there are tons, but here's one: https://www.semanticscholar.org/paper/Voluntary-Dehydration-and-Cognitive-Performance-in-D%27Anci-Mahoney/92f85966741b9107e6a73

there are tons, but here's one: https://www.semanticscholar.org/paper/Voluntary-Dehydration-and-Cognitive-Performance-in-D%27Anci-Mahoney/92f85966741b9107e6a73153e9d61cba950cefb5?p2df https://www.semanticscholar.org/paper/Voluntary-Dehydration-... many people are actually not drinking enough water.