All about fruitarianism with a long-term fruitarian, Lena
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The question is not, "Can they reason?" nor, "Can they talk?" but "Can they suffer?”
An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized by the organism, and must be supplied in diet.
The 9 amino acids humans cannot synthesize (F V T W M L I K H):
Animal and plant proteins are made up of about 20 common amino acids.
Synthesis of 6 other amino acids - conditionally essential - can be limited under special conditions (R C G Q P Y): arginine, cysteine, glycine, glutamine, proline, and tyrosine.
Dispensable amino acids can be synthesized in the human body, 5 (A D N E S): alanine, aspartic acid, asparagine, glutamic acid and serine .