Which nutrient is crucial for hydration and temperature regulation during exercise?

Water is essential for hydration and plays a critical role in temperature regulation during exercise. When the body engages in physical activity, it generates heat, causing an increase in body temperature. Water helps to dissipate that heat through processes like sweating. As sweat evaporates from the skin's surface, it cools the body down, thereby maintaining a stable internal temperature.

Furthermore, water is vital for various physiological processes, including nutrient transportation, muscle function, and joint lubrication. Adequate hydration is necessary to ensure optimal performance and prevent overheating, dehydration, and potential heat-related illnesses during exercise. The body's reliance on water for these functions underscores its importance compared to other nutrients such as protein, minerals, or fats, which have different primary roles in nutrition and energy metabolism.