Undoing of the effects of excessive and unnecessary social guidance takes ages.
At some point through the times of civilizations, humans started having less work to do and more idle people around. The idle people started spending their time for preaching a life style other than what was evolved naturally through centuries and millennia. They redefined the meaning of health, food, comfort and happiness. The silliest thing they did was creating norms, redefining good and bad based on their perception of comfort and happiness and enforcing those norms on populations.
Human race continued to live under the clutches of perceptions from these free-thinking idle people whose mind worked detached from their bodies and thus lacked the knowledge gained from the millennia of human evolution.
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