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Amino Acids. 2016 Aug;48(8):1785-91. doi: 10.1007/s00726-016-2188-1. Epub 2016 Feb 13.

The role of dietary creatine.

Author information

1
Department of Biochemistry, Memorial University of Newfoundland, St. John's, NL, A1B 3X9, Canada.
2
Department of Biochemistry, Memorial University of Newfoundland, St. John's, NL, A1B 3X9, Canada. jbrosnan@mun.ca.

Abstract

The daily requirement of a 70-kg male for creatine is about 2 g; up to half of this may be obtained from a typical omnivorous diet, with the remainder being synthesized in the body Creatine is a carninutrient, which means that it is only available to adults via animal foodstuffs, principally skeletal muscle, or via supplements. Infants receive creatine in mother's milk or in milk-based formulas. Vegans and infants fed on soy-based formulas receive no dietary creatine. Plasma and muscle creatine levels are usually somewhat lower in vegetarians than in omnivores. Human intake of creatine was probably much higher in Paleolithic times than today; some groups with extreme diets, such as Greenland and Alaskan Inuit, ingest much more than is currently typical. Creatine is synthesized from three amino acids: arginine, glycine and methionine (as S-adenosylmethionine). Humans can synthesize sufficient creatine for normal function unless they have an inborn error in a creatine-synthetic enzyme or a problem with the supply of substrate amino acids. Carnivorous animals, such as lions and wolves, ingest much larger amounts of creatine than humans would. The gastrointestinal tract and the liver are exposed to dietary creatine in higher concentrations before it is assimilated by other tissues. In this regard, our observations that creatine supplementation can prevent hepatic steatosis (Deminice et al. J Nutr 141:1799-1804, 2011) in a rodent model may be a function of the route of dietary assimilation. Creatine supplementation has also been reported to improve the intestinal barrier function of the rodent suffering from inflammatory bowel disease.

KEYWORDS:

Creatine kinase; Creatine synthesis; Intestinal barrier function; Paleolithic diet; Steatohepatitis

PMID:
26874700
DOI:
10.1007/s00726-016-2188-1
[Indexed for MEDLINE]

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