Protein Complimentarity
When two incomplete protein foods are eaten together to create a complete protein, it is called protein complimentarity. It is also important to note that there is a cellular storage pool that the body can access if necessary. This allows some time to pass before an incomplete protein diet begins to have negative ramifications, as well as to allow protein complimentarity to happen over the course of several meals.
A great example of protein complimentarity is combining grains and beans (legumes) to create a complete protein meal. A common combination would be brown rice and kidney beans. A person eating a diet consistently deficient in complete proteins will eventually incur a protein deficiency disease symptomatic of the specific missing protein.