13 Sep 2007
In cereals, millets and similar grains, Lysine and Threonine are the "limiting" amino acids. This means they exist in smaller quantities and not in proper balance. Corn is deficient in Tryptophan. Legume products are deficient in sulfur amino acids and Tryptophan. Nuts and oil seeds as well as soybean proteins are poor in Methionine. Sunflower seed lack Lysine.
Peanut proteins (supposed to be one of the most complete foods) are deficient in Lysine, Methionine and Threonine. Green peas are a poor source of Methionine. Green leafy vegetables are a good source of proteins except for Methionine.