Study suggests cranberry juice not effective against urinary tract infections

Drinking cranberry juice has been recommended to decrease the incidence of urinary tract infections, based on observational studies and a few small clinical trials. However, a new study published in the January 1 issue of Clinical Infectious Diseases, and now available online, suggests otherwise.

College-aged women who tested positive for having a urinary tract infection were assigned to drink eight ounces of cranberry juice or a twice a day for either six months or until a recurrence of a urinary tract infection, whichever happened first. Of the participants who suffered a second urinary tract infection, the cranberry juice drinkers had a recurrence rate of almost 20 percent, while those who drank the placebo suffered only a 14 percent recurrence.

"We assumed that we would observe a 30 percent recurrence rate among the placebo group. It is possible that the placebo juice inadvertently contained the active ingredients that reduce urinary tract infection risk, since both juices contained ," explained study author Betsy Foxman, PhD, of the University of Michigan School of Public Health in Ann Arbor. She added, "Another possibility is that the study protocol kept participants better hydrated, leading them to urinate more frequently, therefore decreasing bacterial growth and reducing urinary tract infection symptoms."


Explore further

Cranberry juice creates energy barrier that keeps bacteria away from cells, study shows

More information: http://cid.oxfordjournals.org/content/52/1/23.full
Citation: Study suggests cranberry juice not effective against urinary tract infections (2010, December 8) retrieved 24 October 2020 from https://medicalxpress.com/news/2010-12-cranberry-juice-effective-urinary-tract.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
 shares

Feedback to editors

User comments