Special nutritional needs of chronic kidney disease and end-stage renal disease patients: Rationale for the use of plant-based diets

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

As kidney disease progresses, there is a rise in parathyroid hormone (PTH) and fibroblast growth factor- 23 (FGF23) to increase urinary phosphate excretion and maintain normal serum phosphate levels until late in the course of kidney disease. At that time, this compensation is inadequate and hyperphosphatemia develops, and this is associated with arterial calcification and mortality in patients with kidney disease. In addition, chronic and persistent elevation in PTH and FGF23 can lead to adverse consequences such as left ventricular hypertrophy and bone loss. Thus, intervening by decreasing intestinal phosphorus absorption may prevent the rise in phosphate, PTH, and FGF23 levels that are observed with progressive kidney disease, leading to beneficial effects over time. One approach to decreasing intestinal phosphorus absorption is to ingest foods with lower bioavailable phosphorus. Grain-based (vegetarian) sources of protein contain phosphorus bound to phytate. Humans lack the enzyme phytase, and thus hydrolysis of phytate to release phosphate is reduced. In a rat model of chronic kidney disease (CKD), a grain-based versus synthetic casein-based protein diet of equivalent total phosphate and protein content led to reduced urinary phosphate excretion, lower PTH and FGF23 levels, and slower progression of kidney disease. In humans with stage 3b to 4 chronic kidney disease, a small cross-over trial found reduced urinary phosphate excretion with 100% vegetarian versus 100% meat-based diet consumed for one week. In a four-week study, a 70% plant-based diet similarly decreased the urinary phosphate excretion in patients with advanced kidney disease. Thus, grain/vegetarian-based diets contain less bioavailable phosphate and can provide an adequate source of protein yet decrease intestinal phosphate absorption. Long-term studies are needed to fully assess safety and efficacy.

Original languageEnglish (US)
Title of host publicationDietary Phosphorus
Subtitle of host publicationHealth, Nutrition, and Regulatory Aspects
PublisherCRC Press
Pages235-246
Number of pages12
ISBN (Electronic)9781498706971
ISBN (Print)9781498706964
DOIs
StatePublished - Jan 1 2017

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Chronic Renal Insufficiency
Chronic Kidney Failure
Phosphates
Diet
Kidney Diseases
Parathyroid Hormone
Phosphorus
Intestinal Absorption
Phytic Acid
Proteins
Vegetarian Diet
6-Phytase
Hyperphosphatemia
Left Ventricular Hypertrophy
Caseins
Cross-Over Studies
Meat
Hydrolysis
Safety
Bone and Bones

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Special nutritional needs of chronic kidney disease and end-stage renal disease patients : Rationale for the use of plant-based diets. / Moorthi, Ranjani; Moe, Sharon.

Dietary Phosphorus: Health, Nutrition, and Regulatory Aspects. CRC Press, 2017. p. 235-246.

Research output: Chapter in Book/Report/Conference proceedingChapter

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