How come your body burns 2000 calories a day by existing, but running a mile only burns 100 calories?
In: Biology
>How come your body burns 2000 calories a day by existing, but running a mile only burns 100 calories?
Your body is a bioreactor that constantly transforms stuff into other stuff, pumps stuff from one thing into a different thing, opens and closes valves, sends tons of electrical impulses everywhere and needs to keep itself toasty at a very exact temperature in order for all these other processes to work.
That requires a lot of energy input. About 1500-2000kcal per day.
That’s the **baseline fuel requirement for your body**. Physically moving your *limbs* around (e.g. by exercising) surely factors into it, but just to a very small degree. Accordingly, moving your limbs around *a bit more* does not increase your energetic requirements by a lot. You require far more energy to just *exist*.
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