A Randomized Double-Blind Cross-Over Trial to Study the Effects of Resistant Starch Prebiotic in Chronic Kidney Disease (ReSPECKD)

Abstract

Background: Chronic kidney disease (CKD) is associated with a reduced quality of life and an increased risk of kidney failure, cardiovascular events, and all-cause mortality. Accumulation of nitrogen-based uremic toxins leads to worsening of symptoms in individuals with CKD. Many uremic toxins, such as indoxyl and p-cresol sulphate, are produced exclusively by the gut microbiome through the proteolytic digestion of aromatic amino acids. Strategies to reduce the production of these toxins by the gut microbiome in individuals with CKD may lessen symptom burden and delay the onset of dialysis. One such strategy is to change the overall metabolism of the gut microbiome so that less uremic toxins are produced. This can be accomplished by manipulating the energy source available to the microbiome. Fermentable carbohydrates which reach the gut microbiome, like resistant starch (RS), have been shown to inhibit or reduce bacterial amino acid metabolism. This study aims to investigate the the effects of resistant potato starch (RPS) as a prebiotic in individuals with CKD before the onset of dialysis. Methods: This is a double blind, randomized two-period crossover trial. 36 eligible participants will consent to follow a 26-week study regimen. Participants will receive 2 sachets per day containing either 15 grams of RPS (MSPrebiotic, resistant potato starch treatment) or 15 grams corn starch (Amioca TF, digestible starch control). Changes in blood uremic toxins will be investigated as the primary outcome. Secondary outcomes include the effect of RPS consumption on symptoms, quality of life and the abundance, diversity and functionality of the gut microbiome.Discussion: This pilot randomized trial will provide further insight into whether the consumption of RPS as a prebiotic will reduce uremic toxins and symptoms in individuals who have CKD. Trial registration: NCT04961164