Through sweating, urinating, exhaling and bowel movements, most adults lose about 9-10 cups of fluid a day. And even a minor dehydration can cause serious problems, like impaired concentration, irritability, headaches and fatigue.
So, drinking more water everyday will help you think clearly. Also remember, research has repeatedly shown that staying hydrated is necessary for the human brain, which is 85 percent water, to function at optimal levels.
source: ririanproject.com
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