As the popularity of soft drinks, energy drinks, sugary juice-flavored drinks, and coffee rises, children are often chronically dehydrated without knowing it. A growing child needs more water because a growing body needs plenty of water. Many children are already dehydrated because of this situation. Their cells are constantly dividing and getting bigger. That requires a lot of water. Many children today quench their thirst with other non-water sources. Without the water they need, histamine is released. Histamine regulates water in the body.
Unfortunately, excessive histamine also causes allergies and asthma by closing the bronchioles so that water is not lost through exhalation. It saves water for the body but makes breathing very difficult. If a child does not learn to recognize thirst signals and to drink water very early on, they may have an extremely hard time staying healthy.
Another reason kids need water is because their brain is still developing. In order to have a developed attention span and emotional coping skills, water is necessary. Many teenagers today seem to have lost their energy and ability to focus in school. A hydrated child could have an abundance of energy and focus throughout their entire day, setting a behavioral pattern for life
Reference: “Water for Health, for Healing, for Life” by F. Batmanghelidj, M.D.