There is a great game being played in the molecular biology world genome analysis . It is possible to trace the migration of peoples across he world and long standing theories for the migrations are being tested. It is quite a thought that mankind evolved in Africa and then was able o slowly move to Australia and down the Americas to geographical isolation thereafter.
In addition here are the great Trade route, eg the Silk Road wherein traders brought goods to and from China to the coast of the Mediterranean Sea.
Arabia has served as a strategic crossroads for human dissemination , providing natural connection between the distant populations: of China and India in the east to the western civilizations along the Mediterranean.
In the paper the authors explore this region’s critical role in the migratory episodes leaving Africa to Eurasia and back, using high resolution Y chromosome analysis of males from the United Arab Emirates. Qatar and Yemen .
With the exception of Yemen, southern Arabi, South Iran and South Pakistan show high diversity in their Y-haptogroup substructure possibly as a result of gene flow along the coastal crescent shaped corridor of the Gulf of Oman facilitating human dispersals. Increased rates of marriages between close relatives may have an impact in Yemen and Qatar, which experience significant heterozygote deficiencies at various hypervariable autosomal STR loci.
What interest is this to an nutritionist. Wel, any theory which purports to attribute environmental change eg diet to a particular health problem must bear in mind the diversity of the human population or lack of diversity in a particular population.
Cadenas et al 2008 Y-chromosome diversity characterizes the Gulf of Oman , European Journal of Human Genetics. Vol 16, 374-386

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