Occasionally you come across a little bit of information that tells a truth that it was never intending to tell.
Some years ago, I looked at the spread of the cultivation of ancient grains over time as a proxy for the general location where Noah's Ark made landfall after the flood.
This 1996 study from the Journal of Allergy falls into that category.
Hypersensitivity to pollen of Olea europaea in IsraelIts abstract provides the relevant information.
"The incidence of skin-tested sensitivity to olive pollen allergens among subjects with suspected atopic respiratory allergy was investigated in various populations of Israelis. This incidence was correlated with the olive cultivars, with the abundance of trees in the patient's neighborhoods, and with the history of exposure of the studied populations to olive pollen. Positive skin reactions to olive pollen, among atopic patients of the Jewish population, is rather high where olive trees are abundant (66%), and lower (29%) where trees are scarce (P < 0.003). Sensitization was significantly lower (P < 0.003) among a population of Israeli atopic Arabs (16%), though these Arabs have lived in an olive-rich area for several generations."
The TL;DR for this is that a large percentage of people who are supposedly native to the region are actually far more allergic to the olive trees that define that region than the Arabs (who are genetically semites). The obvious conclusions of this article - that a large segment of the Israeli population is not actually native to the Holy Land - are rejected by Zionists because they say that this only speaks of people referred to allergy clinics. While that may be true, it still doesn't explain the large difference (66% vs 16%) among that patient population that was in fact referred.
This study does give weight to the idea that the majority Ashkenazi population of Israel is in fact a European population of people who practice Judaism and have no historic claim to land in the middle east as they are not descendants of Abraham