re: Switching to vegetarian diet

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Yep! Meat was more of a delicacy bc it took days and weeks to sometimes kill an animal.

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And yet, humans can safely fast for days while tracking prey. It seems that fasting is some built-in hardware to helped them obtain caloric-dense food.

Humans burn fat first for energy. It is the preferred fuel. In a fasted state, humans preserved lean muscle tissue over fat until fat stores are gone. It is much more energy expensive to burn muscle than fat.