Does Thinking Really Hard Burn More Calories? https://www.scientificamerican.com/ar... "Unlike physical exercise, mental workouts probably do not demand significantly more energy than usual. Believing we have drained our brains, however, may be enough to induce weariness."
Human Brain Loses Billions of Neurons in New Analysis http://www.livescience.com/18749-huma... "The whole human race just got a little dumber: A new analysis of the number of neurons, those brain cells that transmit thoughts, in the human brain has come back with a staggeringly lower number than thought -- 14 billion brain cells fewer, about the size of the baboon brain."
Brain cells mobilize sugar in response to increased activity https://medicalxpress.com/news/2017-0... "New research is providing insights into why the brain is so reliant on sugar to function. In a study published Jan. 19 in Neuron, a research team led by Weill Cornell Medicine investigators discovered that brain cells recruit a specific sugar, glucose, to fuel the transmission of electrical signals that enable people to think, breathe and walk."
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