Significant changes have occurred in the human diet since the dawn of humankind/
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Early human beings shifted from a diet of primarily unprocessed plant foods to one containing increasing amounts of meat, some of which was scavenged.
Our ancestors began the deliberate hunting of animals.
The most substantial changes in the human diet have occurred since:
Introduction of grains and dairy.
Introduction of chemical / mechanical food processing and preservation.
Introduction of synthetic agricultural chemicals and increased mechanisation
Not to scale, but you get the idea.
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