Hydration research focuses on studying the effects of water intake on human health and performance. This includes investigating optimal hydration levels for various activities, such as exercise, cognitive function, and overall well-being. Research in hydration also examines the impact of dehydration on physical and mental performance, as well as the importance of staying adequately hydrated for overall health and wellness. This area of research is important for understanding how hydration plays a critical role in maintaining physiological functions and optimizing human performance.