Your brain is constantly monitoring and fine-tuning what is going on in your body. Consciousness emerges from the frontal lobes of your brain. The right and left hemispheres of your brain are connected by 50 million neurons. The consistency of a brain is very much like warm butter. The fuel used to keep you moving and functioning is glucose, which comes from the carbohydrates you eat. Your brain is 85 percent water. Getting dehydrated can have bad effects on your brain, including a decrease in your ability to concentrate. Be sure to drink 8 glasses of water a day to stay healthy and alert.