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Thread: The puzzle of the international age of first menstruation10 days old

  1. #21
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    Also any part of the world where sustenance farming is common will be prone to famine caused by drought and flooding. What protects much of the West from mass famine, in addition to industrial farming, is a complex system of trade agreements, that much maligned neoliberal capitalism, which people on both the political far-right and far-left are trying to break up, which allows food to easily be imported to a drought-effected area from other countries. Wasn't it only 3 or 4 years ago that the main farming areas of the USA experienced drought? Americans likely did not notice because thanks to NAFTA, food shelves were well stocked with produce from Mexico and Canada.

    I dunno, as someone who is interested in markets, and studying history, I have noticed that cultures from cold northern climates are more into those types of trade arrangements and have been for centuries. These areas have harsh winters and short growing seasons which could be ruined by droughts or floods so importing would be necessary. Northern Europeans and Indigenous Canadians were free traders for centuries. There were excellent trading cultures elsewhere like in the Middle East, of course, but they often placed levies and tariffs on products, Northern cultures were free traders, though. And it's countries inhabited by those descendants who are generally more open to free trade today. Must be a long cultural thing.

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  4. #22
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    This figure comes from Wyshak et al, 1982, "Evidence for a Secular Trend in Age of Menarche." The best-fit line represents a decline of the age of menarche across Europe of 2.3 months per decade. Every nation of Europe so studied has seen a decline since the 19th century. So, I think the trend is best explained not by some sort of poisoning but by whatever also explains similar secular trends such as intelligence, brain size, fertility and height. The trend is an adaptation, not a disease. I prefer the explanation of epigenetic phase shifts. The study claims that the trend hit the floor in the USA, but a subsequent study has shown that the decline continued for black girls and white girls in America (Krieger et al, 2014, "Age at Menarche"). And the general trend has continued since 1980 not just in Europe and USA but everywhere.


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