Flexi Says: Essential amino acids cannot be made by the body. The nine essential amino acids are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. A person with a vegetarian or vegan diet needs to make sure they have an adequate supply of these essential amino acids. Certain combinations of food, such as corn and beans, or soybeans and rice, contain the essential amino acids in adequate amounts.
