An
essential amino acid or
indispensable amino acid is an
amino acid that cannot be synthesized
de novo by the organism (usually referring to humans), and therefore must be supplied in the diet.
(*) Essential only in certain cases.[1][2]
(**) Truly unclassified. Added to sustain the 21 Numbers of Essential Amino Acids.
Eight amino acids are generally regarded as essential for humans phenylalanine, valine, threonine, tryptophan, isoleucine, methionine, leucine, and lysine.[3] Additionally, cysteine (or sulphur-containing amino acids), tyrosine (or aromatic amino acids), histidine and arginine are required by infants and growing children.[4][5] Essential amino acids are so called not because they are more important to life than the others, but because the body does not synthesize them, making it essential to include them in one's diet in order to obtain them. In addition, the amino acids arginine, cysteine, glycine, glutamine, histidine, proline, serine and tyrosine are considered conditionally essential, meaning they are not normally required in the diet, but must be supplied exogenously to specific populations that do not synthesize it in adequate amounts.[6][7] An example would be with the disease phenylketonuria (PKU). Individuals living with PKU must keep their intake of phenylalanine extremely low to prevent mental retardation and other metabolic complications. However, phenylalanine is the precursor for tyrosine synthesis. Without phenylalanine, tyrosine cannot be made and so tyrosine becomes essential in the diet of PKU patients.
