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ZorbaTHut  2yr ago (text post)   5684 thread views

Small-Scale Question Sunday for September 18, 2022

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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Two reasons this doesn't seem plausible: frequent migration and frequent changes of diet. We find wheat cultivated 10k years ago, and that's obviously just a lower bound, it might've been so before that without evidence. But - "and Germany and Spain by 5000 BC". 5k years is enough time for some evolution, but how much? And humans and ancestors, over a million years of evolution, would've had to adapt to many different kinds of food, leading to all humans today being able to survive on a wide range of diets.

There certainly are adaptations to different foods among different people - but how significant are these, and adaptations to what, and do they have much to do with modern diets? not sure.

If you look at skin colour, it is clear that, over a few thousand years, we can adapt to local conditions despite migration. We don't need to keep adaptations for conditions from millions of years ago. We can just be adapted to the conditions of the last few thousand years.

Natural selection takes a long time to bring a new mutation to significant frequency in the population, but if a genetic variant is already common in a population - as it would be if two populations have recently mixed together and the variant was common in one of the populations - it wouldn't take long to spread to nearly everyone if there is strong selection.

Yes, but - if the variant was already present, and if there was strong selection. This is going to be true for some variants - but which variants, and what effect they have, is a question! Humans lived in europe for a long time before skin color adapted. So concluding 'if you are from the mediterranean historically, then eat what they eat there' is not going to work well.

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