8 glasses of water per day? Rubbish!

I’m glad to see that final­ly, some sci­en­tif­ic inves­ti­ga­tion is being done on this old canard. And it turns out you don’t need to drink litres of water per day at all:

Accord­ing to Heinz Valtin, a retired pro­fes­sor of phys­i­ol­o­gy from Dart­mouth Med­ical School who spe­cial­ized in kid­ney research and spent 45 years study­ing the bio­log­i­cal sys­tem that keeps the water in our bod­ies in bal­ance, the answer is no.

The Nation­al Acad­e­my of Sciences’s Insti­tute of Med­i­cine also researched this in 2004:

Its pan­el on “dietary pref­er­ence intakes for elec­trolytes and water” not­ed that women who appear ade­quate­ly hydrat­ed con­sume about 91 ounces (2.7 liters) of water a day and men about 125 ounces (3.7 liters). These seem­ing­ly large quan­ti­ties come from a vari­ety of sources—including cof­fee, tea, milk, soda, juice, fruits, veg­eta­bles and oth­er foods. Instead of rec­om­mend­ing how much extra water a per­son should drink to main­tain health, the pan­el sim­ply con­clud­ed that “the vast major­i­ty of healthy peo­ple ade­quate­ly meet their dai­ly hydra­tion needs by let­ting thirst be their guide.”

So there you go. Your body has a per­fect­ly good way of telling you it needs a bit of top­ping up. Short of an ill­ness that requires you to over-hydrate, or weath­er requir­ing the same, drink when you’re thirsty and stop wor­ry­ing.

Via Sci­en­tif­ic Amer­i­can

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