The brain requires 20% of energy demands and thinking hard increases demand only by 5%

The brain is only 2% of body weight, but requires 20% of energy demands. Thinking hard only increases energy demand by 5%.

Source: https://x.com/NTFabiano/status/1924110786919833629 Study: https://www.cell.com/trends/cognitive-sciences/abstract/S1364-6613(24)00319-X