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Challenging the popular notion that we should drink eight glasses of water a day for good health, researchers have found that drinking too much water can put people in danger of water intoxication.
Researchers from the Monash University in Victoria, Australia, have found a mechanism that regulates fluid intake in the human body and stops us from over-drinking.
The findings showed that excess of water in the body can cause water intoxication or hyponatremia, a condition that occurs when the vital levels of sodium in the blood become abnormally low.
The condition can potentially give rise to symptoms ranging from lethargy and nausea to convulsions and coma.
The study revealed that a 'swallowing inhibition' is activated by the brain after excess liquid is consumed, helping maintain tightly calibrated volumes of water in the body.
"If we just do what our body demands us to we'll probably get it right, just drink according to thirst rather than an elaborate schedule," said Michael Farrell, Associate Professor at the Monash University.
For the study, the team asked participants to rate the amount of effort required to swallow water under two conditions; first, following exercise when they were thirsty and second, for when they were persuaded to drink an excess amount of water.
The results showed a three-fold increase in an effort after over-drinking.
Further, the team used functional magnetic resonance imaging (fMRI) and found that the right prefrontal areas of the brain were much more active when participants were trying to swallow water with much effort.
"We found effort-full swallowing after drinking excess water which meant they were having to overcome some sort of resistance, as the swallowing reflex becomes inhibited once enough water has been drunk," Farrell said.
The study was published online in the Proceedings of the National Academy of Sciences.