THE NEWER KNOWLEDGE OF NUTRITION

Elmer Verner McCollum (March 3, 1879 – November 15, 1967) was an American biochemist known for his work on the influence of diet on health.[2][3] McCollum is also remembered for starting the first rat colony in the United States to be used for nutrition research. His reputation has suffered from posthumous controversy. Time magazine called him Dr. Vitamin.[4] His rule was, "Eat what you want after you have eaten what you should."[5] Living at a time when vitamins were unknown, he asked and tried to answer the questions, "How many dietary essentials are there, and what are they?"[3] He and Marguerite Davis discovered the first vitamin, named A, in 1913. McCollum also helped to discover vitamin B and vitamin D and worked out the effect of trace elements in the diet. As a worker in Wisconsin and later at Johns Hopkins, McCollum acted partly at the request of the dairy industry. When he said that milk was "the greatest of all protective foods", milk consumption in the United States d