Your body is sort of like a recycling bin. Let's take this amino acid talk a bit further. However, that means nine cannot be manufactured. You cannot function without each and every amino acid. Therefore, they are appropriately called essential amino acids.
Complete proteins contain ample amounts of all essential amino acids.
Gelatin is the only animal protein that is not considered a complete protein. That's not such a big deal. You already know that grains and legumes are rich in complex carbohydrate and fiber. You see, the foods in one column may be missing amino acids that are present in the foods listed in another column. You can combine the following vegetable proteins to make complete proteins.