Hydration and its Impact on Brain Function
Humans can survive without food for several weeks but without water, life would end in three to five days. Our brain is comprised of approximately 75% water. That fact, alone, tells us how critical hydration is to the brain and body.
While we often think of food and nutrients as critical to life (they are), water is even more so. The average person can live only three to five days without water. Most can survive about three weeks without food.