Medical Definition of Amino acid, essential

Amino acid, essential: An amino acid that cannot be made by humans and so is essential to the human diet. There are 9 essential amino acids: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

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QUESTION

According to the USDA, there is no difference between a “portion” and a “serving.” See Answer

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Reviewed on 3/29/2021