All organisms on the planet have the "desire" to procreate. In the case of a plant, such as a berry plant, the organism creates an edible flower with it's seeds. The seeds are not digestible and pass with nature's fertilizer (feces). This is how many fruit plants procreate. In the case of grains (most grains but wheat barley rye especially) they are NOT edible raw. That is their means of procreation. The neolithic era began when humans harvested and processed grains for consumption. Despite processing grains, we have not removed the toxins from the grain. Fortunately, the grain provided some form of sustanance and allowed paleolithic man to become neolithic man. Unfortunately, the toxin is still toxic. This is why a carb from a grain does not equal a carb from a berry and thus why a grain free diet is very successful in weight loss. Robb Wolf's book "The Paleolithic Solution" is the best book I have ever read in laying out reasons why grains are detrimental to health.
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