Urinary tract infections are extremely common and affect millions of people every year. These infections can happen in the bladder, urethra, or other parts of the urinary system.
Women are affected much more often than men because bacteria can enter the urinary tract more easily.
Many people who develop a urinary tract infection experience burning pain during urination, frequent urges to urinate, lower stomach discomfort, and tiredness. In more serious cases, the infection may spread to the kidneys and become dangerous.
Most urinary tract infections are caused by harmful forms of E. coli bacteria. While many strains of E. coli normally live harmlessly in the digestive system, some types can trigger infection when they enter the urinary tract.
Doctors usually treat UTIs with antibiotics, and one commonly prescribed medication is fosfomycin. This antibiotic is especially useful because it can still work against some bacteria that resist other antibiotics.
However, antibiotic resistance is becoming one of the biggest medical challenges in the world. Over time, bacteria can evolve and develop mutations that help them survive antibiotics. This means treatments become less effective and infections become harder to cure.
Scientists are now urgently searching for new ways to improve antibiotic treatments without always needing to invent entirely new drugs.
A new study from researchers in Montreal, Canada, suggests cranberry juice may help antibiotics work more effectively against urinary tract bacteria.
The research was published in the journal Applied and Environmental Microbiology.
The scientists tested cranberry juice on laboratory-grown strains of E. coli that commonly cause urinary tract infections. They examined how the juice interacted with fosfomycin, the antibiotic frequently used to treat these infections.
The results were encouraging. In 72 percent of the bacterial strains tested, cranberry juice strengthened the activity of the antibiotic and reduced the development of mutations linked to antibiotic resistance.
Lead researcher Eric Déziel explained that the study only examined bacteria under laboratory conditions. The research does not yet prove that drinking cranberry juice will directly improve treatment in humans.
Researchers still need to determine whether the active compounds from cranberry juice can travel through the body and reach the urinary tract in useful amounts after people drink the juice.
Still, the findings are important because cranberries have long been associated with urinary tract health.
For many years, people believed cranberry juice worked mainly because it was acidic. Later research suggested that special compounds inside cranberries may prevent bacteria from sticking to the cells lining the urinary tract.
If bacteria cannot attach properly, they may struggle to grow and spread.
The new study explored another possible mechanism. Scientists discovered that fosfomycin enters bacterial cells through channels normally used by bacteria to absorb sugars.
Something inside cranberry juice appears to stimulate the bacteria to increase sugar uptake through one of these channels. Because fosfomycin uses the same pathway, the bacteria may accidentally absorb more antibiotic at the same time.
Researchers are still trying to identify exactly which substances inside cranberry juice produce this effect.
The study also found that cranberry juice appeared to suppress some of the mutations that help bacteria become resistant to antibiotics. This could become very important in the future because antibiotic resistance continues to rise worldwide.
The research builds on earlier work from Déziel’s laboratory involving cranberry extracts. Those studies found that concentrated cranberry compounds could strengthen antibiotics against resistant bacteria.
However, scientists wanted to know whether regular cranberry juice might provide similar benefits because juice is what people commonly consume in everyday life.
The findings have generated interest because they support a growing scientific strategy called antibiotic adjuvant therapy. Instead of replacing antibiotics, researchers are searching for natural compounds that can help existing antibiotics work better.
This approach may become valuable because creating entirely new antibiotics is slow, expensive, and increasingly difficult.
The researchers strongly emphasized that people should not try to replace medical treatment with cranberry juice alone. UTIs can become serious if left untreated, especially if the infection spreads to the kidneys.
However, future research may eventually show that cranberry compounds could support antibiotic treatment in safe and effective ways.
Researchers also noted that natural products may contain many different chemicals that interact with bacteria in unexpected ways. Scientists are now exploring plants, foods, and natural substances more closely as possible tools against antibiotic-resistant infections.
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Source: Institut National de la Recherche Scientifique.
