Hydration has a profound effect on cognitive performance, with even mild dehydration potentially impairing attention, short-term memory, and overall mental clarity. The brain is highly sensitive to fluid loss, and adequate hydration is essential for maintaining optimal neurological function. Dehydration can lead to fatigue, confusion, and slower reaction times, negatively impacting productivity and decision-making. To support cognitive performance, individuals should stay adequately hydrated throughout the day, particularly during physical activities or in hot environments, to ensure both physical and mental capabilities remain sharp.