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by tzs 397 days ago
To get some idea of how efficient we can be look at studies of the Hadza, a tribe of hunter-gatherers in Tanzania, described here [1]. The men spend the day walking around hunting, or if they can't find game climbing trees to get honey, yet burn about the same amount of calories as sedentary men in western industrialized societies. The women spend all day moving around foraging and the results are similar.

[1] https://en.wikipedia.org/wiki/Exercise_paradox