Intestinal Microbial Contribution to Metabolic Leucine Input in Adult Men

New estimates of the indispensable amino acid requirements of adult humans are much higher than previously thought and questions the adequacy of cereal-based diets of low protein quality. However, dietary amino acid requirements may be supplemented by contributions from the intestinal microbiota. Th...

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Veröffentlicht in:The Journal of nutrition 2008-11, Vol.138 (11), p.2217-2221
Hauptverfasser: Raj, Tony, Dileep, Uma, Vaz, Mario, Fuller, Malcolm F, Kurpad, Anura V
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container_issue 11
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container_title The Journal of nutrition
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creator Raj, Tony
Dileep, Uma
Vaz, Mario
Fuller, Malcolm F
Kurpad, Anura V
description New estimates of the indispensable amino acid requirements of adult humans are much higher than previously thought and questions the adequacy of cereal-based diets of low protein quality. However, dietary amino acid requirements may be supplemented by contributions from the intestinal microbiota. This study measured the contribution of intestinal microbes to leucine input in healthy adult men. Fourteen adult men were studied during each of 2 11-d periods (before and after intestinal antimicrobial treatment), in which leucine was supplied at 1.25 times the estimated average requirement (EAR) (d 1-7) and at 2.5 times the EAR (d 8-11) providing an L-amino acid diet. We estimated fasting- and fed-state leucine oxidation on d 7 and d 11 using a ¹³C-leucine tracer infusion. The microbial contribution to body leucine input was calculated from the relationship of leucine oxidation to leucine intake and the reduction in leucine oxidation after antimicrobial treatment. Antimicrobial treatment did not affect the slope of the relationship of leucine oxidation to leucine intake. Mean and fed-state leucine oxidation declined by ~13 and 20%, respectively (both P < 0.05) after antimicrobial treatment with the 1.25 EAR diet, but not with the 2.5 EAR diet. The contribution of the intestinal microbiota to body leucine input was estimated to be between 19 and 22% at the 1.25 EAR diet. The contribution of the intestinal microbiota to body amino acid homeostasis may be significant at maintenance intakes, but its long-term nutritional importance remains to be determined.
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Feeding behavior</topic><topic>Fundamental and applied biological sciences. 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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection
subjects Adult
adults
amino acid metabolism
amino acid requirements
Anti-Bacterial Agents - pharmacology
antimicrobial properties
Bacteria - drug effects
Bacteria - metabolism
Biological and medical sciences
cereal-based diets
Ciprofloxacin - pharmacology
dietary protein
Feeding. Feeding behavior
Fundamental and applied biological sciences. Psychology
homeostasis
Humans
intestinal microorganisms
Intestines - microbiology
leucine
Leucine - biosynthesis
Male
men
nutrition physiology
oxidation
protein intake
Vertebrates: anatomy and physiology, studies on body, several organs or systems
title Intestinal Microbial Contribution to Metabolic Leucine Input in Adult Men
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