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Why did our brains stop expanding?
In the forest the human brain was expanding and expanding at a phenomenal rate. Sometime at around 200,000 to 150,000 years ago, this process came to an end. The brain stopped expanding and started to shrink. This key point in our evolutionary journey has been noted but rarely addressed, and its significance comprehensively ignored.
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This very recent period of brain shrinkage coincides with a major dietary change, for it was around this period that cereals and grain (grass seed) came to the fore.
Cereals and grains may be the foundation of our diet today and responsible for the huge explosion in our numbers, but they may not be the best foods for optimal function. Indeed, studies of skeletons from early agricultural societies show that ill health accompanies the initial transition to eating more grains and cereals.
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