Drink eight glasses of water a day for good health

A new study suggesting that drinking too much water can put people in risk of water intoxication.

Researchers say that just as our body tells us when to drink, there is a mechanism that regulates fluid intake and tells us when to stop i.e. stops us from over-drinking. Results of the study by researchers from Monash University in Victoria, Australia indicate that excess of water in the body can cause water intoxication or hyponatremia — a condition that occurs when 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 Monash University.

Researchers asked participants of the study to rate the amount of effort required to swallow water under two conditions: following exercise when they were thirsty and later after they were persuaded to drink an excess amount of water. The results showed a three-fold increase in 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 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.