In young children, adolescents and in older (40+) athletes, we find natural hydration mechanisms (thirst triggers, taste) and heat dissipation functions (skin blood flow and sweat rates) are underdeveloped or diminished, making proper hydration strategies a bigger concern. In these populations cognitive monitoring is generally required.
The other side of the equation starts with "a little bit of knowledge can be dangerous"
This is never more true than in the world of nutrition, and hydration is no exception. In recent years there has been so much attention focused on "water" intake (especially with the increased marketing efforts from makers of bottled water). The average, lightly active person has no trouble replacing the approximate loss of two to three liters of fluids used daily, and it's often done without drinking one glass of pure water. In spite of this, the average person is exposed to a considerable amount of information/advertising that tells them they require considerably more.
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