After writing a promotional pamphlet for a milk company in 1932, she wrote two non-published treatises: "Optimum Health" (1935) and "You Can Stay Well" (1939). In 1942 Davis wrote a 524-page, forty-one chapter nutrition textbook for Macmillan, "Vitality Through Planned Nutrition." But she received public acclaim with her subsequent books written for the general public: "Let's Cook it Right" (1947); "Let's Have Healthy Children" (1951); "Let's Eat Right to Keep Fit" (1954); and "Let's Get Well" (1965). By 1974, when she died, her books had sold over 10 million copies.