According to Lawrence Armstrong, professor and interim department head in the Department of Kinesiology, proper hydration is an important factor for good health. This applies to everyone, not only endurance athletes.
While symptoms of severe dehydration such as dizziness, increased heart rate and muscle weakness are more commonly known, even mild dehydration (1.5 percent) can cause mood changes and impaired cognitive performance.
Water is essential for proper metabolism, nutrient and waste transport, body temperature regulation and cardiovascular function. Water is lost through urine, sweat, feces and respiratory vapor, and lifestyle choices affect daily hydration. For example, drinking alcoholic beverages or eating foods high in protein or sodium increases the need for water to avoid dehydration.