chronic dehydration can have significant effects on the brain, including:  impaired cognitive function  fatigue and lethargy  headaches and migraines  mood changes  decreased productivity as for why 75% of people are not hydrated enough, some reasons include:  inadequate water intake  busy lifestyles  lack of awareness  climate and environment  medical conditions  medications  age individual hydration needs vary, but a general recommendation is to drink at least eight 8-ounce glasses of water per day.
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