How Much Energy Does It Take To Think?

The human brain uses 20% of the body's energy while making up only 2% of its weight. Research shows focused mental tasks consume just 5% more energy than the brain at rest. Most brain function is dedicated to maintenance, prediction, and regulating bodily systems. This efficiency likely evolved to conserve energy in resource-scarce environments. Studying neural metabolism offers insights into brain limitations, capabilities, and the evolution of our cognitive abilities.