14. The Cost of Brain Activity
All this background brain activity comes at a significant metabolic cost. The brain’s “dark energy” requires a constant supply of oxygen and glucose, making it the most energy-hungry organ in the body. The circulatory system works tirelessly to deliver these vital resources, ensuring that even at rest, the brain’s needs are met. This energetic investment highlights just how essential ongoing neural activity is for our survival, cognition, and overall well-being.