Our brains are hungry.
“Although the brain represents just 2 per cent of body weight, it consumes about 20 per cent of our energy at rest. Every perception, memory, emotion and idea is metabolically expensive. Thought itself is an energy-hungry act. Weight for weight, our brains are more mitochondrial than neural. This is more than a biological curiosity. It suggests that cognition is inseparable from metabolism – that the mind is not only shaped by networks of neurons but by networks of energy.”