U Chicago researchers studying Paleo diet determined that big brains needed carbs. Dietary carbohydrates in human evolution was important.
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Summary of the finding:
Understanding how and why we evolved such large brains is one of the most puzzling issues in the study of human evolution. A new study argues that carbohydrate consumption, particularly in the form of starch, was critical for the accelerated expansion of the human brain over the last million years. Eating meat may have kick-started the evolution of bigger brains, but cooked starchy foods together with more salivary amylase genes made us smarter still.
Reddit comment on Starches Consumed Throughout History
Barley – Middle East for 11,000 years Corn (maize) – North, Central, and South America for 7,000 years Legumes – Americas, Asia, and Europe for 6,000 years Millet – Africa for 6,000 years Oats – Middle East for 11,000 years Potatoes – South America (Andes) for 13,000 years Sorghum – East Africa for 6,000 years Sweet Potatoes – South America and Caribbean for 5,000 years Rice – Asia for more than 10,000 years Rye – Asia for 5000 years Wheat – Near East for 10,000 years