. The required amounts of the nine essential amino acids must be provided in the diet, but because cystine can replace approximately 30% of the requirement for methionine, and tyrosine about 50% of the requirement for phenylalanine, these amino acids must also be considered.
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Protein and Amino Acid requirementsion based on reasonable biological principles.
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THE REQUIREMENT FOR AMINO ACIDS
In determining the requirement for protein, the subcommittee first considered requirements for the essential amino acids<span>. The required amounts of the nine essential amino acids must be provided in the diet, but because cystine can replace approximately 30% of the requirement for methionine, and tyrosine about 50% of the requirement for phenylalanine, these amino acids must also be considered. The essential amino acid requirements of infants, children, men, and women were studied extensively from 1950 to 1970. Except for infants, where the criterion was growth and nitrogen acc Summary
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