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Women are generally advised to drink more water to prevent recurrent urinary tract infections, or U.T.I.s, but so far, little evidence has proved its effectiveness. At present, a randomized trial has shown that women who drink more water actually contract fewer infections.
The researchers studied 140 women with urinary recurrences who usually drank less than one and a half liters of water a day and averaged 3.3 episodes of cystitis the previous year.
Scientists randomly assigned them either to continue their usual consumption of water and other liquids, or to drink an extra quarter of a liter a day. The study is in JAMA Internal Medicine.
The women in the control group had an average of 3.2 urinary tract infections over a year, while those who drank more water averaged 1.7. There was no serious adverse effect.
"We do not know what is the proportion of recurrent infections among people who drink at low volume," said lead author, Dr. Thomas M. Hooton, a professor of clinical medicine at the University of Toronto. University of Miami. "But we can now say that there is data that shows that if you want to reduce your U.T.I. risk, drink more fluids. "
The study was funded by Danone Research, which markets the Evian water used in the study. But Dr. Hooton said, "There is no reason to think that old tap water would not be as effective."
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