Higher Frequency of Fruit Intake Is Associated With a Lower Risk of Constipation in Hemodialysis Patients: A Multicenter Study.

OBJECTIVES: Constipation is a multifactorial gastrointestinal disorder commonly found in hemodialysis (HD) patients. In this multicenter cross-sectional study, we aimed to evaluate the prevalence and factors associated with constipation, including the frequency of dietary fiber intake. METHODS: HD patients from 4 dialysis clinics were invited. Participants answered a questionnaire which included Roma IV criteria to assess constipation status, use of medications, and lifestyle habits. A food frequency questionnaire with 7 response options on the main dietary fiber sources (fruits, vegetables, legumes, whole grains, and seeds) was also applied. Answers were transformed into a score to estimate the weekly intake frequency, and every score point corresponded to one time per week. Demographical and laboratory data were obtained from medical records. Univariate analysis was used to compare participants according to constipation status, and variables with P < .20 were included in the regression analysis model. RESULTS: Three hundred five HD patients were included (male: 51%; age: 52.2 ± 14.7 years old; HD vintage: 46 (19-82) months). Ninety-three participants had constipation (30.5%). Median (interquartile) food frequency questionnaire scores were as follows: fruits: 6 (2-14); vegetables: 6 (3-10); legumes: 3 (1-7); whole grain: 0 (0-1); and seeds: 0 (0-0). In univariate analysis, participants with constipation were significantly older, had lower literacy, higher prevalence of diabetes, and lower total beverage intake. The logistic regression analysis model also included body mass index, wheelchair need, sedentarism, fruits score, and seeds score (all with P < .20 in the univariate analysis). The independent predictors of constipation were diabetes (odds ratio = 1.96, 95% confidence interval 1.07-3.6, P = .03) and fruits intake score (odds ratio = 0.95, 95% confidence interval 0.91-0.99, P = .04). CONCLUSIONS: Almost one-third of the participants had constipation. The independent determinants of constipation were diabetes and lower frequency of fruit intake. Nutritional counseling to increase fiber intake can potentially decrease the prevalence of constipation in this population.