http://www.macleans.ca/society/health/eat-like-your-grandma-why-you-should-skip-the-kale-salad/
I have found this to be pretty true (in my case). I am a 1st Gen Asian born in America. All the "diet experts" kept touting about how "bad" white rice is, however I can probably for a fact trace back the consumption of rice back many many many generations. My genes (and enzymes) are tailored for it. So despite these experts, I continue to eat with no problem. My body, however, rejects dairy (cows milk), since it was never part of my family ancestry. I do love ice cream though and am willing to suffer for it on occasion.

Anyway, thought this was an interesting read. I hope to purchase one of the two books mentioned to get more insight. CHEERS!