The human brain uses about 20% of the body’s total energy, even though it makes up only about 2% of the body’s weight. This high energy use is because the brain is constantly active, controlling everything from thinking and memory to movement and breathing.
This energy mainly comes from glucose, a type of sugar found in the blood. Because the brain needs so much energy, it is important to eat a healthy diet and get enough rest to keep it working well every day. Shutdown123