A complete protein is a food source of protein that contains all nine essential amino acids necessary in the human diet. Essential amino acids are those that the human body cannot produce on its own, so they must be obtained through the foods we eat. Animal proteins, such as meat, poultry, fish, eggs, and dairy, are complete proteins. Some plant-based sources of complete protein include quinoa, buckwheat, hempseed, blue-green algae, and soybeans. Incomplete proteins, on the other hand, contain some, but not all, of the essential amino acids, and in various amounts. Examples of incomplete proteins include nuts, seeds, whole grains, vegetables, and legumes. However, vegetarians and vegans can still obtain complete proteins by combining incomplete, plant-based proteins. For example, nuts or seeds can be combined with whole grains, or whole grains can be combined with beans. It is important to consume enough protein in your diet, and to ensure that you are getting the right type of protein.