I just want to add a thought about how human biology evolved: australophitecus already was hunting, and subsequent evolution selected for the best hunters. Huma

I just want to add a thought about how human biology evolved: australophitecus already was hunting, and subsequent evolution selected for the best hunters. Humans became such successful hunters that we hunted megafauna to extinction. Obviously that environment doesn't exist anymore but biologically speaking, we have simply not evolved for abundance. On the contrary, we are able to go for very long without eating. Even people at their ideal weight have about 100k calories stored. That's 30 days of high energetic expenditure. Interestingly, anyone who has done a long (3-5+ days) fast knows one drops in a mental and physical state that feels very much tailored to better hunting. Reduced need for sleep, antidepressive and procognitive effects, etc. [edit]: I guess the part about humans evolving with scarcity is not entirely accurate, what we can see for sure is there is some adaptation to surviving without eating; this is not a common trait, other species have much inferior ability to store fat.