. The brain's appetite for energy is enormous, ie

"...The brain represents only about 2% of most people's body weight, yet it accounts for about 20% of the body's total energy usage..."

John Medina, 2009

. The human brain cannot simultaneously activate more than 2% of its neurons at any one time as the glucose supply cannot handle a greater usage. Also it generates much toxic waste. It needs much oxygen-soaked blood.

. As the brain is around 80% water, we need to keep water levels up. Remember that most unprocessed foods are around 70% water. On of the best ways to test if your body has an adequate water level is the colour of your urine, ie the darker the colour, the greater the need for a drink of water

. Need to keep glucose (energy) & water levels up to ensure that brain is functioning OK. Takes 15 minutes for glucose to go from stomach to brain

. Of the 3 main human requirements (food, drink and fresh air), humans can only lie for a couple of minutes without air; around a week without water; nearly a month without food.

. One of the challenges in change management is to get beyond these limbic response to the cognitive part of the brain so that a more rational response happens. But this requires more energy usage and the brain wants to save energy. Thus the brain would prefer to save energy and stay with limbic response and this helps explain the resistance to change.


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