Your body contains about 11 gallons of water: Your blood is 85 percent water; your muscles 80 percent; your brain 75 percent and your bones are 25 percent water, which illustrates the importance water plays in your health.

When dehydrated, your brain shrinks in volume. This shrinking is what causes a dehydration headache. Even mild or temporary dehydration can alter your brain function and impact your mood.

In this video, Dr. Greger explains how dehydration affect our mood…

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