I sit down for a physics textbook, 20 minutes of reading pass, and I’m exhausted. I yawn, I think of blue almonds, I look out the window. Now we had a series of different tests and the more the worse. I guess I’m just stupid? But I guess I’m not, because I learn well and when I learn something, I remember it well, so I don’t know what it is about …
In a way, the brain works like an engine – it constantly consumes fuel, which it then replenishes itself, making it from substrates supplied by the blood. If we think hard about something, the brain runs at high speed and burns out that “fuel” much faster than normal. We feel this as mental fatigue. The speed of “fuel consumption” depends on the brain’s efficiency (e.g., the maturity of nerve cells – children’s brains tire faster) and on the difficulty of a mental task – the more concentration it requires, the more new and complex it is, it forces the user to engage more cognitive resources – the more we get tired faster.
This is one of the reasons why people usually focus better in the morning when refreshed than in the evening. And therefore mental work can be as exhausting, and sometimes even more, than manual labor.
The brain makes up only 1% of the body weight, but uses about 20% of the oxygen absorbed by the body. For the brain to work efficiently, it must be properly “nourished” – have a sufficient portion of magnesium, potassium, sodium and carbohydrates. You should sleep for the right amount of hours, and exercise your brain regularly …
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