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How Dehydration Affects Your Brain Function

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  • 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
  • Drinking 16 ounces of water can raise your metabolic rate by as much as 30 percent; a 2 percent level of dehydration has been shown to cause a 10 percent decrease in athletic performance
  • 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
  • Dehydration-induced effects such as sleepiness, fatigue, moodiness and confusion are easily reversed within 20 minutes of drinking some water. Cold water absorbs 20 percent faster than tepid water, so to increase the speed of recuperation, drink chilled water

By Dr. Mercola

Water makes up at least two-thirds of the human body and plays an important role in your normal functions. Subsequently, dehydration can lead to a number of other ailments, from migraines and constipation to kidney stones. It can also take a toll on your brain health, affecting your mood and overall brain function. For example, when you're dehydrated, you're more prone to irritability, anxiety and fatigue.


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