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Amino acids are the building blocks of proteins. There are 22 amino acids, 9 of which are called essential because our bodies don't make them and they can only be obtained from the food we eat.
Essential amino acids must be obtained from dietary sources, while nonessential amino acids are those that are synthesized by mammals. You body can not synthesize essential am â¦ ino acids so you need to eat the foods containing them, Of course non-essential amino acids can be synthesized fro precursor molecules.here are 20 naturally occurring amino acids used in protein synthesis alanine, asparagine, aspartic acid, glutamic acid, cysteine, glutamine, glycine, proline, serine, tyrosine, arginine and histidine are non essential in that they can be synthesized from precursors in the diet.