This document discusses essential amino acids and their functions. It lists the essential amino acids as histidine, isoleucine, leucine, lysine, methionine, phenylalanine, and threonine. Each amino acid is then discussed in 1-2 sentences on its role in processes like signal transmission, hunger regulation, collagen formation, and mental health. The document also notes that meat, eggs, milk, fish and cheese contain complete proteins while vegetables, grains, seeds and nuts contain incomplete proteins.