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Human Evolution / Re: Aryan teeth
« on: September 07, 2024, 08:28:56 pm »
According to this information, the teeth crowding/jaw-size reduction that followed the Neolithic is more likely a lifestyle effect than a genetic one at this stage. So, it'd probably be a much more reliable indicator of one's genetic adaptation to an agrarian lifestyle if they have a smaller jaw without teeth crowding.
That being said, modern meat-eaters can't be expected to have wider jaws than vegans/vegetarians except possibly as an indication of being more caveman-like, but in the long-run, unless vegans for some reason become the most avid processed-food eaters, jaw width should increase for them (due to the inclusion of more fibrous, lower calorie foods) and decrease for those following a Standard Western Diet and perhaps even carnivore diet.
https://en.wikipedia.org/wiki/Human_jaw_shrinkage
That being said, modern meat-eaters can't be expected to have wider jaws than vegans/vegetarians except possibly as an indication of being more caveman-like, but in the long-run, unless vegans for some reason become the most avid processed-food eaters, jaw width should increase for them (due to the inclusion of more fibrous, lower calorie foods) and decrease for those following a Standard Western Diet and perhaps even carnivore diet.
https://en.wikipedia.org/wiki/Human_jaw_shrinkage
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This short length of time, relative to evolutionary timescale, means human genetics are still essentially the same as before these modern changes in lifestyle practices.
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The main contributing factor to the recent increase in malocclusion is widely considered to be due to a sharp reduction in chewing stress, especially during critical periods of craniofacial growth. Experiments done on non-human subjects have shown that induced nasal blockages and/or dietary changes earlier in life lead to maladaptive morphological change in their jaws, intended to simulate what we are observing globally in human children. Significant craniofacial changes due to diet have even been experimentally shown in pigs during development; researchers fed groups either a hard-consistency diet or a soft-consistency diet, for eight months in total. Drastic differences in jaw and facial musculature, facial structure, and tooth-crowding were observed; researchers directly related the findings to what we are observing more in human populations.