Study finds cranberries ineffective against urinary infections

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Cranberries – iStock
Cranberries – iStock

Another folk medicine remedy bites the dust. Cranberry capsules didn't prevent or cure urinary infections in nursing home residents in a study challenging persistent unproven claims to the contrary.

Potentially risky infections

The research adds to decades of conflicting evidence on whether cranberries in any form can prevent extremely common bacterial infections, especially in women. Many studies suggesting a benefit were based on weak science, but that hasn't stopped marketers and even some health care providers from recommending cranberry juice or capsules as an inexpensive way to avoid these uncomfortable and potentially risky infections.

Read: Low kJ cranberry juice lowers blood pressure

The new study, published online in the Journal of the American Medical Association, used rigorous methods and the results are convincing, according to a journal editorial. Health care providers who encourage using cranberry products as a prevention method "are doing their patients a disservice", the editorial say

Urinary infections lead to nearly 9 million doctor visits and more than 1 million hospitalisations each year. Men, because of their urinary anatomy, are less vulnerable, while almost half of all US women will develop at least one of these infections in their lifetime. Symptoms can include painful, frequent urination and fatigue. Antibiotics are often used to treat the infections, which usually are not serious but can lead to kidney infections and sometimes dangerous bloodstream infections.

Urinary infections are the most commonly diagnosed infection in nursing home residents, but they often have no obvious symptoms and evidence suggests antibiotics have little effect in these older patients without symptoms, the study authors say.

The study

The research included 147 older women in nursing homes who were randomly assigned to take two cranberry capsules or dummy pills for a year. The number of women with laboratory evidence of infection – bacteria and white blood cells in their urine – varied during the study but averaged about 29 percent overall in both groups.

Read: Uncircumcised boys at higher risk for infection

Ten infections in the cranberry group caused overt symptoms, compared with 12 in the placebo group but that difference wasn't statistically significant. There also were no differences in hospitalisations and deaths between the two groups. The National Institutes of Health helped pay for the research, led by Dr Manisha Juthani-Mehta, a Yale University infectious disease specialist.

The advice

People who think they have a urinary infection should see a doctor for diagnosis and treatment, but avoid cranberry products "in place of proven treatments for infections", according to the National Institutes of Health alternative medicine branch.

The journal editorial says additional research is needed to find effective treatments for nursing home residents and others.

"It is time to move on from cranberries," the editorial says.

Read more:

Antibiotics prevent UTIs

Antibiotics prevent UTIs better than probiotics

Childhood UTI may cause lasting harm to kidneys

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