how much of our energy each day is dedicated to the brain's function?

Question

Please tell me.. i really don't know about it.

Answer 1

The brain makes up 2% of a person's weight. Despite this, even at rest, the brain consumes 20% of the body's energy. The brain consumes energy at 10 times the rate of the rest of the body per gram of tissue. The average power consumption of a typical adult is 100 Watts and the brain consumes 20% of this making the power of the brain 20 W.

Based on a 2400 calorie diet (Adapted from Yang)

2400 "food calorie" = 2400 kcal

2400 kcal / 24 hr = 100 kcal/hr = 27.8 cal/sec = 116.38 J/s = 116 W

20% x 116 W = 23.3 W

Glucose is the main energy source for the brain. As the size and complexity of the brain increases, energy requirements increase.

The human brain is one of the most energy hungry organs in the body thereby increasing its vulnerability. If the energy supply is cut off for 10 minutes, there is permanent brain damage. There is no other organ nearly as sensitive to changes in its energy supply.