Mild Dehydration Hard To Notice, But Can Still Impair Mental Performance. A growing body of evidence finds that being just a little dehydrated is tied to a range of subtle effects — from mood changes to muddled thinking.

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Mild Dehydration Hard To Notice, But Can Still Impair Mental Performance. A growing body of evidence finds that being just a little dehydrated is tied to a range of subtle effects — from mood changes to muddled thinking.