UTI and cranberry

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Kidney
Most urinary tract infections happen in the bladder, and the first step is bacteria sticking to its inner lining; in the test tube, the proanthocyanidins in cranberry block that sticking, and pooled trials found cranberry products cut symptomatic urinary tract infections by about 30%. Filtering and concentrating urine in the kidney is a different stretch. A kidney infection with fever and flank pain needs a doctor; drinking more juice will not fix it.

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Bacteria have to stick first

EVIDENCEMECH 1

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Most urinary tract infections (UTIs) begin when E. coli from the gut sticks to the lining of the bladder and urethra, and only then multiplies and causes inflammation. Urine flow washes away the bacteria that have not attached. The ones that stay hold on with fimbriae — fine hairs on the bacterial surface, also called pili — whose tips recognize sugar molecules on the surface of the lining cells and grip them. Two kinds matter here, P-type and type 1, and each recognizes a different sugar.

So the first step against repeat infections is not necessarily killing bacteria. It is stopping them from sticking. Cranberry and D-mannose both aim at that step.

Red flags — fever, pain when the flank over the kidney is tapped, pregnancy, a first episode in a man — mean medical care, not more of one juice. Fever and flank pain on tapping suggest the infection may have climbed to the kidney; pregnant women and men with a first episode also need a doctor's assessment.

Educational content, not medical advice. See a clinician about your own case.

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UTI and cranberry

Story

Connected to · 1

regulates · 1

Kidney
Most urinary tract infections happen in the bladder, and the first step is bacteria sticking to its inner lining; in the test tube, the proanthocyanidins in cranberry block that sticking, and pooled trials found cranberry products cut symptomatic urinary tract infections by about 30%. Filtering and concentrating urine in the kidney is a different stretch. A kidney infection with fever and flank pain needs a doctor; drinking more juice will not fix it.

Read full story

Stop 1/4

Bacteria have to stick first

EVIDENCEMECH 1

READ THE ORIGINAL

Most urinary tract infections (UTIs) begin when E. coli from the gut sticks to the lining of the bladder and urethra, and only then multiplies and causes inflammation. Urine flow washes away the bacteria that have not attached. The ones that stay hold on with fimbriae — fine hairs on the bacterial surface, also called pili — whose tips recognize sugar molecules on the surface of the lining cells and grip them. Two kinds matter here, P-type and type 1, and each recognizes a different sugar.

So the first step against repeat infections is not necessarily killing bacteria. It is stopping them from sticking. Cranberry and D-mannose both aim at that step.

Red flags — fever, pain when the flank over the kidney is tapped, pregnancy, a first episode in a man — mean medical care, not more of one juice. Fever and flank pain on tapping suggest the infection may have climbed to the kidney; pregnant women and men with a first episode also need a doctor's assessment.

Educational content, not medical advice. See a clinician about your own case.