Prehistoric humans ate a variety of foods and often waited all day (or longer) for a proper meal. Constant movement was the norm. Walking, running, and carrying were interspersed with brief bouts of more intense effort. Yet there was plenty of time for leisure and family: Anthropologists estimate that ancient humans “worked” only thirty hours a week. They lived and worked in tight-knit communities in which face-to-face communication was the only option. And of course they got plenty of sleep, going to bed when it was dark and rising with the sun. We’re the descendants of those ancient humans,
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