This observation / hypothesis is due to lifestyles differences between the two time periods. (brianpalmerdds.com)
But over time, environmental factors such as chemical exposure, diet and other lifestyle differences can alter these markers. (blessthebullys.com)
The research identified the same variant in East Asian and West African populations, although no human health or lifestyle differences linked to the variant have been detected so far. (frontlinegenomics.com)