Although human brains average only 2% of body weight, our brain uses a fifth of all our blood. Moreover, as humans walk upright, our upper body and brain are more inclined to have insufficient blood and oxygen supply.
That’s why when we sit still long and keep using brain for long time, we may feel dizzy and drowsy caused by lack of blood and oxygen supply to the brain.
We should, therefore, often stretch our body and limbs as indicated by Traditional Chinese Medicine Practitioners.
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