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Nutrición Hospitalaria

versión On-line ISSN 1699-5198versión impresa ISSN 0212-1611

Resumen

CHANG, Liyang et al. Low-protein diet supplemented with inulin lowers protein-bound toxin levels in patients with stage 3b-5 chronic kidney disease: a randomized controlled study. Nutr. Hosp. [online]. 2023, vol.40, n.4, pp.819-828.  Epub 20-Nov-2023. ISSN 1699-5198.  https://dx.doi.org/10.20960/nh.04643.

Objective:

this study aimed to evaluate whether low-salt low-protein diet (LPD) supplemented with 10 g of inulin could lower serum toxin levels in patients with chronic kidney disease (CKD), thereby providing evidence for adjusting dietary prescriptions of inhospital patients and outpatient nutrition consultants.

Methods:

we randomized 54 patients with CKD into two groups. Dietary protein intake compliance was evaluated using a 3-day dietary diary and 24-h urine nitrogen levels. The primary outcomes were indoxyl sulfate (IS) and p-cresyl sulfate (PCS), and secondary outcomes included inflammation marker levels, nutritional status, and renal function. We assessed 89 patients for eligibility, and a total of 45 patients completed the study, including 23 and 22 in the inulin-added and control groups, respectively.

Results:

PCS values decreased in both groups after intervention: inulin-added group, ∆PCS -1.33 (-4.88, -0.63) µg/mL vs. LPD group, -4.7 (-3.78, 3.69) µg/mL (p = 0.058). PCS values reduced from 7.52 to 4.02 µg/mL (p < 0.001) in the inulin-added group (p < 0.001). Moreover, IS decreased from 3.42 (2.53, 6.01) µg/mL to 2.83 (1.67, 4.74) µg/mL after adding inulin; ∆IS was -0.64 (-1.48, 0.00) µg/mL, and a significant difference was observed compared with the control group (p = 0.004). The inflammation index decreased after intervention.

Conclusion:

dietary fiber supplementation may reduce serum IS and PCS levels and modulate their inflammatory status in predialysis CKD patients.

Palabras clave : p-cresyl sulfate; Indoxyl sulfate; Inulin; Dietary fiber; Protein-bound toxin; Chronic kidney disease.

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