Normal human brain tissue contains 68-80% water(1). Brain cells require a delicate balance between water and various elements to operate and when you lose too much water, that balance is disrupted. Your brain cells lose efficiency(2 – funny and relevant study).
Water keeps the brain from overheating, which can cause cognitive decline and even damage(3). This is why the children who spend half of the time (~ 8h) they are awake performing intellectually stimulating activities at school/kindergarten should be drinking half of their daily water intake right there, throughout the day.
I noticed that kids also tend to go long periods of time without drinking water – busy child life . And when they are thirsty they often choose sweetened drinks. So … their water is our responsibility (they don’t use reminders).
P.S. I appreciate the water breaks the children are encouraged to take (along with their teachers) at the kindergarten that my daughter attends.
With Love and care, Dumi
(1) Reiner Salzer and Heinz W. Siesler (2009) Infrared and Raman Spectroscopic Imaging P 131