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Metabolically Speaking, Your Brain Is the Most Expensive Organ in Your Whole Body
Your brain is the most expensive organ in your whole body. And as over evolutionary time, as bodies got bigger, brains got bigger. So essentially you can think of your brain as running a budget for your body. Every movement that you take and every new thing that you learn requires energy. Your brain's always doing this very complicated sort of calculus to figure out which movements are worth it.