Just like doing physical activities consumes calories, does a lot of thinking/studying/concentrating on understanding something also consume calories?

I have wondered this for a long time, and nobody I asked seemed to have an answer.

i think so. after a loonng day studying, i feel like i’ve run a marathon

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This is how I feel too - and that’s a great question, OP. Thanks for posting this.

Guess any activity even if it’s just studying does need energy. However, there may be many other factors that come in to consideration, like wether we are having a stressful reading session like exams or simply reading for relaxation.

Check out this article:

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