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 For the study, researchers focused on 140 women with recurrent UTIs
who typically drank fewer than 1.5 liters of fluid (about six
8-ounce glasses) a day. For 12 months, researchers asked half of
these women to continue their usual fluid intake and asked the other
half to drink an additional 1.5 liters of water daily.
Over the year, women who drank more water had an average of 1.7 UTIs,
compared with 3.2 on average for women who didn't add extra water to
their diets, the experiment found.
"The data strongly suggest that hydration status is associated with
UTI risk," said lead study author Dr. Thomas M. Hooton, of the
University of Miami Miller School of Medicine.
"If a woman has recurrent UTI, she should consider her daily fluid
intake and try to increase it to at least two to three liters a
day," Hooton said by email.
Roughly half of women will experience at least one UTI at some
point, researchers note in JAMA Internal Medicine. Once women do
have that first UTI, 27 percent of them will have another one within
six months, and 44 percent to 70 percent will have another UTI
within a year.
Women have long been advised that staying hydrated can help minimize
their risk of these infections. But until now, researchers didn't
have decisive proof that drinking more water can prevent UTIs, the
study authors note.
The women in the current study were generally healthy, but they had
experienced at least three UTIs in the previous year, including at
least one infection that had been confirmed by a clinician with
urine tests. All of the participants also reported drinking less
than 1.5 liters of fluid daily.
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Among women assigned to increase their water intake, participants
drank an average of 1.7 liters more of fluids each day by the end of
the study than they did at the start. Women in the control group
that wasn't asked to boost water consumption didn't experience a
meaningful change in fluid intake over the course of the study.
One limitation of the study is that it was done at a single
location, making it possible that results could be different for
patients elsewhere, the authors note.
Results for these women at high risk for repeat UTIs also might
differ from what would happen with women with a lower risk of UTIs,
noted Dr. Deborah Grady, author of an accompanying editorial and a
professor of medicine at the University of California, San
Francisco.
It's also hard to give women an exact amount of water to consume to
prevent UTIs, Grady said by email.
"The theory is that drinking more water results in more urine
production, which flushes out bacteria in the bladder and prevents
infection," Grady said. "More water usually isn't harmful, but it
can result in the need for frequent urination and having to get up
at night to urinate."
SOURCE: http://bit.ly/2Nhb6xg JAMA Internal Medicine, online October
1, 2018.
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