Essentially, we lost the ability to make these amino acids because mutant alleles of a handful of synthesis enzymes arose in our ancient ancestors, and individuals with those mutants could survive by eating food that contained the amino acids they can't make. read more
Essentially, we lost the ability to make these amino acids because mutant alleles of a handful of synthesis enzymes arose in our ancient ancestors, and individuals with those mutants could survive by eating food that contained the amino acids they can't make. read more
The other amino acids, known as the essential amino acids (EAA), which the body cannot produce, must be supplied from diet and/or supplements. These include the following: Tryptophan, Lysine, Methionine, Valine, Leucine, Isoleucine, Threonine and Phenylalanine. read more
So no, humans would not develop the capacity to synthesize the essential amino acids if sources of these amino acids became scarce. It is possible (I don't know how likely; probably not very) that some humans already possess the ability to synthesize some of the essential amino acids. read more