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Updated: May 21, 2026

Real-Time Void Spot Assay
Published on: February 10, 2023
Is caffeine intake associated with urinary incontinence in Japanese adults?
1School of Public Health, Curtin University, Perth, WA, Australia.
Objectives:
To investigate whether caffeine intake is associated with urinary incontinence (UI) among Japanese adults.
Methods:
A total of 683 men and 298 women aged 40 to 75 years were recruited from the community in middle and southern Japan. A validated food frequency questionnaire was administered face-to-face to obtain information on dietary intake and habitual beverage consumption. Urinary incontinence status was ascertained using the International Consultation on Incontinence Questionnaire-Short Form.
Results:
Mean daily caffeine intake was found to be similar between incontinent subjects (men 120 mg, women 94 mg) and others without the condition (men 106 mg, women 103 mg), p=0.33 for men and p=0.44 for women. The slight increases in risk of UI at the highest level of caffeine intake were not significant after adjusting for confounding factors. The adjusted odds ratios (95% confidence interval) were 1.36 (0.65 to 2.88) and 1.12 (0.57 to 2.22) for men and women, respectively.
Conclusions:
No association was evident between caffeine intake and UI in middle-aged and older Japanese adults. Further studies are required to confirm the effect of caffeine in the prevention of UI.
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