The link between hydration and cognitive performance is well-documented, as adequate fluid intake is essential for optimal brain function. Dehydration can impair concentration, memory, and overall cognitive abilities. Even mild dehydration can negatively affect mood and increase feelings of fatigue or confusion. Staying properly hydrated can enhance alertness, focus, and mental clarity, contributing to improved productivity and decision-making capabilities. To maintain optimal cognitive performance, individuals should prioritize their water intake, especially during physical activities or in hot environments.