This one is really obvious:
www.sciencedaily.com/releases/2019/06/190604084857.htm"We found that people differ in how efficiently their bodies can manage blood sugar levels, resulting from an evolutionary process that seems to have been brought about by changing diets," said the study's lead author, Professor Frances Brodsky, Director of UCL Biosciences.
The researchers were investigating the CLTCL1 gene, which directs production of the CHC22 protein that plays a key role in regulating a glucose transporter in our fat and muscle cells.
...
In humans, by looking at the genomes of 2,504 people from the global 1000 Genomes Project, they found that almost half of the people in many ethnic groups have a variant of CHC22 that is produced by a mutated gene, which became more common as people developed cooking and farming.
The researchers also looked at genomes of ancient humans, and found that the newer variant is more common in ancient and modern farming populations than in hunter-gatherers, suggesting that increased consumption of carbohydrates could have been the selective force driving the genetic adaptation.
...
The researchers say that while this genetic variant does not play a direct role in the development of diabetes, having the older variant may make people more likely to develop diabetes, and it may also exacerbate insulin resistance involved in diabetes.
"People with the older variant may need to be more careful of their carb intake, but more research is needed to understand how the genetic variant we found can impact our physiology," added Professor Brodsky.
As I have said before, it is no coincidence that low-carb diets are promoted in rightist circles.
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advances.sciencemag.org/content/4/11/eaau4921
The most extreme signal may represent adaptations to an agricultural subsistence and diet. The top-ranked gene, MGAM, is associated with starch digestion (43). The associated high-frequency SNPs in the ancient Andean population (table S4) exhibit chromatin marks in cells from the gastrointestinal tract (Fig. 5A). The variant may be highly differentiated between the ancient Andeans and the lowlanders (the Huilliche-Pehuenche) because of differences in subsistence strategies. The Huilliche-Pehuenche individuals are traditionally hunter-gatherers, with archeological evidence suggesting that their ancestors have been practicing this mode of subsistence for thousands of years in the region before European contact in the 1500s (44). In contrast, the Andes is one of the oldest New World centers for agriculture, which included starch-rich plants such as maize (~4000 years BP) (45) and the potato (~3400 years BP) (7). Selection acting on the MGAM gene in the ancient Andeans may represent an adaptive response to greater reliance upon starchy domesticates. Recent archeological findings based on dental wear patterns and microbotanical remains similarly suggest that intensive tuber processing and thus selective pressures for enhanced starch digestion began at least 7000 years ago (7, 32). Furthermore, we see a similar signal (top 0.01%) when we contrast the hunter-gatherers from Brazil [Karitiana/Surui, sequence data (46)] with the ancient Andeans, as well as with the Aymara versus the Huilliche-Pehuenche and the Karitiana/Surui. One further note, we did not detect amylase high copy number in the ancient Andes population before European contact, suggesting a different evolutionary path for starch digestion in the Andes when contrasted with Europeans (47).
It turns out that not all Aryans have what we have in the past called "Aryan saliva". In light of this new information, I guess a more accurate term for amylase high copy number would be
Old World Aryan saliva. Atlanteans instead apparently have more Aryan gastric juice than Old World Aryans.