It is recommended to eat a variety of unrefined grains, legumes, seeds, nuts, and vegetables throughout the day, so that if one food is low in a particular essential amino acid, another food will make up this deficit…As an extreme example, even if you only ate one kind of grain, bean, potato, or vegetable as a protein source, and ate enough of that food, you could meet your protein and amino acid needs. Admittedly, it would be a very monotonous way to eat and you might miss out on other nutrients. We point this out, however, to illustrate the idea that almost all non-animal protein sources contain all of the essential amino acids.
