A recent pilot study challenges the longstanding belief that dietary factors, specifically the intake of d-mannose and urinary acidity, play a significant role in the prevention of recurrent urinary tract infections (RUTIs) among postmenopausal women. Researchers focused on a group of 57 women aged 64 to 75, all with a history of UTIs, to assess whether their dietary habits, including d-mannose consumption and urinary pH levels, could influence their risk of infection.
Participants in the study engaged in daily urine testing using reagent strips over three days to measure urinary pH while simultaneously maintaining detailed food diaries. This allowed researchers to classify the women into two distinct groups based on urinary acidity levels: those with a urine pH predominantly below 6, indicating more acidic urine, and those with a pH above 6, signifying less acidic conditions.
Upon further analysis, researchers discovered that there was no statistically significant difference in d-mannose intake between the two groups, despite d-mannose being renowned as a simple sugar associated with certain fruits and marketed as a supplement for preventing UTIs. The study found that d-mannose levels did not vary meaningfully in relation to urinary pH. In fact, other dietary nutrient intakes showed little distinction tied to urine acidity as well.
While the foods containing d-mannose demonstrated greater overall nutrient density-evidenced by significantly higher amounts of protein, carbohydrates, fats, calcium, iron, and water compared to those without d-mannose-only small differences in fiber, sugar, and sodium intake were recorded. However, these variations were deemed clinically insignificant. Interestingly, the study highlighted that although d-mannose was naturally present in the participants’ diets, the quantities consumed were generally less than what is typically found in commercial dietary supplements.
The authors of the study caution that their findings stem from a small, single-institution investigation, underscoring the need for larger, more rigorous controlled trials to more conclusively determine the influence of d-mannose supplementation and urinary acidity on RUTI recurrence. These preliminary findings suggest that standard dietary patterns among postmenopausal women with a history of UTIs may not offer enough d-mannose to replicate the effects seen with supplementation, nor do they appear sufficient to alter urinary pH in a way that impacts infection risk.
Given the prevalence of urinary tract infections, this research could steer future investigations into alternative preventative measures and dietary recommendations for women at risk. As the conversation surrounding dietary prevention continues, understanding the nuances of how specific nutrients contribute to health remains crucial.
Reference: Chavez JM et al. Comparison of D-mannose in foods with urine pH in post-menopausal women with recurrent urinary tract infections. Urology. 2025.
Original Source: https://www.emjreviews.com/urology/news/study-finds-no-link-between-diet-urinary-ph-and-utis/
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Publish Date: 2025-11-12 20:35:00
