Berries and Urinary Tract Infections UTI's
Dr. I. Ofek of Tel Aviv University in Israel other tested fruit and
found that blueberries, which come from the same genus as cranberries,
were the only other fruit that had the same affect on Urinary Tract
(Article below was written by Mary Cheatham, Extension graduate assistant Prudue University)
Cranberries Good For Thanksgiving And Possibly For Fighting Infections
Many people used to, and some still do, advocate drinking cranberry
juice to increase the acidity (lower the pH) of the urine and prevent
urinary tract infections. Studies have been contradictory about the
acidification of urine by drinking cranberry juice. Some studies have
not shown acidification of urine even with amounts of 2000 milliliters
per day of cranberry juice (that's more than 2 quarts per day!).
Research has shown a possible new mechanism of action for cranberry
juice to reduce urinary tract infections. Data has shown cranberry
juice can inhibit the bacterial adherence to mucosal surfaces and thus
decrease the incidence of urinary tract infections.
A study was done to test the effects of cranberry juice in older
women. This population was chosen because they have been found to have
a lot of bacteriuria (bacteria in the urine). Bacteriuria was defined
as organisms numbering more than or equal to 1 million per milliliter.
This study was done in Boston Massachusetts by Brigham and Women's
Hospital, Harvard Medical School and the Hebrew Rehabilitation Center
One hundred fifty three women of an average age of 78.5 years were
randomly divided into two groups. One group consumed the cranberry
juice beverage and the other group consumed a cranberry flavored
placebo drink. Each person was to consume 300 ml (about 10 oz.) per day
of the cranberry beverage. This was a double- blind study with neither
the patient nor the people distributing the beverage or collecting
urine samples knowing who was getting the real cranberry juice.
A smaller percentage of urine samples had bacteria in the cranberry
juice beverage group than the group drinking the placebo. Bacteriuria
in the cranberry juice group was only 42% as likely to occur as in the
One possible confounding factor in this study was that the group
drinking the cranberry juice beverage had a lower previous history of
urinary tract infections. This was factored out in the statistical analysis and addressed in the paper.
Source Reduction of Bacteriuria and Pyuria After Ingestion of Cranberry
Juice, Avorn,J., Monane,M., Gurwitz,J.H., Glynn,R.J., Choodnovskiy, I.,
and Lipsitz,L.A., Journal of the American Medical Association, March 9,
1994 - Vol 271, No. 10, 751-754.