Question: Can You Drink Too Much Water?
Answer: Your body needs water so you either need to
drink water or other healthy beverages, but your body wasn't designed to get all of the water you need in a whole day in just one sitting. You can drink a large amount of water of the course of a full day, but drinking a gallon or two of water all at once is dangerous, and in fact, can be life-threatening if it leads to a disorder called hyponatremia. Hyponatremia, which is sometimes called
water intoxication, means "low sodium in the blood." It occurs when someone drinks enormous amounts of water and/or loses too much salt from the body in a short time. Drinking too much water overwhelms the kidneys so they can't process and eliminate the water fast enough and the levels of sodium in your blood can get too low. Severe hyponatremia can lead to twitching, seizures and even death.
Hyponatremia doesn't happen when a healthy person spreads his or her water intake over the course of the full day. It's fine to drink one gallon of water over 16 hours, but drinking one gallon of water in a minute or two can be dangerous.
Hyponatremia can happen when marathon runners drink gallons of water and doesn't replace the electrolytes during a race, or when people with certain psychological disorders can't stop themselves from drinking water, or even on a dare. Hyponatremia can also occur in older people and people with certain medical conditions. Someone with hyponatremia needs to see a doctor for diagnosis and treatment.
Source:
American Family Physician. "Management of Hyponatremia." Accessed February 9, 2012. http://www.aafp.org/afp/2004/0515/p2387.html.
