 In 1954, Adelle Davis published "Let's Eat Right to Keep Fit", which described the importance of combining "incomplete" proteins to make "complete" proteins, and advised that any incomplete proteins not complemented within one hour could not be used by the body.In 1971, Frances Moore Lappé published "Diet for a Small Planet", which explained how essential amino acids might be obtained from complementary sources in vegetarian nutrition.The book became a bestseller