The cover story of the May issue of Scientific American is titled "What Makes Us Human?" On page 48 it describes how humans have copies of the gene that allows digestion of starch; way more copies than other primates.
The author also states with absolute confidence that around 9,000 years ago the human genome changed so as to allow adults to digest lactose. This made it reasonable to drink milk from animals.
She explains that these adaptations endured because they happened after certain events in history. One is the conquest of fire more than a million years ago. Does this mean humans adapted genetically to thrive on cooked food? The shift relating to starch occurred after the agricultural revolution about 10,000 years ago.
The article goes on to explain why so many Asians and Latin Americans are lactose intolerant. Supposedly the milk-digesting gene didn't develop because their ancient ancestors weren't herders, so using milk wasn't necessary.
Up until now, I've been convinced that what Dr. Graham describes in 80/10/10 was the natural diet for all people to thrive on. And what about the China Study? Where I live, getting the discipline to follow anything other than SAD is enough of a head trip. I'm confused as hell. When I come across facts like those in Scientific American it makes me start to doubt everything.
Tags: 80/10/10, dairy, grains
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