Tyrosine is classified as conditionally essential when dietary intake of phenylalanine is insufficient or the body cannot normally metabolise phenylalanine.
In terms of structure, phenylalanine is connected to tyrosine and epinephrine (adrenaline). phenylketonuria (PKU) is typically treated by altering the diet to exclude phenylalanine-rich foods. Several foods, such as chicken, fish, cottage cheese, lentils, peanuts, and sesame seeds, contain the amino acid phenylalanine.
Phenylalanine is a necessary nutrient, but some people are born with phenylketonuria, a genetic condition that prevents them from metabolising phenylalanine. If it is left untreated, phenylalanine builds up in the body and is converted to phenyl-pyruvate.
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