Effects of Resistant Starch Diet on the Gut Microbiome in Chronic Kidney Disease

The investigators want to learn more about how to help people who have chronic kidney disease (CKD). This study will increase the investigators understanding of how diet affects factors that can slow the progression of kidney disease. The investigators are asking 30 adults and 30 children with stage 3 CKD to be part of this study. Participants will supplement their diet with resistant starch for two weeks. The investigators anticipate that the resistant starch will change the bacteria in the intestines to a more beneficial type of bacteria. The investigators will measure a product of these beneficial bacteria called butyrate. The investigators will also determine changes in the gut bacteria and products of the bacteria in the blood.

Chronic kidney disease (CKD), a progressive decline in kidney function, is a growing health problem: 13% of adults in the US have CKD. Among patients with CKD, the risk of progression to irreversible loss of kidney function (end-stage renal disease, ESRD) is about 1% per year. In addition, adjusted mortality is approximately four times greater among those with CKD compared to those without. For ESRD, apart from dialysis and kidney transplant, no treatment exists. CKD increases urea levels in bodily fluids leading to a dominance of urease-containing bacteria in the gut. Such dysbiosis results in decreased production of the short chain fatty acid, butyrate and decreased health of the colonic epithelial barrier. Consequently, bacterial toxins translocate into the bloodstream, promoting inflammation. Moreover, production of uremic toxins such as indoxyl and p-cresyl sulfates are also increased, resulting in further kidney injury. CKD patients are prescribed a diet low in protein, fiber and symbiotic organisms, which reduces complications like hyperkalemia, but also contributes to the dysbiosis. Re-formulating the CKD diet may improve the clinical management of CKD. The investigators's overall hypothesis is that changes in the microbial diversity, xeno-proteins and xeno-metabolites correlate with CKD progression, and microbiome-directed therapies can be used to slow the disease. In this study, the investigators will determine the tolerability of supplemental resistant starch (RS). Secondary aims are to determine if a diet high in resistant starch changes fecal butyrate concentrations, the make-up of the gut microbiome and the concentrations in the blood of uremic toxins produced by the gut microbiome. This study will help in the design of a future study with the aim of understanding if a high resistant starch diet can slow the progression of chronic kidney disease.