She also notes that the amino acids found in complementary proteins
work together overall, and they need to be consumed in the same day, but they do not need to be consumed together at the same meal, as was previously believed.
According to the American Dietetic Association, "Research indicates that an assortment of plant foods eaten over the course of a day can provide all essential amino acids and ensure adequate nitrogen retention and use in healthy adults, thus complementary proteins
do not need to be consumed at the same meal." Young and Pellett believe "that for usual conditions of healthy living it is not necessary to consume complementary proteins
at the same time and that separation of the proteins among meals over the course of a day would still permit the nutritional benefits of complementation." (20) In a letter to Circulation, John A.