://www.pnas.org/content/early/2018/02/20/1707337115.long

Xie et al. [28 authors in total!] - Epigenetic alterations in longevity regulators, reduced life span, and exacerbated aging-related pathology in old father offspring mice [2018]

Which itself has citations, here: https://scholar.google.com/scholar?cites=1010309427616177024...

Leading us, pardon the pun, to, among other things, this:

https://www.sciencedirect.com/science/article/pii/S0161813X1...

Maloney et al. - Latent consequences of early-life lead (Pb) exposure and the future: Addressing the Pb crisis [2018]

As the first handful articles I've linked here now show, we have a hell of a lot more issues than just endocrine disruptors: evolution will mess with us, come hell or high water!

PLUS endocrine disruptors already causes a lot of problems, as the OP article outlines, AND as that last article I linked also shows us.

Re: Sperm Count Zero

#128

Post by fullmoon »

spraak wrote: post #54
Nomentatus wrote: post #14

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.

But consumption of animal products have dropped since the 70s.

Re: Sperm Count Zero

#129

Post by WalterSear »

gaius wrote: post #111
spraak wrote: post #54

Earlier 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?

80's myth. It's been ruled out by population studies in Asia.

Re: Sperm Count Zero

#130

Post by hokkos »

spraak wrote: post #115
sheepmullet wrote: post #97

Earlier 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…

Nutritionfact is a poor science site pushing an undisclosed vegan agenda using chery picked studies.
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