How come your body burns 2000 calories a day by existing, but running a mile only burns 100 calories?
In: Biology
A couple of interesting things.
a) The brain is estimated to use around 20% of the calories used (not including additional exercise).
b) The body has to breathe (lungs), circulate blood (heart), run the brain, digest food, filter waste, run the sensory organs, keep the body at optimal temperature, fight potential infections, regrow cells that are lost etc etc. The human body is never NOT doing something just to keep it alive.
c) Humans are rather efficient at 2 legged motion. Even among all the different animal species, humans are nearly at the top of the endurance chart. We’ve evolved to travel very long distances on foot and hence we don’t burn too many calories when jogging or walking. Humans are rather good at it.
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