Some of the differences are known when it comes to disposing of surplus iron in their diet ~
“While genetic, lifestyle and dietary factors may account for this difference,” Makhoul said, “it is reasonable to ask, based on our findings, whether the lower prevalence of diabetes in this population might be attributed, at least in part, to their high consumption of omega-3-rich fish.”
Yes, that is the problem with many of these studies. You take a group of people who are genetically similar and different from other populations, and you cannot say that what applies to them applies to others.
I still may up my krill oil intake some. I don’t think it will hurt and it might help.