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Resistant Starch Type-2 Supplementation Does Not Decrease Trimethylamine N-Oxide (TMAO) Plasma Level in Hemodialysis

Julie Ann Kemp1, Henrique Fragoso Dos Santos2, Hugo Emiliano de Jesus2

  • 1Graduate Program in Cardiovascular Sciences, Fluminense Federal University (UFF), Niterói, Rio de Janeiro, Brazil.

Journal of the American Nutrition Association
|May 5, 2022
PubMed
Summary
This summary is machine-generated.

Resistant starch (RS) supplementation did not lower trimethylamine N-oxide (TMAO) levels in hemodialysis patients. This nutritional strategy did not impact gut bacteria or TMAO precursors, suggesting RS is ineffective for reducing uremic toxins in this population.

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Area of Science:

  • Nephrology
  • Gastroenterology
  • Nutritional Science

Background:

  • Gut dysbiosis is a cardiovascular disease risk factor in hemodialysis (HD) patients.
  • Dysbiosis increases uremic toxins like trimethylamine N-oxide (TMAO) from dietary precursors.
  • Nutritional interventions are explored to modulate gut microbiota and reduce TMAO.

Purpose of the Study:

  • To evaluate the effect of amylose-resistant starch (RS) supplementation on plasma TMAO levels in HD patients.
  • To assess RS's impact on gut microbiota composition and TMA-producing bacteria.

Main Methods:

  • A randomized, double-blind, placebo-controlled trial was conducted.
  • HD patients received 16g/d of RS or placebo for 4 weeks.
  • Plasma TMAO, choline, betaine, and fecal microbiome were analyzed.

Main Results:

  • RS supplementation did not significantly reduce plasma TMAO levels.
  • No significant changes were observed in TMAO precursors (choline, betaine).
  • RS did not alter fecal TMA-producing bacterial taxa.

Conclusions:

  • Amylose-resistant starch supplementation is ineffective in reducing TMAO plasma levels in HD patients.
  • RS does not appear to modify TMA-associated gut bacteria or TMAO production pathways.
  • Further research is needed to identify effective nutritional strategies for managing dysbiosis in HD patients.