05-24-2016, 07:34 PM
(05-24-2016, 07:34 AM)Odin Wrote:(05-24-2016, 12:11 AM)Kinser79 Wrote: Actually mental work is even worse. Productivity starts a rapid decline after 6 hours even with breaks. That would be most white collar work. Physical jobs take longer to reach the status of negative productivity because the muscles are less demanding of oxygen, and fuel than the brain.
IIRC about 1/4 of our daily calories (so, about 500 to 800 calories a day) goes to fueling our brains. I remember reading on a book on human evolution that our brain's blood circulation is specially adapted to getting rid of all the heat generated by the brain's metabolism, an adaptation not found in chimps and gorillas.
No wonder I'm tired when I get home from work.