Does concentrated thought burn calories?
Yes, but not as much as you might hope. under deep anesthesia, your brain uses about six or seven calories an hour, just to keep the brain cells ticking a long.
experiment with rats have shown that just regaining consciousness increases the energy demand of the brain by 50%, even if the body is kept anaesthetized. so even if you spend all day fast asleep, your brain will still burn at least 240calories. the total daily consumption of your brain is 400-500 calories (20% of your total energy requirements) so that's just 160-260 calories for your waking brain activity. And most of this is concerned with the automatic process of controlling your muscles and processing sensory input. there have been some experiments to show that abstract problem solving does raise the brain's metabolic requirements, and the higher your IQ, the more extra energy you can expend in this way. But it's unlikely to amount to more than five calories an hour, either way.
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