Anonymous at Fri, 14 Mar 2025 21:28:06 UTC No. 16619047

>>16619031
It doesn't contradict what we've done with age of consent laws at all!

Anonymous at Fri, 14 Mar 2025 21:33:28 UTC No. 16619051

What are a few candidates suspected of causing it?
Endocrine disrupting plastics seem a big one.
Maybe obesity and malnutrition

Anonymous at Fri, 14 Mar 2025 21:44:51 UTC No. 16619062

>>16619051
Definitely environmental microplastics.

Anonymous at Fri, 14 Mar 2025 21:46:15 UTC No. 16619063

>>16619031
Imagine if the entirety of this chart was sampling error.

Anonymous at Fri, 14 Mar 2025 21:48:51 UTC No. 16619067

>fertile 3-4 years younger
>brain 3-4 years less developed
society is fucked

Anonymous at Fri, 14 Mar 2025 21:51:01 UTC No. 16619068

A bit tangential and a cross species comparison but with dairy cattle you aim to have the cows calve down at around 2 years old so they need to be in calf at 15 months old (9 month gestation).
Percentage of adult body mass is a crucial determinant of when they start puberty so you can influence it to be even younger or later say 10-12 months of age with a high enough plain of nutrition. I remember reading that there can be issues with this if they develop too much fat in the udder. also the feed protein quality needs to higher to sustain these growth rates.
I think for holsteins the reccommendations were that they should be 350kg or 40-45% of adult weight at conception starting from a birth weight of about 40kg and a growth rate around 700g/d

I was always a little curious whether the same effect was seen in humans, obviously cattle grow so fast that they can generally grow large enough to safely give birth but I don't think the same is true for humans

Anonymous at Sat, 15 Mar 2025 05:50:12 UTC No. 16619517

The early industrial revolution epoch is a horrible famine time period.

Historically menarch in prim and agro-societies would have been around 13-15 anyway.

Anonymous at Sun, 16 Mar 2025 08:01:00 UTC No. 16620540

>>16619031
menarche is at 8-11 now and thats just the start, perios are irregular and also cause massive pain which is then treated with birth control pills and other hormone drugs that fuck females even harder, turns out plastics and toxins in the water are actually toxic :O
>>16619051
c-section births, early placenta clamping, 90 shots of vaccines, EMF, polyester, pharma drugs, estrogen and other endocrine disruptors, stress in mother, chlorine in water nuking mothers and childs biome in the gut, massive iodine defficiency, cleaning agents and chemicals in fabric softeners that rub on your skin 24/7 that you absorb 10x better directly into bloodstream bypassing liver

Anonymous at Sun, 16 Mar 2025 11:01:07 UTC No. 16620619

>>16619051
>>16619062
Ah yes, the famous plastics of 1860s

Anonymous at Sun, 16 Mar 2025 17:39:51 UTC No. 16620965

>>16620619
>nope, i did not read picrel
>did i miss something?

Anonymous at Sun, 16 Mar 2025 19:06:17 UTC No. 16621046

>>16619068
I heard that menarche starts in girls when they pass 40 kg. So excessive calories can explain the graph.

Anonymous at Mon, 17 Mar 2025 08:38:38 UTC No. 16621460

>>16621046
I imagine there's some degree of racial variation.

I seem to remember heifers being able to get pregnant at 5 months old which is going to mess with the transferability of this metric.since they'd only be maybe 150kg at that age.

there must be some medical data on puberty and human growth rates right? if anime is to be trusted the japanese have regular growth and weight checks that include a chest diameter reading which would tie into menarche