Just existing is what burns up most of those 2000 calories , breathing , thinking , and what not all burn calories
Not to mention we are wildly efficient at making the energy molecules for muscle movement , movement has to be efficient as a hunter especially the kind humans are. Ever notice that humans are not particularly fast for “hunter” species? But there’s one thing we can do , and that’s go far. Human muscle systems are so dang efficient we can technically outrun most animals eventually , so just cardio doesn’t burn much energy for us , but adding more body to our body makes a huge change in the daily needs. This is why a 6’5 guy can eat way more and never gain weight compared to a 5ft gal even if she’s way more active then him.
There’s also the aspects of metabolism to consider and your genetics can play a role too
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