<prompt> Essential amino acids are AE -LeucineProlineLysineMethionine  <response>: - essential aminoacid are the one that cannot be synthesised in the body corresponding to the needs. Thus need to be supplied through diet. - they are leucine, isoleucine, lysine, methionine, phenylalanine, threonine, valine, tryptophan and histidine. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:609 p 