Abstract
In the early years of the 20th century, the number of researchers engaged in nutritional work expanded enormously. Space does not permit more than an introduction to the proliferation of literature on any specific topic and it has unfortunately not been possible to fully distribute the credit to several groups of researchers working on the same problem. Also I have probably not given a due share to those publishing in languages other than English. When a development has been presented in a series of papers, I have tried to cite a relatively recent one because it is easier for readers to work their way back through the literature than try to go forward.

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