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Kindness is peak human performance and high status.

Kindness requires metabolic abundance: the capacity to override primal impulses, regulate emotions, and extend empathy.

Meanness is dirty energy: high cortisol, inflammation and an exhausted executive function.

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A single night of 4–5 hrs sleep reduces cognition by 20–40%, drops glucose stability by 30–40%, increases accident risk by 400%, elevates inflammatory markers 50–100%, impairs memory consolidation by 40–60%.

Most mental health problems are downstream this system level deregulation.