From Robb Wolf's book: "Let's look at this question in a way that paints the human history in a relative scale. If we stood on an American football field we co

From Robb Wolf's book: "Let's look at this question in a way that paints the human history in a relative scale. If we stood on an American football field we could represent a timeline of human history in the following way: If we started walking from one end-zone toward the other we could walk 99.5 yards, and this would represent all of human history except the last 5,000 years or so... 99.5 of the 100 yards. This is when our genetics were selected for survival in a hunting-gathering lifeway and we were damn good at it. We evolved and adapted to this way of living and the interaction of our genetics and our environment made us who we were, and who we are. Our genetics are virtually identical to those of our early human ancestors from more than 120,000 years ago. The last 10,000 years, the time in which we transitioned from the hunting and gathering lifeway to agriculture, is the last half yard of our timeline." Here's a source for some of this stuff if you're interested : http://www.nature.com/ejcn/journal/v56/n12/full/1601646a.html http://www.nature.com/ejcn/journal/v56/n12/full/1601646a.htm... It's interesting that flour usage may date back 100k years. However the earliest use is not important. What is important is the start of widespread use. This is when our diets shifted and is the absolute earliest that man-kind as a whole could have even begun to evolve for such food sources.