eli5: Why do we always get strong urge to be lazy if its better for the brain to be active

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I mean its so much better for the brain to be active working doing useful things stimulating your brain or working out, we all have a reward system and everytime we finish a task we feel a sense of accomplishment but everytime you should be doing something that you know will feel good in the end you just get this urge of doing nothing today and just relaxing,
shouldnt our brain be chasing this sense of accomplishment? Where does this feeling come from

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Anonymous 0 Comments

Nature doesn’t care what’s better for us. It cares about us reproducing. That is essentially the only thing that drives evolution. Laziness is a way to conserve energy. When food wasn’t plentiful, conserving energy was much more important than it is today (at least in societies that have a surplus of food). And in the eyes of evolution, starving to death at a young age is much worse than the potential negative effects of laziness on the brain. You can still have offspring if your brain is less stimulated.

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