J. Pereira (1804-53), a British physician, questioned Liebig's assumptions that protein and energy-yielding nutrients combined with a few minerals represented an adequate diet. Diets that lacked variety were implicated in occurrences of scurvy. "But it wasn't until the second decade of the twentieth century that Liebig's concept of a nutritionally adequate diet was generally acknowledged to be untenable."
Harper, A.E. (2000) Recommended Dietary Allowances and Dietary Guidance. Cambridge World History of Food. Cambridge University Press.