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Quite a few, but https://www.scientificamerican.com/article/thinking-hard-calories/ https://www.scientificamerican.com/article/thinking-hard-cal... https://ww

• chiefalchemist 3y ago
  From the second link "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. So you can’t Sudoku yourself slim" 5 kcals x 15 hrs = 75 kcals. Actually, this is significant in the sense that if you over kcal by 100 kcals per day that'll add up. 75 is 75% of 100. It looks small but in the context of weight, 75 kcals per day is enough to make a difference.